abstract syntax tree - Page 466

C++ Optimize if/else condition

- by Heye

I have a single line of code, that consumes 25% - 30% of the runtime of my application. It is a less-than comparator for an std::set (the set is implemented with a Red-Black-Tree). It is called about 180 Million times within 52 seconds. struct Entry { const float _cost; const long _id; // some other vars Entry(float cost, float id) : _cost(cost), _id(id) { } }; template<class T> struct lt_entry: public binary_function <T, T, bool> { bool operator()(const T &l, const T &r) const { // Most readable shape if(l._cost != r._cost) { return r._cost < l._cost; } else { return l._id < r._id; } } }; The entries should be sorted by cost and if the cost is the same by their id. I have many insertions for each extraction of the minimum. I thought about using Fibonacci-Heaps, but I have been told that they are theoretically nice, but suffer from high constants and are pretty complicated to implement. And since insert is in O(log(n)) the runtime increase is nearly constant with large n. So I think its okay to stick to the set. To improve performance I tried to express it in different shapes: return l._cost < r._cost || r._cost > l._cost || l._id < r._id; return l._cost < r._cost || (l._cost == r._cost && l._id < r._id); Even this: typedef union { float _f; int _i; } flint; //... flint diff; diff._f = (l._cost - r._cost); return (diff._i && diff._i >> 31) || l._id < r._id; But the compiler seems to be smart enough already, because I haven't been able to improve the runtime. I also thought about SSE but this problem is really not very applicable for SSE... The assembly looks somewhat like this: movss (%rbx),%xmm1 mov $0x1,%r8d movss 0x20(%rdx),%xmm0 ucomiss %xmm1,%xmm0 ja 0x410600 <_ZNSt8_Rb_tree[..]+96> ucomiss %xmm0,%xmm1 jp 0x4105fd <_ZNSt8_Rb_[..]_+93> jne 0x4105fd <_ZNSt8_Rb_[..]_+93> mov 0x28(%rdx),%rax cmp %rax,0x8(%rbx) jb 0x410600 <_ZNSt8_Rb_[..]_+96> xor %r8d,%r8d I have a very tiny bit experience with assembly language, but not really much. I thought it would be the best (only?) point to squeeze out some performance, but is it really worth the effort? Can you see any shortcuts that could save some cycles? The platform the code will run on is an ubuntu 12 with gcc 4.6 (-stl=c++0x) on a many-core intel machine. Only libraries available are boost, openmp and tbb. I am really stuck on this one, it seems so simple, but takes that much time. I have been crunching my head since days thinking how I could improve this line... Can you give me a suggestion how to improve this part, or is it already at its best?

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Problem with incomplete type while trying to detect existence of a member function

- by abir

I was trying to detect existence of a member function for a class where the function tries to use an incomplete type. The typedef is struct foo; typedef std::allocator<foo> foo_alloc; The detection code is struct has_alloc { template<typename U,U x> struct dummy; template<typename U> static char check(dummy<void* (U::*)(std::size_t),&U::allocate>*); template<typename U> static char (&check(...))[2]; const static bool value = (sizeof(check<foo_alloc>(0)) == 1); }; So far I was using incomplete type foo with std::allocator without any error on VS2008. However when I replaced it with nearly an identical implementation as template<typename T> struct allocator { T* allocate(std::size_t n) { return (T*)operator new (sizeof(T)*n); } }; it gives an error saying that as T is incomplete type it has problem instantiating allocator<foo> because allocate uses sizeof. GCC 4.5 with std::allocator also gives the error, so it seems during detection process the class need to be completely instantiated, even when I am not using that function at all. What I was looking for is void* allocate(std::size_t) which is different from T* allocate(std::size_t). My questions are (I have three questions, but as they are correlated , so I thought it is better not to create three separate questions). Why MS std::allocator doesn't check for incomplete type foo while instantiating? Are they following any trick which can be implemented ? Why the compiler need to instantiate allocator<T> to check the existence of the function when sizeof is not used as sfinae mechanism to remove/add allocate in the overload resolutions set? It should be noted that, if I remove the generic implementation of allocate leaving the declaration only, and specialized it for foo afterwards such as struct foo{}; template< struct allocator { foo* allocate(std::size_t n) { return (foo*)operator new (sizeof(foo)*n); } }; after struct has_alloc it compiles in GCC 4.5 while gives error in VS2008 as allocator<T> is already instantiated and explicit specialization for allocator<foo> already defined. Is it legal to use nested types for an std::allocator of incomplete type such as typedef foo_alloc::pointer foo_pointer; ? Though it is practically working for me, I suspect the nested types such as pointer may depend on completeness of type it takes. It will be good to know if there is any possible way to typedef such types as foo_pointer where the type pointer depends on completeness of foo. NOTE : As the code is not copy paste from editor, it may have some syntax error. Will correct it if I find any. Also the codes (such as allocator) are not complete implementation, I simplified and typed only the portion which I think useful for this particular problem.

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Infinite sharing system (PHP/MySQLi)

- by Toine Lille

I'm working on a discount system for whichever customer shares a product and brings in new customers. Each unique visit = $0.05 off, each new customer = $0.50 off (it's a cheap product so yeah, no big numbers). When a new customer shares the site, the customer initially responsible for the new customer (if any) will get half of the new customer's discount as well. The initial customer would get a fourth for the next level and the new customer half of that, etc, creating a tree or pyramid that way that could be infinite. Initial customer ($1.35 discount: 2 new+3 visits + half of 1 new+2 visits) Visitor ($0) Visitor ($0) New customer ($0.60) Visitor ($0) Visitor ($0) Newer customer ($0) New customer ($0) Visitor ($0) The customers are saved along with their IP addresses (bin2hex(inet_pton)) in a database table (customers) with info like a unique id, e-mail address and first date/time the purchased a product (= time of registration). The shares are saved in a separate table within the same database (sharing). Each unique IP addresses that visits the site creates a new row featuring the IP address (also saved as bin2hex(inet_pton)), the id of the customer who shared it and the date/time of the visit. Sharing goes via URL, featuring a GET element containing the customer's id. Visits and new customers overlap, as visits will always occur before the new customer does. That's fine. The date/times are used just to make it a little more secure (I also use the IP along with cookies to see if people cheat the system). If an IP is already in the sharing or customer tables, it does not count and will not create a new entry. Now the problem is, how to make the infinity happen and apply the different values to it? That's all I'd need to know. It needs to calculate the discount for each customer separately, but also allow for monitoring altogether (though that's just a matter of passing all ID's through it). I figured I'd start (after the database connection) with $stmt = $con->prepare('SELECT ip,datetime FROM sharing WHERE sender=?'); $stmt->bind_param('i',$customerid); $stmt->execute(); $stmt->store_result(); $discount = $discount + ($stmt->num_rows * 0.05); $stmt->bind_result($ip,$timeofsharing); to translate all the visits to $0.05 of discount each. To check for the new customers that came from these visits, I wrote the following: while ($sql->fetch()) { $stmt2 = $con->prepare("SELECT datetime FROM users WHERE ip=?"); $stmt2->bind_param('s',$ip); $stmt2->execute(); $stmt2->store_result(); $stmt2->bind_result($timeofpurchase); Followed by a little more security comparing the datetimes: while ($stmt2->fetch()) { if (strtotime($timeofpurchase) < strtotime($timeofsharing)) { $discount = $discount + $0.50; } But this is just for the initial customer's direct results. If I'd want to check for the next level, I'd basically have to put the exact same check and loop in itself, checking each new customer the initial customer they brought to the site, and then for the next level again to check all of the newer customers, etc, etc. What to do? / Where to go? / What would be the correct practice for this? Thanks!

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Binary operator overloading on a templated class (C++)

- by GRB

Hi all, I was recently trying to gauge my operator overloading/template abilities and as a small test, created the Container class below. While this code compiles fine and works correctly under MSVC 2008 (displays 11), both MinGW/GCC and Comeau choke on the operator+ overload. As I trust them more than MSVC, I'm trying to figure out what I'm doing wrong. Here is the code: #include <iostream> using namespace std; template <typename T> class Container { friend Container<T> operator+ <> (Container<T>& lhs, Container<T>& rhs); public: void setobj(T ob); T getobj(); private: T obj; }; template <typename T> void Container<T>::setobj(T ob) { obj = ob; } template <typename T> T Container<T>::getobj() { return obj; } template <typename T> Container<T> operator+ <> (Container<T>& lhs, Container<T>& rhs) { Container<T> temp; temp.obj = lhs.obj + rhs.obj; return temp; } int main() { Container<int> a, b; a.setobj(5); b.setobj(6); Container<int> c = a + b; cout << c.getobj() << endl; return 0; } This is the error Comeau gives: Comeau C/C++ 4.3.10.1 (Oct 6 2008 11:28:09) for ONLINE_EVALUATION_BETA2 Copyright 1988-2008 Comeau Computing. All rights reserved. MODE:strict errors C++ C++0x_extensions "ComeauTest.c", line 27: error: an explicit template argument list is not allowed on this declaration Container<T> operator+ <> (Container<T>& lhs, Container<T>& rhs) ^ 1 error detected in the compilation of "ComeauTest.c". I'm having a hard time trying to get Comeau/MingGW to play ball, so that's where I turn to you guys. It's been a long time since my brain has melted this much under the weight of C++ syntax, so I feel a little embarrassed ;). Thanks in advance. EDIT: Eliminated an (irrelevant) lvalue error listed in initial Comeau dump.

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Many-to-one relation exception due to closed session after loading

- by Nick Thissen

Hi, I am using NHibernate (version 1.2.1) for the first time so I wrote a simple test application (an ASP.NET project) that uses it. In my database I have two tables: Persons and Categories. Each person gets one category, seems easy enough. | Persons | | Categories | |--------------| |--------------| | Id (PK) | | Id (PK) | | Firstname | | CategoryName | | Lastname | | CreatedTime | | CategoryId | | UpdatedTime | | CreatedTime | | Deleted | | UpdatedTime | | Deleted | The Id, CreatedTime, UpdatedTime and Deleted attributes are a convention I use in all my tables, so I have tried to bring this fact into an additional abstraction layer. I have a project DatabaseFramework which has three important classes: Entity: an abstract class that defines these four properties. All 'entity objects' (in this case Person and Category) must inherit Entity. IEntityManager: a generic interface (type parameter as Entity) that defines methods like Load, Insert, Update, etc. NHibernateEntityManager: an implementation of this interface using NHibernate to do the loading, saving, etc. Now, the Person and Category classes are straightforward, they just define the attributes of the tables of course (keeping in mind that four of them are in the base Entity class). Since the Persons table is related to the Categories table via the CategoryId attribute, the Person class has a Category property that holds the related category. However, in my webpage, I will also need the name of this category (CategoryName), for databinding purposes for example. So I created an additional property CategoryName that returns the CategoryName property of the current Category property, or an empty string if the Category is null: Namespace Database Public Class Person Inherits DatabaseFramework.Entity Public Overridable Property Firstname As String Public Overridable Property Lastname As String Public Overridable Property Category As Category Public Overridable ReadOnly Property CategoryName As String Get Return If(Me.Category Is Nothing, _ String.Empty, _ Me.Category.CategoryName) End Get End Property End Class End Namespace I am mapping the Person class using this mapping file. The many-to-one relation was suggested by Yads in another thread: <id name="Id" column="Id" type="int" unsaved-value="0"> <generator class="identity" /> </id> <property name="CreatedTime" type="DateTime" not-null="true" /> <property name="UpdatedTime" type="DateTime" not-null="true" /> <property name="Deleted" type="Boolean" not-null="true" /> <property name="Firstname" type="String" /> <property name="Lastname" type="String" /> <many-to-one name="Category" column="CategoryId" class="NHibernateWebTest.Database.Category, NHibernateWebTest" /> (I can't get it to show the root node, this forum hides it, I don't know how to escape the html-like tags...) The final important detail is the Load method of the NHibernateEntityManager implementation. (This is in C# as it's in a different project, sorry about that). I simply open a new ISession (ISessionFactory.OpenSession) in the GetSession method and then use that to fill an EntityCollection(Of TEntity) which is just a collection inheriting System.Collections.ObjectModel.Collection(Of T). public virtual EntityCollection< TEntity Load() { using (ISession session = this.GetSession()) { var entities = session .CreateCriteria(typeof (TEntity)) .Add(Expression.Eq("Deleted", false)) .List< TEntity (); return new EntityCollection< TEntity (entities); } } (Again, I can't get it to format the code correctly, it hides the generic type parameters, probably because it reads the angled symbols as a HTML tag..? If you know how to let me do that, let me know!) Now, the idea of this Load method is that I get a fully functional collection of Persons, all their properties set to the correct values (including the Category property, and thus, the CategoryName property should return the correct name). However, it seems that is not the case. When I try to data-bind the result of this Load method to a GridView in ASP.NET, it tells me this: Property accessor 'CategoryName' on object 'NHibernateWebTest.Database.Person' threw the following exception:'Could not initialize proxy - the owning Session was closed.' The exception occurs on the DataBind method call here: public virtual void LoadGrid() { if (this.Grid == null) return; this.Grid.DataSource = this.Manager.Load(); this.Grid.DataBind(); } Well, of course the session is closed, I closed it via the using block. Isn't that the correct approach, should I keep the session open? And for how long? Can I close it after the DataBind method has been run? In each case, I'd really like my Load method to just return a functional collection of items. It seems to me that it is now only getting the Category when it is required (eg, when the GridView wants to read the CategoryName, which wants to read the Category property), but at that time the session is closed. Is that reasoning correct? How do I stop this behavior? Or shouldn't I? And what should I do otherwise? Thanks!

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No Hibernate Session bound to thread exception

- by Benchik

I have Hibernate 3.6.0.Final and Spring 3.0.0.RELEASE I get "No Hibernate Session bound to thread, and configuration does not allow creation of non-transactional one here" If I add the thread specification back in, I get "saveOrUpdate is not valid without active transaction" Any ideas? The spring-config.xml: <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close"> <property name="driverClassName" value="org.hsqldb.jdbcDriver"/> <property name="url" value="jdbc:hsqldb:mem:jsf2demo"/> <property name="username" value="sa"/> <property name="password" value=""/> </bean> <bean id="sampleSessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean"> <property name="dataSource" ref="sampleDataSource"/> <property name="annotatedClasses"> <list> <value>com.maxheapsize.jsf2demo.Book</value> </list> </property> <property name="hibernateProperties"> <props>  <prop key="hibernate.show_sql">true</prop> <prop key="hibernate.dialect">org.hibernate.dialect.HSQLDialect</prop>  <prop key="hibernate.hbm2ddl.auto">create</prop> </props> </property> </bean> <bean id="sampleDataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"> <property name="driverClassName"> <value>org.hsqldb.jdbcDriver</value> </property> <property name="url"> <value> jdbc:hsqldb:file:/spring/db/springdb;SHUTDOWN=true </value> </property> <property name="username" value="sa"/> <property name="password" value=""/> </bean> <bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager"> <property name="sessionFactory" ref="sampleSessionFactory"/> </bean> <bean id="daoTxTemplate" abstract="true" class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean"> <property name="transactionManager" ref="transactionManager"/> <property name="transactionAttributes"> <props> <prop key="create*"> PROPAGATION_REQUIRED,ISOLATION_READ_COMMITTED </prop> <prop key="get*"> PROPAGATION_REQUIRED,ISOLATION_READ_COMMITTED </prop> </props> </property> </bean> <bean name="openSessionInViewInterceptor" class="org.springframework.orm.hibernate3.support.OpenSessionInViewInterceptor"> <property name="sessionFactory" ref="sampleSessionFactory"/> <property name="singleSession" value="true"/> </bean> <bean id="nameDao" parent="daoTxTemplate"> <property name="target"> <bean class="com.maxheapsize.dao.NameDao"> <property name="sessionFactory" ref="sampleSessionFactory"/> </bean> </property> </bean> and the DAO: public class NameDao { private SessionFactory sessionFactory; public void setSessionFactory(SessionFactory sessionFactory) { this.sessionFactory = sessionFactory; } public SessionFactory getSessionFactory() { return sessionFactory; } @Transactional @SuppressWarnings("unchecked") public List<Name> getAll() { Session session = this.sessionFactory.getCurrentSession(); List<Name> names = (List<Name>)session.createQuery("from Name").list(); return names; } //@Transactional(propagation= Propagation.REQUIRED, readOnly=false) @Transactional public void save(Name name){ Session session = this.sessionFactory.getCurrentSession(); session.saveOrUpdate(name); session.flush(); } }

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Why is SQLite3 using covering indices instead of the indices I created?

- by Geoff

I have an extremely large database (contacts has ~3 billion entries, people has ~280 million entries, and the other tables have a negligible number of entries). Most other queries I've run are really fast. However, I've encountered a more complicated query that's really slow. I'm wondering if there's any way to speed this up. First of all, here is my schema: CREATE TABLE activities (id INTEGER PRIMARY KEY, name TEXT NOT NULL); CREATE TABLE contacts ( id INTEGER PRIMARY KEY, person1_id INTEGER NOT NULL, person2_id INTEGER NOT NULL, duration REAL NOT NULL, -- hours activity_id INTEGER NOT NULL -- FOREIGN_KEY(person1_id) REFERENCES people(id), -- FOREIGN_KEY(person2_id) REFERENCES people(id) ); CREATE TABLE people ( id INTEGER PRIMARY KEY, state_id INTEGER NOT NULL, county_id INTEGER NOT NULL, age INTEGER NOT NULL, gender TEXT NOT NULL, -- M or F income INTEGER NOT NULL -- FOREIGN_KEY(state_id) REFERENCES states(id) ); CREATE TABLE states ( id INTEGER PRIMARY KEY, name TEXT NOT NULL, abbreviation TEXT NOT NULL ); CREATE INDEX activities_name_index on activities(name); CREATE INDEX contacts_activity_id_index on contacts(activity_id); CREATE INDEX contacts_duration_index on contacts(duration); CREATE INDEX contacts_person1_id_index on contacts(person1_id); CREATE INDEX contacts_person2_id_index on contacts(person2_id); CREATE INDEX people_age_index on people(age); CREATE INDEX people_county_id_index on people(county_id); CREATE INDEX people_gender_index on people(gender); CREATE INDEX people_income_index on people(income); CREATE INDEX people_state_id_index on people(state_id); CREATE INDEX states_abbreviation_index on states(abbreviation); CREATE INDEX states_name_index on states(name); Note that I've created an index on every column in the database. I don't care about the size of the database; speed is all I care about. Here's an example of a query that, as expected, runs almost instantly: SELECT count(*) FROM people, states WHERE people.state_id=states.id and states.abbreviation='IA'; Here's the troublesome query: SELECT * FROM contacts WHERE rowid IN (SELECT contacts.rowid FROM contacts, people, states WHERE contacts.person1_id=people.id AND people.state_id=states.id AND states.name='Kansas' INTERSECT SELECT contacts.rowid FROM contacts, people, states WHERE contacts.person2_id=people.id AND people.state_id=states.id AND states.name='Missouri'); Now, what I think would happen is that each subquery would use each relevant index I've created to speed this up. However, when I show the query plan, I see this: sqlite> EXPLAIN QUERY PLAN SELECT * FROM contacts WHERE rowid IN (SELECT contacts.rowid FROM contacts, people, states WHERE contacts.person1_id=people.id AND people.state_id=states.id AND states.name='Kansas' INTERSECT SELECT contacts.rowid FROM contacts, people, states WHERE contacts.person2_id=people.id AND people.state_id=states.id AND states.name='Missouri'); 0|0|0|SEARCH TABLE contacts USING INTEGER PRIMARY KEY (rowid=?) (~25 rows) 0|0|0|EXECUTE LIST SUBQUERY 1 2|0|2|SEARCH TABLE states USING COVERING INDEX states_name_index (name=?) (~1 rows) 2|1|1|SEARCH TABLE people USING COVERING INDEX people_state_id_index (state_id=?) (~5569556 rows) 2|2|0|SEARCH TABLE contacts USING COVERING INDEX contacts_person1_id_index (person1_id=?) (~12 rows) 3|0|2|SEARCH TABLE states USING COVERING INDEX states_name_index (name=?) (~1 rows) 3|1|1|SEARCH TABLE people USING COVERING INDEX people_state_id_index (state_id=?) (~5569556 rows) 3|2|0|SEARCH TABLE contacts USING COVERING INDEX contacts_person2_id_index (person2_id=?) (~12 rows) 1|0|0|COMPOUND SUBQUERIES 2 AND 3 USING TEMP B-TREE (INTERSECT) In fact, if I show the query plan for the first query I posted, I get this: sqlite> EXPLAIN QUERY PLAN SELECT count(*) FROM people, states WHERE people.state_id=states.id and states.abbreviation='IA'; 0|0|1|SEARCH TABLE states USING COVERING INDEX states_abbreviation_index (abbreviation=?) (~1 rows) 0|1|0|SEARCH TABLE people USING COVERING INDEX people_state_id_index (state_id=?) (~5569556 rows) Why is SQLite using covering indices instead of the indices I created? Shouldn't the search in the people table be able to happen in log(n) time given state_id which in turn is found in log(n) time?

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Reordering Variadic Parameters

- by void-pointer

I have come across the need to reorder a variadic list of parameters that is supplied to the constructor of a struct. After being reordered based on their types, the parameters will be stored as a tuple. My question is how this can be done so that a modern C++ compiler (e.g. g++-4.7) will not generate unnecessary load or store instructions. That is, when the constructor is invoked with a list of parameters of variable size, it efficiently pushes each parameter into place based on an ordering over the parameters' types. Here is a concrete example. Assume that the base type of every parameter (without references, rvalue references, pointers, or qualifiers) is either char, int, or float. How can I make it so that all the parameters of base type char appear first, followed by all of those of base type int (which leaves the parameters of base type float last). The relative order in which the parameters were given should not be violated within sublists of homogeneous base type. Example: foo::foo() is called with arguments float a, char&& b, const float& c, int&& d, char e. The tuple tupe is std::tuple<char, char, int, float, float>, and it is constructed like so: tuple_type{std::move(b), e, std::move(d), a, c}. Consider the struct defined below, and assume that the metafunction deduce_reordered_tuple_type is already implemented. How would you write the constructor so that it works as intended? If you think that the code for deduce_reodered_tuple_type, would be useful to you, I can provide it; it's a little long. template <class... Args> struct foo { // Assume that the metafunction deduce_reordered_tuple_type is defined. typedef typename deduce_reordered_tuple_type<Args...>::type tuple_type; tuple_type t_; foo(Args&&... args) : t_{reorder_and_forward_parameters<Args>(args)...} {} }; Edit 1 The technique I describe above does have applications in mathematical frameworks that make heavy use of expression templates, variadic templates, and metaprogramming in order to perform aggressive inlining. Suppose that you wish to define an operator that takes the product of several expressions, each of which may be passed by reference, reference to const, or rvalue reference. (In my case, the expressions are conditional probability tables and the operation is the factor product, but something like matrix multiplication works suitably as well.) You need access to the data provided by each expression in order to evaluate the product. Consequently, you must move the expressions passed as rvalue references, copy the expressions passed by reference to const, and take the addresses of expressions passed by reference. Using the technique I describe above now poses several benefits. Other expressions can use uniform syntax to access data elements from this expression, since all of the heavy-lifting metaprogramming work is done beforehand, within the class. We can save stack space by grouping the pointers together and storing the larger expressions towards the end of the tuple. Implementing certain types of queries becomes much easier (e.g. check whether any of the pointers stored in the tuple aliases a given pointer). Thank you very much for your help!

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What's the fastest lookup algorithm for a pair data structure (i.e, a map)?

- by truncheon

In the following example a std::map structure is filled with 26 values from A - Z (for key) and 0 – 26 for value. The time taken (on my system) to lookup the last entry (10000000 times) is roughly 250 ms for the vector, and 125 ms for the map. (I compiled using release mode, with O3 option turned on for g++ 4.4) But if for some odd reason I wanted better performance than the std::map, what data structures and functions would I need to consider using? I apologize if the answer seems obvious to you, but I haven't had much experience in the performance critical aspects of C++ programming. UPDATE: This example is rather trivial and hides the true complexity of what I'm trying to achieve. My real world project is a simple scripting language that uses a parser, data tree, and interpreter (instead of a VM stack system). I need to use some kind of data structure (perhaps map) to store the variables names created by script programmers. These are likely to be pretty randomly named, so I need a lookup method that can quickly find a particular key within a (probably) fairly large list of names. #include <ctime> #include <map> #include <vector> #include <iostream> struct mystruct { char key; int value; mystruct(char k = 0, int v = 0) : key(k), value(v) { } }; int find(const std::vector<mystruct>& ref, char key) { for (std::vector<mystruct>::const_iterator i = ref.begin(); i != ref.end(); ++i) if (i->key == key) return i->value; return -1; } int main() { std::map<char, int> mymap; std::vector<mystruct> myvec; for (int i = 'a'; i < 'a' + 26; ++i) { mymap[i] = i - 'a'; myvec.push_back(mystruct(i, i - 'a')); } int pre = clock(); for (int i = 0; i < 10000000; ++i) { find(myvec, 'z'); } std::cout << "linear scan: milli " << clock() - pre << "\n"; pre = clock(); for (int i = 0; i < 10000000; ++i) { mymap['z']; } std::cout << "map scan: milli " << clock() - pre << "\n"; return 0; }

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show hidden div tag from another page

- by neueweblernen

I'm trying to link to an all-inclusive FAQ page from various pages. The answers are contained in tags, nested within a line item of an unordered list housed by categories. The FAQ page has the following categories: Practical Nurse Exam Online Renewal Practice Hours etc. Under Practical Nurse Exam, there are sub categories, subjects, with questions below in tags that expand onClick. (e.g. Examination Day, Exam Results, etc.) Let's say I'm on a different page called Registration and there's a link to the FAQs for Exam Results. I'm able to link to the page and included the hashtag on the anchor or Exam Results, but it does not expand the subcategory. I've read this thread but it didn't work for me. Please help! The code is below: <script type="text/javascript"> function toggle(Info,pic) { var CState = document.getElementById(Info); CState.style.display = (CState.style.display != 'block') ? 'block' : 'none'; } window.onload = function() { var hash = window.location.hash; // would be "#div1" or something if(hash != "") { var id = hash.substr(1); // get rid of # document.getElementById(id).style.display = 'block'; } } </script> <style type="text/css"> .FAQ { cursor:hand; cursor:pointer; } .FAA { display:none; padding-left:20px; text-indent:-20px; } #FAQlist li { list-style-type: none; } #FAQlist ul { margin-left:0px; } headingOne{ font-family:Arial, Helvetica, sans-serif; color:#66BBFF; font-size:20px; font-weight:bold;} </style> Here's the body (part of it anyway) <headingOne class="FAQ" onClick="toggle('CPNRE', this)">PRACTICAL NURSE EXAM</headingOne> <div class="FAA" id="CPNRE"> <h3><a name="applying">Applying to write the CPNRE</a></h3> <ul id="FAQlist" style="width:450px;"> <li class="FAQ"> <p onclick="toggle('faq1',this)"> <strong>Q: How much does it cost to write the exam?</strong></p> <div class="FAA" id="faq1"> <b>A.</b> In 2013, the cost for the first exam writing is $600.00 which includes the interim license fee. See <a href="https://www.clpnbc.org/What-is-an-LPN/Becoming-an-LPN/Canadian-Practical-Nurse-Registration-Examination/Fees-and-Deadlines.aspx"> fee schedule</a>.</div> <hr /> </li> and here's the body of the other page that contains the link and the same script syntax as the all-inclusive FAQ page. This is just a test, that's not exactly what it will say: <a onclick="toggle('CPNRE', this)" href="file:///S|/Designs/Web stuff/FAQ all inclusive.html#applying"> click here</a>

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antlr line after line processing

- by pawloch

I'm writing simple language in ANTLR, and I'd like to write shell where I can put line of code, hit ENTER and have it executed, enter another line, and have it executed. I have already written grammar which execute all alines of input at one. Example input: int a,b,c; string d; string e; d=\"dziala\"; a=4+7; b=a+33; c=(b/11)*2; grammar Kalkulator; options { language = Java; output=AST; ASTLabelType=CommonTree; } tokens { NEG; } @header { package lab4; } @lexer::header { package lab4; } line : (assignment | declaration)* EOF ; declaration : type^ IDENT (','! IDENT)* ';'! ; type : 'int' | 'string' ; assignment : IDENT '='^ expression ';'! ; term : IDENT | INTEGER | STRING_LITERAL | '('! expression ')'! ; unary : (( negation^ | '+'! ))* term ; negation : '-' -> NEG ; mult : unary ( ('*'^ | '/'^) unary )* ; exp2 :mult ( ('-'^ | '+'^) mult)* ; expression : exp2 ('&'^ exp2)* ; fragment LETTER : ('a'..'z'|'A'..'Z'); fragment DIGIT : '0'..'9'; INTEGER : DIGIT+; IDENT : LETTER (LETTER | DIGIT)* ; WS : (' ' | '\t' | '\n' | '\r' | '\f')+ {$channel=HIDDEN;}; STRING_LITERAL : '\"' .* '\"'; and: tree grammar Evaluator; options { language = Java; tokenVocab = Kalkulator; ASTLabelType = CommonTree; } @header { package lab4; import java.util.Map; import java.util.HashMap; } @members { private Map<String, Object> zmienne = new HashMap<String, Object>(); } line returns [Object result] : (declaration | assignment { result = $assignment.result; })* EOF ; declaration : ^(type ( IDENT { if("string".equals($type.result)){ zmienne.put($IDENT.text,""); //add definition } else{ zmienne.put($IDENT.text,0); //add definition } System.out.println($type.result + " " + $IDENT.text);//write output } )* ) ; assignment returns [Object result] : ^('=' IDENT e=expression) { if(zmienne.containsKey($IDENT.text)) {zmienne.put($IDENT.text, e); result = e; System.out.println(e); } else{ System.out.println("Blad: Niezadeklarowana zmienna"); } } ; type returns [Object result] : 'int' {result="int";}| 'string' {result="string";} ; expression returns [Object result] : ^('+' op1=expression op2=expression) { result = (Integer)op1 + (Integer)op2; } | ^('-' op1=expression op2=expression) { result = (Integer)op1 - (Integer)op2; } | ^('*' op1=expression op2=expression) { result = (Integer)op1 * (Integer)op2; } | ^('/' op1=expression op2=expression) { result = (Integer)op1 / (Integer)op2; } | ^('%' op1=expression op2=expression) { result = (Integer)op1 \% (Integer)op2; } | ^('&' op1=expression op2=expression) { result = (String)op1 + (String)op2; } | ^(NEG e=expression) { result = -(Integer)e; } | IDENT { result = zmienne.get($IDENT.text); } | INTEGER { result = Integer.parseInt($INTEGER.text); } | STRING_LITERAL { String t=$STRING_LITERAL.text; result = t.substring(1,t.length()-1); } ; Can I make it process line-by-line or is that easier to make it all again?

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Mapping integers to types using C++ template fails in a specific case

- by Shailesh Kumar

I am attempting to compile the following template based code in VC++ 2005. #include <iostream> using namespace std; /* * T is a template which maps an integer to a specific type. * The mapping happens through partial template specialization. * In the following T<1> is mapped to char, T<2> is mapped to long * and T<3> is mapped to float using partial template specializations */ template <int x> struct T { public: }; template<> struct T<1> { public: typedef char xType; }; template<> struct T<2> { public: typedef long xType; }; template<> struct T<3> { public: typedef float xType; }; // We can easily access the specific xType for a specific T<N> typedef T<3>::xType x3Type; /*! * In the following we are attempting to use T<N> inside another * template class T2<R> */ template<int r> struct T2 { //We can map T<r> to some other type T3 typedef T<r> T3; // The following line fails typedef T3::xType xType; }; int main() { T<1>::xType a1; cout << typeid(a1).name() << endl; T<2>::xType a2; cout << typeid(a2).name() << endl; T<3>::xType a3; cout << typeid(a3).name() << endl; return 0; } There is a particular line in the code which doesn't compile: typedef T3::xType xType; If I remove this line, compilation goes fine and the result is: char long float If I retain this line, compilation errors are observed. main.cpp(53) : warning C4346: 'T<x>::xType' : dependent name is not a type prefix with 'typename' to indicate a type main.cpp(54) : see reference to class template instantiation 'T2<r>' being compiled main.cpp(53) : error C2146: syntax error : missing ';' before identifier 'xType' main.cpp(53) : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int I am not able to figure out how to make sure that T::xType can be treated as a type inside the T2 template. Any help is highly appreciated.

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create previous next button for iframe pages

- by Resu

This topic may have lots of code out there, BUT I seem to be looking for a variation that isn't based on history, is it possible... So I have this code... <script type="text/javascript"> var pages=new Array(); pages[0]="listItem1.html"; pages[1]="listItem2.html"; pages[2]="listItem3.html"; pages[3]="listItem4.html"; pages[4]="listItem5.html"; var i=0; var end=pages.length; end--; function changeSrc(operation) { if (operation=="next") { if (i==end) { document.getElementById('the_iframe').src=pages[end]; i=0;} else { document.getElementById('the_iframe').src=pages[i]; i++;}} if (operation=="back") { if (i==0) { document.getElementById('the_iframe').src=pages[0]; i=end;} else { document.getElementById('the_iframe').src=pages[i]; i--;}}} </script> </head> <body> <ul id="menu" role="group"> <li><a href="listItem1.html" target="ifrm" role="treeitem">Welcome</a> <ul> <li><a href="listItem2.html" target="ifrm" role="treeitem">Ease of Access Center</a></li> </ul> </li> <li><a href="listItem3.html" target="ifrm">Getting Started</a> <ul> <li><a href="listItem4.html" target="ifrm">Considerations</a></li> <li><a href="listItem5.html" target="ifrm">Changing Perspective</a></li> </ul> </li> </ul> <iframe id="the_iframe" scrolling="no" src="listItem1.htm" name="ifrm" style="width:540px;></iframe> <input type="button" onClick="changeSrc('back');" value="Back" /> <input type="button" onClick="changeSrc('next');" value="Next" /> and if I click on the next or prev button, it does move somewhere,but... let's say my iframe is showing listItem2, then I click on listItem4 in the menu (there is a tree menu involved), then I want to go to listItem3 and I hit the back button...instead of going to listItem3, it goes to listItem2 (or someplace that is not back a page from 4 to 3). It appears that the buttons are navigating based on history?...but I just want a straight forward or backward movement...I don't want my buttons to have this browser-type functionality...If I'm on listItem4 and hit the next button, I want it to go to listItem5. Many Thanks For Any Help!

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What language/framework (technology) to use for website (flash games portal)

- by cripox

Hello, I know there are a lot of similar questions on the net, but because I am a newbie in web development I didn't find the solution for my specific problem. I am planing on creating a flash games portal from scratch. It is a big chance that there will be big traffic from the beginning (millions of pageviews). I want to reduce the server costs as much as possible but in the same time to not be tide to an expensive contract as there is a chance that the project will not be as successfully as I want and in that case the money would be very little. The question is : what technology to use? I don't know any web dev technology yet so it doesn't matter what I will learn. My web dev experience is a little php 8 years ago, and from then I programmed in C++ / Java- game and mobile development. I like Java and C syntax and language very much and I tend to dislike dynamic typing or non robust scripting (like php)- but I can get along if these are the best choices. The candidates are now: - Grails (my best for now) Ruby on Rails Cake PHP Other technologies (Google App Engine, Python/Django etc...) I was considering at first using pure C and compiling the web app in the server- just to squeeze more from the servers, but soon I understand that this is overkill. Next my eyes came on Ruby - as there is a lot of buzz for it's easiness of use. Next I discovered Grails and looked at Java because it is said that it is "faster". But I don't know what this "Faster" really means on my needs, so here comes the first question: 1) What will be my biggest consumption on the server, other than bandwidth, for a lot of flash content requests? Is it memory? I heard that Java needs a lot of memory, but is faster. Is it CPU? I am planning to take some daily VPS.NET nodes at first, to see if there is a demand, and if the "spike" is permanent to move to a dedicated server (serverloft.com has some good offers), else to remain with less nodes. I was also considering developing in Google App Engine- cheap or free hosting to use at first - so I can test my assumption- and also very easy to use (no need for sys administration) but the costs became high if used more ( 3 million games played / month .. x mb/ each). And the issue with Google is that it looks me in this technology. My other concern is scalability (not only for traffic/users, but as adding functionality) My plans are to release a functional site in just 4 weeks (just the basics frontend and some quick basic backend - so I can be able to modify some things and add games manually) - but then to raise it and add more things to it. I am planning to take a little different approach than other portals so I need to write it from scratch (a script will not do). 2) Will Grails take much more resources than RoR or Php server wise? I heard that making it on Java stack will be hardware expensive and is overkill if you don't make a bank application. My application will not be very complex (I hope and i will try to) but will have a lot of traffic. I also took in account using CDN for files, but the cheapest CDN found was 5c/GB (vps.net) and the cost per gb on serverloft (http://www.serverloft.com/dedizierte-server/server-details.php?products=4) is only 1.79 cents/GB and comes with the other resources either. I am new to this domain (web). I am learning the ropes and searching on the web for ~half of year but don't have any really practical experience, so I know that I must have some naive thinking and other issues that i don't know from now, so please give me any advice you want regarding anything, not just the specific questions asked. And thank you so much for such great community!

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VBScript Multiple folder check if then statement

- by user2868186

I had this working before just fine with the exception of getting an error if one of the folders was not there, so I tried to fix it. Searched for a while (as much as I can at work) for a solution and tried different methods, still no luck and my IT tickets are stacking up at work, lol, woohoo. Thanks for any help provided. Getting syntax error on line 60 character 60, thanks again. Option Explicit Dim objFSO, Folder1, Folder2, Folder3, zipFile Dim ShellApp, zip, oFile, CurDate, MacAdd, objWMIService Dim MyTarget, MyHex, MyBinary, i, strComputer, objItem, FormatMAC Dim oShell, oCTF, CurDir, scriptPath, oRegEx, colItems Dim FoldPath1, FoldPath2, FoldPath3, foldPathArray Const FOF_SIMPLEPROGRESS = 256 'Grabs MAC from current machine strComputer = "." Set objWMIService = GetObject("winmgmts:\\" & strComputer & "\root\cimv2") Set colItems = objWMIService.ExecQuery _ ("Select * From Win32_NetworkAdapterConfiguration Where IPEnabled = True") For Each objItem in colItems MacAdd = objItem.MACAddress Next 'Finds the pattern of a MAC address then changes it for 'file naming purposes. You can change the FormatMAC line of the code 'in parenthesis where the periods are, to whatever you like 'as long as its within the standard file naming convention Set oRegEx = CreateObject("VBScript.RegExp") oRegEx.Pattern = "([\dA-F]{2}).?([\dA-F]{2}).?([\dA-F]" _ & "{2}).?([\dA-F]{2}).?([\dA-F]{2}).?([\dA-F]{2})" FormatMAC = oRegEx.Replace(MacAdd, "$1.$2.$3.$4.$5.$6") 'Gets current date in a format for file naming 'Periods can be replaced with anything that is standard to 'file naming convention CurDate = Month(Date) & "." & Day(Date) & "." & Year(Date) 'Gets path of the directory where the script is being ran from Set objFSO = CreateObject("Scripting.FileSystemObject") scriptPath = Wscript.ScriptFullName Set oFile = objFSO.GetFile(scriptPath) CurDir = objFSO.GetParentFolderName(oFile) 'where and what the zip file will be called/saved MyTarget = CurDir & "\" & "IRAP_LOGS_" & CurDate & "_" & FormatMAC & ".zip" 'Actual creation of the zip file MyHex = Array(80, 75, 5, 6, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0) For i = 0 To UBound(MyHex) MyBinary = MyBinary & Chr(MyHex(i)) Next Set oShell = CreateObject("WScript.Shell") Set oCTF = objFSO.CreateTextFile(MyTarget, True) oCTF.Write MyBinary oCTF.Close Set oCTF = Nothing wScript.Sleep(3000) folder1 = True folder2 = True folder3 = True 'Adds folders to the zip file created earlier 'change these folders to whatever is needing to be copied into the zip folder 'Folder1 If not objFSO.FolderExists("C:\Windows\Temp\SMSTSLog") and If not objFSO.FolderExists("X:\Windows\Temp\SMSTSLog") then Folder1 = false End If If objFSO.FolderExists("C:\Windows\Temp\SMSTSLog") Then Folder1 = "C:\Windows\Temp\SMSTSLog" Set FoldPath1 = objFSO.getFolder(Folder1) Else Folder1 = "X:\windows\Temp\SMSTSLog" Set FoldPath1 = objFSO.getFolder(Folder1) End If 'Folder2 If not objFSO.FolderExists("C:\Windows\System32\CCM\Logs") and If not objFSO.FolderExists("X:\Windows\System32\CCM\Logs") then Folder2 = false End If If objFSO.FolderEXists("C:\Windows\System32\CCM\Logs") Then Folder2 = "C:\Windows\System32\CCM\Logs" Set FoldPath2 = objFSO.getFolder(Folder2) Else Folder2 = "X:\Windows\System32\CCM\Logs" Set FoldPath2 = objFSO.getFolder(Folder2) End If 'Folder3 If not objFSO.FolderExists("C:\Windows\SysWOW64\CCM\Logs") and If not objFSO.FolderExists("X:\Windows\SysWOW64\CCM\Logs") then Folder3 = false End If If objFSO.FolderExists("C:\Windows\SysWOW64\CCM\Logs") Then Folder3 = "C:\Windows\SysWOW64\CCM\Logs" set FolderPath3 =objFSO.getFolder(Folder3) Else Folder3 = "X:\Windows\SysWOW64\CCM\Logs" Set FoldPath3 = objFSO.getFolder(Folder3) End If set objFSO = CreateObject("Scripting.FileSystemObject") objFSO.OpenTextFile(MyTarget, 2, True).Write "PK" & Chr(5) & Chr(6) _ & String(18, Chr(0)) Set ShellApp = CreateObject("Shell.Application") Set zip = ShellApp.NameSpace(MyTarget) 'checks if files are there before trying to copy 'otherwise it will error out If folder1 = True And FoldPath1.files.Count >= 1 Then zip.CopyHere Folder1 End If WScript.Sleep 3000 If folder2 = true And FoldPath2.files.Count >= 1 Then zip.CopyHere Folder2 End If WScript.Sleep 3000 If folder3 = true And FoldPath3.files.Count >= 1 Then zip.CopyHere Folder3 End If WScript.Sleep 5000 set ShellApp = Nothing set ZipFile = Nothing Set Folder1 = Nothing Set Folder2 = Nothing Set Folder3 = Nothing createobject("wscript.shell").popup "Zip File Created Successfully", 3

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ASP.Net MVC 2 Auto Complete Textbox With Custom View Model Attribute & EditorTemplate

- by SeanMcAlinden

In this post I’m going to show how to create a generic, ajax driven Auto Complete text box using the new MVC 2 Templates and the jQuery UI library. The template will be automatically displayed when a property is decorated with a custom attribute within the view model. The AutoComplete text box in action will look like the following: The first thing to do is to do is visit my previous blog post to put the custom model metadata provider in place, this is necessary when using custom attributes on the view model. http://weblogs.asp.net/seanmcalinden/archive/2010/06/11/custom-asp-net-mvc-2-modelmetadataprovider-for-using-custom-view-model-attributes.aspx Once this is in place, make sure you visit the jQuery UI and download the latest stable release – in this example I’m using version 1.8.2. You can download it here. Add the jQuery scripts and css theme to your project and add references to them in your master page. Should look something like the following: Site.Master <head runat="server"> <title><asp:ContentPlaceHolder ID="TitleContent" runat="server" /></title> <link href="../../Content/Site.css" rel="stylesheet" type="text/css" /> <link href="../../css/ui-lightness/jquery-ui-1.8.2.custom.css" rel="stylesheet" type="text/css" /> <script src="../../Scripts/jquery-1.4.2.min.js" type="text/javascript"></script> <script src="../../Scripts/jquery-ui-1.8.2.custom.min.js" type="text/javascript"></script> </head> Once this is place we can get started. Creating the AutoComplete Custom Attribute The auto complete attribute will derive from the abstract MetadataAttribute created in my previous post. It will look like the following: AutoCompleteAttribute using System.Collections.Generic; using System.Web.Mvc; using System.Web.Routing; namespace Mvc2Templates.Attributes { public class AutoCompleteAttribute : MetadataAttribute { public RouteValueDictionary RouteValueDictionary; public AutoCompleteAttribute(string controller, string action, string parameterName) { this.RouteValueDictionary = new RouteValueDictionary(); this.RouteValueDictionary.Add("Controller", controller); this.RouteValueDictionary.Add("Action", action); this.RouteValueDictionary.Add(parameterName, string.Empty); } public override void Process(ModelMetadata modelMetaData) { modelMetaData.AdditionalValues.Add("AutoCompleteUrlData", this.RouteValueDictionary); modelMetaData.TemplateHint = "AutoComplete"; } } } As you can see, the constructor takes in strings for the controller, action and parameter name. The parameter name will be used for passing the search text within the auto complete text box. The constructor then creates a new RouteValueDictionary which we will use later to construct the url for getting the auto complete results via ajax. The main interesting method is the method override called Process. With the process method, the route value dictionary is added to the modelMetaData AdditionalValues collection. The TemplateHint is also set to AutoComplete, this means that when the view model is parsed for display, the MVC 2 framework will look for a view user control template called AutoComplete, if it finds one, it uses that template to display the property. The View Model To show you how the attribute will look, this is the view model I have used in my example which can be downloaded at the end of this post. View Model using System.ComponentModel; using Mvc2Templates.Attributes; namespace Mvc2Templates.Models { public class TemplateDemoViewModel { [AutoComplete("Home", "AutoCompleteResult", "searchText")] [DisplayName("European Country Search")] public string SearchText { get; set; } } } As you can see, the auto complete attribute is called with the controller name, action name and the name of the action parameter that the search text will be passed into. The AutoComplete Template Now all of this is in place, it’s time to create the AutoComplete template. Create a ViewUserControl called AutoComplete.ascx at the following location within your application – Views/Shared/EditorTemplates/AutoComplete.ascx Add the following code: AutoComplete.ascx <%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl" %> <% var propertyName = ViewData.ModelMetadata.PropertyName; var propertyValue = ViewData.ModelMetadata.Model; var id = Guid.NewGuid().ToString(); RouteValueDictionary urlData = (RouteValueDictionary)ViewData.ModelMetadata.AdditionalValues.Where(x => x.Key == "AutoCompleteUrlData").Single().Value; var url = Mvc2Templates.Views.Shared.Helpers.RouteHelper.GetUrl(this.ViewContext.RequestContext, urlData); %> <input type="text" name="<%= propertyName %>" value="<%= propertyValue %>" id="<%= id %>" class="autoComplete" /> <script type="text/javascript"> $(function () { $("#<%= id %>").autocomplete({ source: function (request, response) { $.ajax({ url: "<%= url %>" + request.term, dataType: "json", success: function (data) { response(data); } }); }, minLength: 2 }); }); </script> There is a lot going on in here but when you break it down it’s quite simple. Firstly, the property name and property value are retrieved through the model meta data. These are required to ensure that the text box input has the correct name and data to allow for model binding. If you look at line 14 you can see them being used in the text box input creation. The interesting bit is on line 8 and 9, this is the code to retrieve the route value dictionary we added into the model metada via the custom attribute. Line 11 is used to create the url, in order to do this I created a quick helper class which looks like the code below titled RouteHelper. The last bit of script is the code to initialise the jQuery UI AutoComplete control with the correct url for calling back to our controller action. RouteHelper using System.Web.Mvc; using System.Web.Routing; namespace Mvc2Templates.Views.Shared.Helpers { public static class RouteHelper { const string Controller = "Controller"; const string Action = "Action"; const string ReplaceFormatString = "REPLACE{0}"; public static string GetUrl(RequestContext requestContext, RouteValueDictionary routeValueDictionary) { RouteValueDictionary urlData = new RouteValueDictionary(); UrlHelper urlHelper = new UrlHelper(requestContext); int i = 0; foreach(var item in routeValueDictionary) { if (item.Value == string.Empty) { i++; urlData.Add(item.Key, string.Format(ReplaceFormatString, i.ToString())); } else { urlData.Add(item.Key, item.Value); } } var url = urlHelper.RouteUrl(urlData); for (int index = 1; index <= i; index++) { url = url.Replace(string.Format(ReplaceFormatString, index.ToString()), string.Empty); } return url; } } } See it in action All you need to do to see it in action is pass a view model from your controller with the new AutoComplete attribute attached and call the following within your view: <%= this.Html.EditorForModel() %> NOTE: The jQuery UI auto complete control expects a JSON string returned from your controller action method… as you can’t use the JsonResult to perform GET requests, use a normal action result, convert your data into json and return it as a string via a ContentResult. If you download the solution it will be very clear how to handle the controller and action for this demo. The full source code for this post can be downloaded here. It has been developed using MVC 2 and Visual Studio 2010. As always, I hope this has been interesting/useful. Kind Regards, Sean McAlinden.

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CodePlex Daily Summary for Saturday, March 06, 2010

CodePlex Daily Summary for Saturday, March 06, 2010New ProjectsAgr.CQRS: Agr.CQRS is a C# framework for DDD applications that use the Command Query Responsibility Segregation pattern (CQRS) and Event Sourcing. BigDays 2010: Big>Days 2010BizTalk - Controlled Admin: Hi .NET folks, I am planning to start project on a Controlled BizTalk Admin tool. This tool will be useful for the organizations which have "Sh...Blacklist of Providers: Blacklist of Providers - the application for department of warehouse logistics (warehouse) at firms.Career Vector: A job board software.Chargify Demo: This is a sample website for ChargifyConceptual: Concept description and animationEric Hexter: My publicly available source code and examplesFluentNHibernate.Search: A Fluent NHibernate.Search mapping interface for NHibernate provider implementation of Lucene.NET.FreelancePlanner: FreelancePlanner is a project tracking tool for freelance translators.HTMLx - JavaScript on the Server for .NET: HTMLx is a set of libraries based on ASP.NET engine to provide JavaScript programmability on the server side. It allows Web developers to use JavaS...IronMSBuild: IronMSBuild is a custom MSBuild Task, which allows you to execute IronRuby scripts. // have to provide some examples LINQ To Blippr: LINQ to Blippr is an open source LINQ Provider for the micro-reviewing service Blippr. LINQ to Blippr makes it easier and more efficent for develo...Luk@sh's HTML Parser: library that simplifies parsing of the HTML documents, for .NETMeta Choons: Unsure as yet but will be a kind of discogs type site but different..NetWork2: NetWork2Regular Expression Chooser: Simple gui for choosing the regular expressions that have become more than simple.See.Sharper: Hopefully useful C# extensions.SharePoint 2010 Toggle User Interface: Toggle the SharePoint 2010 user interface between the new SharePoint 2010 user interface and SharePoint 2007 user interface.Silverlight DiscussionBoard for SharePoint: This is a sharepoint 3.0 webpart that uses a silverlight treeview to display metadata about sharepoint discussions anduses the html bridge to show...Simple Sales Tracking CRM API Wrapper: The Simple Sales Tracking API Wrapper, enables easy extention development and integration with the hosted service at http://www.simplesalestracking...Syntax4Word: A syntax addin for word 2007.TortoiseHg installer builder: TortoiseHg and Mercurial installer builder for Windowsunbinder: Model un binding for route value dictionariesWindows Workflow Foundation on Codeplex: This site has previews of Workflow features which are released out of band for the purposes of adoption and feedback.XNA RSM Render State Manager: Render state management idea for XNA games. Enables isolation between draw calls whilst reducing DX9 SetRenderState calls to the minimum.New ReleasesAgr.CQRS: Sourcecode package: Agr.CQRS is a C# framework for DDD applications that use the Command Query Responsibility Segregation pattern (CQRS) and Event Sourcing. This dow...Book Cataloger: Preview 0.1.6a: New Features: Export to Word 2007 Bibliography format Dictionary list editors for Binding, Condition Improvements: Stability improved Content ...Braintree Client Library: Braintree-1.1.2: Includes minor enhancements to CreditCard and ValidationErrors to support upcoming example application.CassiniDev - Cassini 3.5 Developers Edition: CassiniDev v3.5.0.5: For usage see Readme.htm in download. New in CassiniDev v3.5.0.5 Reintroduced the Lib project and signed all Implemented the CassiniSqlFixture -...Composure: Calcium-64420-VS2010rc1.NET4.SL3: This is a simple conversion of Calcium (rev 64420) built in VS2010 RC1 against .NET4 and Silverlight 3. No source files were changed and ALL test...Composure: MS AJAX Library (46266) for VS2010 RC1 .NET4: This is a quick port of Microsoft's AJAX Library (rev 46266) for Visual Studio 2010 RC1 built against .NET 4.0. Since this conversion was thrown t...Composure: MS Web Test Lightweight for VS2010 RC1 .NET4: A simple conversion of Microsoft's Web Test Lightweight for Visual Studio 2010 RC1 .NET 4.0. This is part of a larger "special request" conversion...CoNatural Components: CoNatural Components 1.5: Supporting new data types: Added support for binary data types -> binary, varbinary, etc maps to byte[] Now supporting SQL Server 2008 new types ...Extensia: Extensia 2010-03-05: Extensia is a very large list of extension methods and a few helper types. Some extension methods are not practical (e.g. slow) whilst others are....Fluent Assertions: Fluent Assertions release 1.1: In this release, we've worked hard to add some important missing features that we really needed, and also improve resiliance against illegal argume...Fluent Ribbon Control Suite: Fluent Ribbon Control Suite 1.0 RC: Fluent Ribbon Control Suite 1.0 (Release Candidate)Includes: Fluent.dll (with .pdb and .xml, debug and release version) Showcase Application Sa...FluentNHibernate.Search: 0.1 Beta: First beta versionFolderSize: FolderSize.Win32.1.0.7.0: FolderSize.Win32.1.0.6.0 A simple utility intended to be used to scan harddrives for the folders that take most place and display this to the user...Free Silverlight & WPF Chart Control - Visifire: Silverlight and WPF Step Line Chart: Hi, With this release Visifire introduces Step Line Chart. This release also contains fix for the following issues: * In WPF, if AnimatedUpd...Html to OpenXml: HtmlToOpenXml 1.0: The dll library to include in your project. The dll is signed for GAC support. Compiled with .Net 3.5, Dependencies on System.Drawing.dll and Docu...Line Counter: 1.5.1: The Line Counter is a tool to calculate lines of your code files. The tool was written in .NET 2.0. Line Counter 1.5.1 Added outline icons and lin...Lokad Cloud - .NET O/C mapper (object to cloud) for Windows Azure: Lokad.Cloud v1.0.662.1: You can get the most recent release directly from the build server at http://build.lokad.com/distrib/Lokad.Cloud/Lost in Translation: LostInTranslation v0.2: Alpha release: function complete but not UX complete.MDownloader: MDownloader-0.15.7.56349: Supported large file resumption. Fixed minor bugs.Mini C# Lab: Mini CSharp Lab Ver 1.4: The primary new feature of Ver 1.4 is batch mode! Now you can run Mini C# Lab program as a scheduled task, no UI interactivity is needed. Here ar...Mobile Store: First drop: First droppatterns & practices SharePoint Guidance: SPG2010 Drop6: SharePoint Guidance Drop Notes Microsoft patterns and practices ****************************************** ***************************************...Picasa Downloader: PicasaDownloader (41446): Changelog: Replaced some exception messages by a Summary dialog shown after downloading if there have been problems. Corrected the Portable vers...Pod Thrower: Version 1: This is the first release, I'm sure there are bugs, the tool is fully functional and I'm using it currently.PowerShell Provider BizTalk: BizTalkFactory PowerShell Provider - 1.1-snapshot: This release constitutes the latest development snapshot for the Provider. Please, leave feedback and use the Issue Tracker to help improve this pr...Resharper Settings Manager: RSM 1.2.1: This is a bug fix release. Changes Fixed plug-in crash when shared settings file was modified externally.Reusable Library Demo: Reusable Library Demo v1.0.2: A demonstration of reusable abstractions for enterprise application developerSharePoint 2010 Toggle User Interface: SharePoint Toggle User Interface: Release 1.0.0.0Starter Kit Mytrip.Mvc.Entity: Mytrip.Mvc.Entity(net3.5 MySQL) 1.0 Beta: MySQL VS 2008 EF Membership UserManager FileManager Localization Captcha ClientValidation Theme CrossBrowserTortoiseHg: TortoiseHg 1.0: http://bitbucket.org/tortoisehg/stable/wiki/ReleaseNotes Please backup your user Mercurial.ini file and then uninstall any 0.9.X release before in...Visual Studio 2010 and Team Foundation Server 2010 VM Factory: Rangers Virtualization Guidance: Rangers Virtualization Guidance Focused guidance on creating a Rangers base image manually and introduction of PowerShell scripts to automate many ...Visual Studio DSite: Advanced Email Program (Visual Basic 2008): This email program can send email to any one using your email username and email credentials. The email program can also attatch attactments to you...WPF ShaderEffect Generator: WPF ShaderEffect Generator 1.6: Several improvements and bug fixes have gone into the comment parsing code for the registers. The plug-in should now correctly pay attention to th...WSDLGenerator: WSDLGenerator 0.0.0.3: - Fixed SharePoint generated *.wsdl.aspx file - Added commandline option -wsdl which does only generate the wsdl file.Most Popular ProjectsMetaSharpRawrWBFS ManagerAJAX Control ToolkitMicrosoft SQL Server Product Samples: DatabaseSilverlight ToolkitWindows Presentation Foundation (WPF)ASP.NETLiveUpload to FacebookMicrosoft SQL Server Community & SamplesMost Active ProjectsUmbraco CMSRawrSDS: Scientific DataSet library and toolsBlogEngine.NETjQuery Library for SharePoint Web Servicespatterns & practices – Enterprise LibraryIonics Isapi Rewrite FilterFluent AssertionsComposureDiffPlex - a .NET Diff Generator

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Differences Between NHibernate and Entity Framework

- by Ricardo Peres

Introduction NHibernate and Entity Framework are two of the most popular O/RM frameworks on the .NET world. Although they share some functionality, there are some aspects on which they are quite different. This post will describe this differences and will hopefully help you get started with the one you know less. Mind you, this is a personal selection of features to compare, it is by no way an exhaustive list. History First, a bit of history. NHibernate is an open-source project that was first ported from Java’s venerable Hibernate framework, one of the first O/RM frameworks, but nowadays it is not tied to it, for example, it has .NET specific features, and has evolved in different ways from those of its Java counterpart. Current version is 3.3, with 3.4 on the horizon. It currently targets .NET 3.5, but can be used as well in .NET 4, it only makes no use of any of its specific functionality. You can find its home page at NHForge. Entity Framework 1 came out with .NET 3.5 and is now on its second major version, despite being version 4. Code First sits on top of it and but came separately and will also continue to be released out of line with major .NET distributions. It is currently on version 4.3.1 and version 5 will be released together with .NET Framework 4.5. All versions will target the current version of .NET, at the time of their release. Its home location is located at MSDN. Architecture In NHibernate, there is a separation between the Unit of Work and the configuration and model instances. You start off by creating a Configuration object, where you specify all global NHibernate settings such as the database and dialect to use, the batch sizes, the mappings, etc, then you build an ISessionFactory from it. The ISessionFactory holds model and metadata that is tied to a particular database and to the settings that came from the Configuration object, and, there will typically be only one instance of each in a process. Finally, you create instances of ISession from the ISessionFactory, which is the NHibernate representation of the Unit of Work and Identity Map. This is a lightweight object, it basically opens and closes a database connection as required and keeps track of the entities associated with it. ISession objects are cheap to create and dispose, because all of the model complexity is stored in the ISessionFactory and Configuration objects. As for Entity Framework, the ObjectContext/DbContext holds the configuration, model and acts as the Unit of Work, holding references to all of the known entity instances. This class is therefore not lightweight as its NHibernate counterpart and it is not uncommon to see examples where an instance is cached on a field. Mappings Both NHibernate and Entity Framework (Code First) support the use of POCOs to represent entities, no base classes are required (or even possible, in the case of NHibernate). As for mapping to and from the database, NHibernate supports three types of mappings: XML-based, which have the advantage of not tying the entity classes to a particular O/RM; the XML files can be deployed as files on the file system or as embedded resources in an assembly; Attribute-based, for keeping both the entities and database details on the same place at the expense of polluting the entity classes with NHibernate-specific attributes; Strongly-typed code-based, which allows dynamic creation of the model and strongly typing it, so that if, for example, a property name changes, the mapping will also be updated. Entity Framework can use: Attribute-based (although attributes cannot express all of the available possibilities – for example, cascading); Strongly-typed code mappings. Database Support With NHibernate you can use mostly any database you want, including: SQL Server; SQL Server Compact; SQL Server Azure; Oracle; DB2; PostgreSQL; MySQL; Sybase Adaptive Server/SQL Anywhere; Firebird; SQLLite; Informix; Any through OLE DB; Any through ODBC. Out of the box, Entity Framework only supports SQL Server, but a number of providers exist, both free and commercial, for some of the most used databases, such as Oracle and MySQL. See a list here. Inheritance Strategies Both NHibernate and Entity Framework support the three canonical inheritance strategies: Table Per Type Hierarchy (Single Table Inheritance), Table Per Type (Class Table Inheritance) and Table Per Concrete Type (Concrete Table Inheritance). Associations Regarding associations, both support one to one, one to many and many to many. However, NHibernate offers far more collection types: Bags of entities or values: unordered, possibly with duplicates; Lists of entities or values: ordered, indexed by a number column; Maps of entities or values: indexed by either an entity or any value; Sets of entities or values: unordered, no duplicates; Arrays of entities or values: indexed, immutable. Querying NHibernate exposes several querying APIs: LINQ is probably the most used nowadays, and really does not need to be introduced; Hibernate Query Language (HQL) is a database-agnostic, object-oriented SQL-alike language that exists since NHibernate’s creation and still offers the most advanced querying possibilities; well suited for dynamic queries, even if using string concatenation; Criteria API is an implementation of the Query Object pattern where you create a semi-abstract conceptual representation of the query you wish to execute by means of a class model; also a good choice for dynamic querying; Query Over offers a similar API to Criteria, but using strongly-typed LINQ expressions instead of strings; for this, although more refactor-friendlier that Criteria, it is also less suited for dynamic queries; SQL, including stored procedures, can also be used; Integration with Lucene.NET indexer is available. As for Entity Framework: LINQ to Entities is fully supported, and its implementation is considered very complete; it is the API of choice for most developers; Entity-SQL, HQL’s counterpart, is also an object-oriented, database-independent querying language that can be used for dynamic queries; SQL, of course, is also supported. Caching Both NHibernate and Entity Framework, of course, feature first-level cache. NHibernate also supports a second-level cache, that can be used among multiple ISessionFactorys, even in different processes/machines: Hashtable (in-memory); SysCache (uses ASP.NET as the cache provider); SysCache2 (same as above but with support for SQL Server SQL Dependencies); Prevalence; SharedCache; Memcached; Redis; NCache; Appfabric Caching. Out of the box, Entity Framework does not have any second-level cache mechanism, however, there are some public samples that show how we can add this. ID Generators NHibernate supports different ID generation strategies, coming from the database and otherwise: Identity (for SQL Server, MySQL, and databases who support identity columns); Sequence (for Oracle, PostgreSQL, and others who support sequences); Trigger-based; HiLo; Sequence HiLo (for databases that support sequences); Several GUID flavors, both in GUID as well as in string format; Increment (for single-user uses); Assigned (must know what you’re doing); Sequence-style (either uses an actual sequence or a single-column table); Table of ids; Pooled (similar to HiLo but stores high values in a table); Native (uses whatever mechanism the current database supports, identity or sequence). Entity Framework only supports: Identity generation; GUIDs; Assigned values. Properties NHibernate supports properties of entity types (one to one or many to one), collections (one to many or many to many) as well as scalars and enumerations. It offers a mechanism for having complex property types generated from the database, which even include support for querying. It also supports properties originated from SQL formulas. Entity Framework only supports scalars, entity types and collections. Enumerations support will come in the next version. Events and Interception NHibernate has a very rich event model, that exposes more than 20 events, either for synchronous pre-execution or asynchronous post-execution, including: Pre/Post-Load; Pre/Post-Delete; Pre/Post-Insert; Pre/Post-Update; Pre/Post-Flush. It also features interception of class instancing and SQL generation. As for Entity Framework, only two events exist: ObjectMaterialized (after loading an entity from the database); SavingChanges (before saving changes, which include deleting, inserting and updating). Tracking Changes For NHibernate as well as Entity Framework, all changes are tracked by their respective Unit of Work implementation. Entities can be attached and detached to it, Entity Framework does, however, also support self-tracking entities. Optimistic Concurrency Control NHibernate supports all of the imaginable scenarios: SQL Server’s ROWVERSION; Oracle’s ORA_ROWSCN; A column containing date and time; A column containing a version number; All/dirty columns comparison. Entity Framework is more focused on Entity Framework, so it only supports: SQL Server’s ROWVERSION; Comparing all/some columns. Batching NHibernate has full support for insertion batching, but only if the ID generator in use is not database-based (for example, it cannot be used with Identity), whereas Entity Framework has no batching at all. Cascading Both support cascading for collections and associations: when an entity is deleted, their conceptual children are also deleted. NHibernate also offers the possibility to set the foreign key column on children to NULL instead of removing them. Flushing Changes NHibernate’s ISession has a FlushMode property that can have the following values: Auto: changes are sent to the database when necessary, for example, if there are dirty instances of an entity type, and a query is performed against this entity type, or if the ISession is being disposed; Commit: changes are sent when committing the current transaction; Never: changes are only sent when explicitly calling Flush(). As for Entity Framework, changes have to be explicitly sent through a call to AcceptAllChanges()/SaveChanges(). Lazy Loading NHibernate supports lazy loading for Associated entities (one to one, many to one); Collections (one to many, many to many); Scalar properties (thing of BLOBs or CLOBs). Entity Framework only supports lazy loading for: Associated entities; Collections. Generating and Updating the Database Both NHibernate and Entity Framework Code First (with the Migrations API) allow creating the database model from the mapping and updating it if the mapping changes. Extensibility As you can guess, NHibernate is far more extensible than Entity Framework. Basically, everything can be extended, from ID generation, to LINQ to SQL transformation, HQL native SQL support, custom column types, custom association collections, SQL generation, supported databases, etc. With Entity Framework your options are more limited, at least, because practically no information exists as to what can be extended/changed. It features a provider model that can be extended to support any database. Integration With Other Microsoft APIs and Tools When it comes to integration with Microsoft technologies, it will come as no surprise that Entity Framework offers the best support. For example, the following technologies are fully supported: ASP.NET (through the EntityDataSource); ASP.NET Dynamic Data; WCF Data Services; WCF RIA Services; Visual Studio (through the integrated designer). Documentation This is another point where Entity Framework is superior: NHibernate lacks, for starters, an up to date API reference synchronized with its current version. It does have a community mailing list, blogs and wikis, although not much used. Entity Framework has a number of resources on MSDN and, of course, several forums and discussion groups exist. Conclusion Like I said, this is a personal list. I may come as a surprise to some that Entity Framework is so behind NHibernate in so many aspects, but it is true that NHibernate is much older and, due to its open-source nature, is not tied to product-specific timeframes and can thus evolve much more rapidly. I do like both, and I chose whichever is best for the job I have at hands. I am looking forward to the changes in EF5 which will add significant value to an already interesting product. So, what do you think? Did I forget anything important or is there anything else worth talking about? Looking forward for your comments!

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CodePlex Daily Summary for Sunday, March 14, 2010

CodePlex Daily Summary for Sunday, March 14, 2010New ProjectsBeerMath.net: BeerMath.net lets brewers calculate expected values for their recipes. Written entirely in C#, it can be used in any .Net language.Bible Study: Данный проект предусматривает создание программного обеспечения, предоставляющего пользователю гибкие и мощные инструменты для чтения и изучения Пи...E-Messenger: Description détaillé du sujet : Développement d'une application (client lourd) de messagerie instantané et de partage de fichier interne à ESPRIT....Facebook Azure Toolkit: The Facebook Azure Toolit provides a flexible and scalable hosting platform for the smallest and largest of Facebook applications. This toolkit hel...Gherkin editor: A simple text editor to write specifications using Gherkin. The editor supports code completion, syntax highlighting, spell checker and more.Mydra Center: Mydra Center is a Media center with the particularity to be very flexible, allowing developers to extend it and add new features. The philosophy be...MyTwits - A rich Twitter client for Windows powered by WPF: MyTwits is a free Twitter client for Windows XP/Vista/7 powered by WPF which gives you freedom to twit right from your desktop. You can do almost a...na laborke: aaaaaaaaaaaaaaasssssssssssssssddddddddddddddddddddfffffffffffffNMTools: The "Network Management Tools" (NMTools) complete OpenSLIM CMDB capabilities with Network Discovery, Automation and Configuration Managem...orionSRO: This project aims to make a fully functional server.Project Naduvar: Project Naduvar, is a centralized Locking Service in distribute systems. You can use this service in any of your existing distributed application. ...Silverlight Input Keyboard: Silverlight Input Keyboard and Behaviorsuh: uh.py is a command line tool that helps developers porting native projects from a case-insensitive filesystem to a case-sensitive filesystem by sea...New ReleasesAmiBroker Plug-ins with C#. A non official AmiBroker Plug-in SDK: AmiBroker Plug-in SDK v0.0.3: Small changesAmiBroker Plug-ins with C#. A non official AmiBroker Plug-in SDK: AmiBroker Plug-in SDK v0.0.4: Small updatesAStyle AddIn for SharpDevelop (Alex): 2.0 Production: #D 3.* add in with updated GUI elements.Coding Cockerel code samples: Validation with ASP .NET MVC and jQuery: Code sample related to the following blog post, http://codingcockerel.co.uk/consistent-validation-with-asp-net-mvc-and-jquery/.CoreSystem Library: Release - 1.0.3725.10575: This release contains a new class Crypto which makes encryption and descryption of string easy, it uses TripleDESCrystal Mapper: Release - 2.0.3725.11614: This is preview if release 2.0* that I promised, it contains following new features Tracking dirty entities and provide Save function to save all ...Digital Media Processing Project 1: Image Processor: Image Processor Alpha: First Release Features Include: Curve Adjustment Tool Region Growing Segmetation Threshold Segmentation Guassian/Butterworth High/Low pass filter...Exepack.NET: Exepack.NET version 0.03 beta: Exepack.NET is executable file compressor for .NET Framework. It allows to package your .NET application consisting of an executable file and sever...Export code as Code Snippet - Addin for Visual Studio 2008/2010 RC: VS 2010 Release Candidate: This release targets Visual Studio 2010 Release Candidate. It includes full Visual Basic 2010 source code. Fixes already available in previous ve...Facebook Azure Toolkit: 0.9 Beta: This is the initial beta releaseFamily Tree Analyzer: Version 1.0.5.0: Version 1.0.5.0 Change the way Census & Individual reports columns are sized so that user can resize later. Add filter to exclude individuals over...Home Access Plus+: v3.1.2.1: Version 3.1.2.1 Release Change Log: Added SSL SMTP Added SSL Authentication File Changes: ~/bin/CHS Extranet.dll ~/bin/CHS Extranet.pdb ~/we...Home Access Plus+: v3.1.3.1: Version 3.1.3.1 Release Change Log: Fixed Help Desk File Changes: ~/bin/CHS Extranet.dll ~/bin/CHS Extranet.pdb ~/helpdesk/*.htmIceChat: IceChat 2009 Alpha 11.6 Full Install: IceChat 2009 Alpha 11.6 - Full Installer, installs IceChat 2009, and the Emoticons, and will also download .Net Framework 2.0 if needed.IceChat: IceChat 2009 Alpha 11.6 Simple Binaries: This simply the IceChat2009.exe and the IPluginIceChat.dll needed to run IceChat 2009. Is not an installer, does not include emoticons.IceChat: IceChat 2009 Alpha 11.6 Source Code: IceChat 2009 Alpha 11.6 Source CodeLunar Phase Silverlight Gadget: Lunar Phase RC: Stable release. 6 languages Auto refresh. Name / Light problem fixedMiracle OS: Miracle OS Alpha 0.001: Our first release is the Alpha 0.001. Miracle OS doens't work at all, but we work on it. You to? Please help us.MyTwits - A rich Twitter client for Windows powered by WPF: MyTwits BETA 1: I'm happy to release first BETA version of MyTwits. Just download the zip file attached and run setup.exe and you are done! If you've any problem...MyTwits - A rich Twitter client for Windows powered by WPF: MyTwits Source BETA 1: I'm providing you just a project file, I'll upload complete source code once I fine tuned the code.NMock3: NMock3 - Beta 5, .NET 3.5: Hilights of this releaseTutorials have been updated and are in a much better place now. (they compile) Public API is getting locked down. Void me...Project Naduvar: com.declum.naduvar.locking: First ReleaseQueryToGrid Module for DotNetNuke®: QueryToGrid Module version 01.00.01: This module is a proof of concept for both using AJAX in a DotNetNuke® module, and for using SQL in a module. »»» IMPORTANT NOTE ««« Using this mo...SCSI Interface for Multimedia and Block Devices: Release 10 - Almost like a commercial burner!!: I made many changes in the ISOBurn program in this version, making it much more user-friendly than before. You can now add, rename, and delete file...Silverlight Input Keyboard: Initial Release: For more information see http://www.orktane.com/Blog/post/2009/11/09/Virtual-Input-Keyboard-Behaviours-for-Silverlight.aspxThe Silverlight Hyper Video Player [http://slhvp.com]: RC: The release candidate is now in place. Unfortunately, because there are aspects of it that I'm not yet ready to discuss, the code for the RC will...twNowplaying: twNowplaying 1.0.0.3: Press the Twitter icon to get started, don't forget to submit bugs to the issue tracker. What's new This release has some minor UI fixes.uh: 1.0: This is the first stable release. It isn't super full featured but it does the basics.UriTree: UriTree 2.0.0: This release is the WPF version of this application.VCC: Latest build, v2.1.30313.0: Automatic drop of latest buildVr30 OS: Blackra1n: The software was made by blackra1n for jailbreak iphone and ipod touch. Is not the Vr30 OS Team ProjectVr30 OS: Vr30 Operating System Live Cd 1.0: The Operating system linux made by team. For more information go to http://vr30os.tuxfamily.orgWatchersNET.TagCloud: WatchersNET.TagCloud 01.01.00: Whats New Decide between Tags generated from the Search words, or create your own Tag List Custom Tag list changes Small BugfixesZeta Resource Editor: Source code release 2010-03-13: New sources, some small fixes.ZipStorer - A Pure C# Class to Store Files in Zip: ZipStorer 2.35: Improved UTF-8 Support Correct writting of modification time for extracted filesMost Popular ProjectsMetaSharpWBFS ManagerRawrAJAX Control ToolkitMicrosoft SQL Server Product Samples: DatabaseSilverlight ToolkitWindows Presentation Foundation (WPF)ASP.NET Ajax LibraryASP.NETMicrosoft SQL Server Community & SamplesMost Active ProjectsRawrN2 CMSBlogEngine.NETpatterns & practices – Enterprise LibrarySharePoint Team-MailerFasterflect - A Fast and Simple Reflection APICaliburn: An Application Framework for WPF and SilverlightjQuery Library for SharePoint Web ServicesCalcium: A modular application toolset leveraging PrismFarseer Physics Engine

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Complete Guide to Symbolic Links (symlinks) on Windows or Linux

- by Matthew Guay

Want to easily access folders and files from different folders without maintaining duplicate copies? Here’s how you can use Symbolic Links to link anything in Windows 7, Vista, XP, and Ubuntu. So What Are Symbolic Links Anyway? Symbolic links, otherwise known as symlinks, are basically advanced shortcuts. You can create symbolic links to individual files or folders, and then these will appear like they are stored in the folder with the symbolic link even though the symbolic link only points to their real location. There are two types of symbolic links: hard and soft. Soft symbolic links work essentially the same as a standard shortcut. When you open a soft link, you will be redirected to the folder where the files are stored. However, a hard link makes it appear as though the file or folder actually exists at the location of the symbolic link, and your applications won’t know any different. Thus, hard links are of the most interest in this article. Why should I use Symbolic Links? There are many things we use symbolic links for, so here’s some of the top uses we can think of: Sync any folder with Dropbox – say, sync your Pidgin Profile Across Computers Move the settings folder for any program from its original location Store your Music/Pictures/Videos on a second hard drive, but make them show up in your standard Music/Pictures/Videos folders so they’ll be detected my your media programs (Windows 7 Libraries can also be good for this) Keep important files accessible from multiple locations And more! If you want to move files to a different drive or folder and then symbolically link them, follow these steps: Close any programs that may be accessing that file or folder Move the file or folder to the new desired location Follow the correct instructions below for your operating system to create the symbolic link. Caution: Make sure to never create a symbolic link inside of a symbolic link. For instance, don’t create a symbolic link to a file that’s contained in a symbolic linked folder. This can create a loop, which can cause millions of problems you don’t want to deal with. Seriously. Create Symlinks in Any Edition of Windows in Explorer Creating symlinks is usually difficult, but thanks to the free Link Shell Extension, you can create symbolic links in all modern version of Windows pain-free. You need to download both Visual Studio 2005 redistributable, which contains the necessary prerequisites, and Link Shell Extension itself (links below). Download the correct version (32 bit or 64 bit) for your computer. Run and install the Visual Studio 2005 Redistributable installer first. Then install the Link Shell Extension on your computer. Your taskbar will temporally disappear during the install, but will quickly come back. Now you’re ready to start creating symbolic links. Browse to the folder or file you want to create a symbolic link from. Right-click the folder or file and select Pick Link Source. To create your symlink, right-click in the folder you wish to save the symbolic link, select “Drop as…”, and then choose the type of link you want. You can choose from several different options here; we chose the Hardlink Clone. This will create a hard link to the file or folder we selected. The Symbolic link option creates a soft link, while the smart copy will fully copy a folder containing symbolic links without breaking them. These options can be useful as well. Here’s our hard-linked folder on our desktop. Notice that the folder looks like its contents are stored in Desktop\Downloads, when they are actually stored in C:\Users\Matthew\Desktop\Downloads. Also, when links are created with the Link Shell Extension, they have a red arrow on them so you can still differentiate them. And, this works the same way in XP as well. Symlinks via Command Prompt Or, for geeks who prefer working via command line, here’s how you can create symlinks in Command Prompt in Windows 7/Vista and XP. In Windows 7/Vista In Windows Vista and 7, we’ll use the mklink command to create symbolic links. To use it, we have to open an administrator Command Prompt. Enter “command” in your start menu search, right-click on Command Prompt, and select “Run as administrator”. To create a symbolic link, we need to enter the following in command prompt: mklink /prefix link_path file/folder_path First, choose the correct prefix. Mklink can create several types of links, including the following: /D – creates a soft symbolic link, which is similar to a standard folder or file shortcut in Windows. This is the default option, and mklink will use it if you do not enter a prefix. /H – creates a hard link to a file /J – creates a hard link to a directory or folder So, once you’ve chosen the correct prefix, you need to enter the path you want for the symbolic link, and the path to the original file or folder. For example, if I wanted a folder in my Dropbox folder to appear like it was also stored in my desktop, I would enter the following: mklink /J C:\Users\Matthew\Desktop\Dropbox C:\Users\Matthew\Documents\Dropbox Note that the first path was to the symbolic folder I wanted to create, while the second path was to the real folder. Here, in this command prompt screenshot, you can see that I created a symbolic link of my Music folder to my desktop. And here’s how it looks in Explorer. Note that all of my music is “really” stored in C:\Users\Matthew\Music, but here it looks like it is stored in C:\Users\Matthew\Desktop\Music. If your path has any spaces in it, you need to place quotes around it. Note also that the link can have a different name than the file it links to. For example, here I’m going to create a symbolic link to a document on my desktop: mklink /H “C:\Users\Matthew\Desktop\ebook.pdf” “C:\Users\Matthew\Downloads\Before You Call Tech Support.pdf” Don’t forget the syntax: mklink /prefix link_path Target_file/folder_path In Windows XP Windows XP doesn’t include built-in command prompt support for symbolic links, but we can use the free Junction tool instead. Download Junction (link below), and unzip the folder. Now open Command Prompt (click Start, select All Programs, then Accessories, and select Command Prompt), and enter cd followed by the path of the folder where you saved Junction. Junction only creates hard symbolic links, since you can use shortcuts for soft ones. To create a hard symlink, we need to enter the following in command prompt: junction –s link_path file/folder_path As with mklink in Windows 7 or Vista, if your file/folder path has spaces in it make sure to put quotes around your paths. Also, as usual, your symlink can have a different name that the file/folder it points to. Here, we’re going to create a symbolic link to our My Music folder on the desktop. We entered: junction -s “C:\Documents and Settings\Administrator\Desktop\Music” “C:\Documents and Settings\Administrator\My Documents\My Music” And here’s the contents of our symlink. Note that the path looks like these files are stored in a Music folder directly on the Desktop, when they are actually stored in My Documents\My Music. Once again, this works with both folders and individual files. Please Note: Junction would work the same in Windows 7 or Vista, but since they include a built-in symbolic link tool we found it better to use it on those versions of Windows. Symlinks in Ubuntu Unix-based operating systems have supported symbolic links since their inception, so it is straightforward to create symbolic links in Linux distros such as Ubuntu. There’s no graphical way to create them like the Link Shell Extension for Windows, so we’ll just do it in Terminal. Open terminal (open the Applications menu, select Accessories, and then click Terminal), and enter the following: ln –s file/folder_path link_path Note that this is opposite of the Windows commands; you put the source for the link first, and then the path second. For example, let’s create a symbolic link of our Pictures folder in our Desktop. To do this, we entered: ln -s /home/maguay/Pictures /home/maguay/Desktop Once again, here is the contents of our symlink folder. The pictures look as if they’re stored directly in a Pictures folder on the Desktop, but they are actually stored in maguay\Pictures. Delete Symlinks Removing symbolic links is very simple – just delete the link! Most of the command line utilities offer a way to delete a symbolic link via command prompt, but you don’t need to go to the trouble. Conclusion Symbolic links can be very handy, and we use them constantly to help us stay organized and keep our hard drives from overflowing. Let us know how you use symbolic links on your computers! Download Link Shell Extension for Windows 7, Vista, and XP Download Junction for XP Similar Articles Productive Geek Tips Using Symlinks in Windows VistaHow To Figure Out Your PC’s Host Name From the Command PromptInstall IceWM on Ubuntu LinuxAdd Color Coding to Windows 7 Media Center Program GuideSync Your Pidgin Profile Across Multiple PCs with Dropbox TouchFreeze Alternative in AutoHotkey The Icy Undertow Desktop Windows Home Server – Backup to LAN The Clear & Clean Desktop Use This Bookmarklet to Easily Get Albums Use AutoHotkey to Assign a Hotkey to a Specific Window Latest Software Reviews Tinyhacker Random Tips DVDFab 6 Revo Uninstaller Pro Registry Mechanic 9 for Windows PC Tools Internet Security Suite 2010 Gadfly is a cool Twitter/Silverlight app Enable DreamScene in Windows 7 Microsoft’s “How Do I ?” Videos Home Networks – How do they look like & the problems they cause Check Your IMAP Mail Offline In Thunderbird Follow Finder Finds You Twitter Users To Follow

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CodePlex Daily Summary for Monday, March 01, 2010

CodePlex Daily Summary for Monday, March 01, 2010New ProjectsActiveWorlds World Server Admin PowerShell SnapIn: The purpose of this PowerShell SnapIn is to provide a set of tools to administer the world server from PowerShell. It leverages the ActiveWorlds S...AWS SimpleDB Browser: A basic GUI browser tool for inspection and querying of a SimpleDB.Desktop Dimmer: A simple application for dimming the desktop around windows, videos, or other media.Disk Defuzzer: Compare chaos of files and folders with customizable SQL queries. This little application scans files in any two folders, generates data in an A...Dynamic Configuration: Dynamic configuration is a (very) small library to provide an API compatible replacement for the System.Configuration.ConfigurationManager class so...Expression Encoder 3 Visual Basic Samples: Visual Basic Sample code that calls the Expression Encoder 3 object model.Extended Character Keyboard: An lightweight onscreen keyboard that allows you to enter special characters like "á" and "û". Also supports adding of 7 custom buttons.FileHasher: This project provides a simple tool for generating and verifying file hashes. I created this to help the QA team I work with. The project is all C#...Fluent Assertions: Fluent interface for writing more natural specifying assertions with more clarity than the traditional assertion syntax such as offered by MSTest, ...Foursquare BlogEngine Widget: A Basic Widget for BlogEngine which displays the last foursquare Check-insGraffiti CMS Events Plugin: Plugin for Graffiti CMS that allows creating Event posts and rendering an Event CalendarHeadCounter: HeadCounter is a raid attendance and loot tracking application for World of Warcraft.HRM Core (QL Nhan Su): This is software about Human Resource Management in Viet Nam ------------ Đây là phần mềm Quản lý nhân sự tiền lương ở Việt Nam (Nghiệp vụ ở Việt Nam)IronPython Silverlight Sharpdevelop Template: This IronPython Silverlight SharpDevelop Template makes it easier for you to make Silverlight applications in IronPython with Sharpdevelop.kingbox: my test code for study vs 2005link_attraente: Projeto Conclusão de CursoORMSharp.Net: ORMSharp.Net https://code.google.com/p/ormsharp/ http://www.sqlite.org/ http://sqlite.phxsoftware.com/ http://sourceforge.net/projects/sqlite-dotnet2/Orz framework: Orz framework is more like a helpful library, if you are develop with DotNet framework 3.0, it will be very useful to you. Orz framework encapsul...OTManager: OTManagerSharePoint URL Ping Tool: The Url Ping Tool is a farm feature in SharePoint that provide additional performance and tracing information that can be used to troubleshoot issu...SunShine: SunShine ProjectToolSuite.ValidationExpression: assembly with regular expression for the RegularExpressionValidator controlTwitual Studio: A Visual Studio 2010 based Twitter client. Now you have one less reason for pressing Alt+Tab. Plus you still look like you're working!Velocity Hosting Tool: A program designed to aid a HT Velocity host in hosting and recording tournaments.Watermarker: Adds watermark on pictures to prevent copy. Icon taken from PICOL. Can work with packs of images.Zack's Fiasco - ASP.NET Script Includer: Script includer to * include scripts (JS or CSS) once and only once. * include the correct format by differentiating between release and build. Th...New ReleasesAll-In-One Code Framework: All-In-One Code Framework 2010-02-28: Improved and Newly Added Examples:For an up-to-date list, please refer to All-In-One Code Framework Sample Catalog. Samples for ASP.NET Name ...All-In-One Code Framework (简体中文): All-In-One Code Framework 2010-02-28: Improved and Newly Added Examples:For an up-to-date list, please refer to All-In-One Code Framework Sample Catalog. Latest Download Link: http://c...AWS SimpleDB Browser: SimpleDbBrowser.zip Initial Release: The initial release of the SimpleDbBrowser. Unzip the file in the archive and place them all in a folder, then run the .exe. No installer is used...BattLineSvc: V1: First release of BattLineSvcCC.Votd Screen Saver: CC.Votd 1.0.10.301: More bug fixes and minor enhancements. Note: Only download the (Screen Saver) version if you plan to manually install. For most users the (Install...Dynamic Configuration: DynamicConfiguration Release 1: Dynamic Configuration DLL release.eIDPT - Cartão de Cidadão .NET Wrapper: EIDPT VB6 Demo Program: Cartão de Cidadão Middleware Application installation (v1.21 or 1.22) is required for proper use of the eID Lib.eIDPT - Cartão de Cidadão .NET Wrapper: eIDPT VB6 Demo Program Source: Cartão de Cidadão Middleware Application installation (v1.21 or 1.22) is required for proper use of the eID Lib.ESPEHA: Espeha 10: 1. Help available on F1 and via context menu '?' 2. Width of categiries view is preserved througb app starts 3. Drag'nd'drop for tasks view allows ...Extended Character Keyboard: OnscreenSCK Beta V1.0: OnscreenSCK Beta Version 1.0Extended Character Keyboard: OnscreenSCK Beta V1.0 Source: OnscreenSCK Beta Version 1.0 Source CodeFileHasher: Console Version v 0.5: This release provides a very basic and minimal command-line utility for generating and validating file hashes. The supported command-line paramete...Furcadia Framework for Third Party Programs: 0.2.3 Epic Wrench: Warning: Untested on Linux.FurcadiaLib\Net\NetProxy.cs: Fixed a bug I made before update. FurcadiaFramework_Example\Demo\IDemo.cs: Ignore me. F...Graffiti CMS Events Plugin: Version 1.0: Initial Release of Events PluginHeadCounter: HeadCounter 1.2.3 'Razorgore': Added "Raider Post" feature for posting details of a particular raider. Added Default Period option to allow selection of Short, Long or Lifetime...Home Access Plus+: v3.0.0.0: Version 3.0.0.0 Release Change Log: Reconfiguration of the web.config Ability to add additional links to homepage via web.config Ability to add...Home Access Plus+: v3.0.1.0: Version 3.0.1.0 Release Change Log: Fixed problem with moving File Changes: ~/bin/chs extranet.dll ~/bin/chs extranet.pdbHome Access Plus+: v3.0.2.0: Version 3.0.2.0 Release Change Log: Fixed problem with stylesheet File Changes: ~/chs.masterHRM Core (QL Nhan Su): HRMCore_src: Source of HRMCoreIRC4N00bz: IRC4N00bz v1.0.0.2: There wasn't much updated this weekend. I updated 2 'raw' events. One is all raw messages and the other is events that arn't caught in the dll. ...IronPython Silverlight Sharpdevelop Template: Version 1 Template: Just unzip it into the Sharpdevelop python templates folder For example: C:\Program Files\SharpDevelop\3.0\AddIns\AddIns\BackendBindings\PythonBi...MDownloader: MDownloader-0.15.4.56156: Fixed handling exceptions; previous handling could lead to freezing items state; Fixed validating uploading.com links;OTManager: Activity Log: 2010.02.28 >> Thread Reopened 2010.02.28 >> Re-organized WBD Features/WMBD Features 2010.02.28 >> Project status is active againPicasa Downloader: PicasaDownloader (41175): NOTE: The previous release was accidently the same as the one before that (forgot to rebuild the installer). Changelog: Fixed workitem 10296 (Sav...PicNet Html Table Filter: Version 2.0: Testing w/ JQuery 1.3.2Program Scheduler: Program Scheduler 1.1.4: Release Note: *Bug fix : If the log window is docked and user moves the log window , main window will move too. *Added menu to log window to clear...QueryToGrid Module for DotNetNuke®: QueryToGrid Module version 01.00.00: This is the initial release of this module. Remember... This is just a proof of concept to add AJAX functionality to your DotNetNuke modules.Rainweaver Framework: February 2010 Release: Code drop including an Alpha release of the Entity System. See more information in the Documentation page.RapidWebDev - .NET Enterprise Software Development Infrastructure: ProductManagement Quick Sample 0.1: This is a sample product management application to demonstrate how to develop enterprise software in RapidWebDev. The glossary of the system are ro...Team Foundation Server Revision Labeller for CruiseControl.NET: TFS Labeller for CruiseControl.NET - TFS 2008: ReleaseFirst release of the Team Foundation Server Labeller for CruiseControl.NET. This specific version is bound to TFS 2008 DLLs.ToolSuite.ValidationExpression: 01.00.01.000: first release of the time validation class; the assembly file is ready to use, the documentation ist not complete;VCC: Latest build, v2.1.30228.0: Automatic drop of latest buildWatchersNET CKEditor™ Provider for DotNetNuke: CKEditor Provider 1.7.00: Whats New FileBrowser: Non Admin Users will only see a User Sub folder (..\Portals\0\userfiles\UserName) CKFinder: Non Admin Users will only see ...Watermarker: Watermarker: first public version. can build watermark only in left top corner on one image at once.While You Were Away - WPF Screensaver: Initial Release: This is the code released when the article went live.Most Popular ProjectsMetaSharpRawrWBFS ManagerAJAX Control ToolkitMicrosoft SQL Server Product Samples: DatabaseSilverlight ToolkitWindows Presentation Foundation (WPF)Microsoft SQL Server Community & SamplesASP.NETDotNetNuke® Community EditionMost Active ProjectsRawrBlogEngine.NETMapWindow GISCommon Context Adapterspatterns & practices – Enterprise LibrarySharpMap - Geospatial Application Framework for the CLRSLARToolkit - Silverlight Augmented Reality ToolkitDiffPlex - a .NET Diff GeneratorRapid Entity Framework. (ORM). CTP 2jQuery Library for SharePoint Web Services

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Creating a dynamic proxy generator – Part 1 – Creating the Assembly builder, Module builder and cach

- by SeanMcAlinden

I’ve recently started a project with a few mates to learn the ins and outs of Dependency Injection, AOP and a number of other pretty crucial patterns of development as we’ve all been using these patterns for a while but have relied totally on third part solutions to do the magic. We thought it would be interesting to really get into the details by rolling our own IoC container and hopefully learn a lot on the way, and you never know, we might even create an excellent framework. The open source project is called Rapid IoC and is hosted at http://rapidioc.codeplex.com/ One of the most interesting tasks for me is creating the dynamic proxy generator for enabling Aspect Orientated Programming (AOP). In this series of articles, I’m going to track each step I take for creating the dynamic proxy generator and I’ll try my best to explain what everything means - mainly as I’ll be using Reflection.Emit to emit a fair amount of intermediate language code (IL) to create the proxy types at runtime which can be a little taxing to read. It’s worth noting that building the proxy is without a doubt going to be slightly painful so I imagine there will be plenty of areas I’ll need to change along the way. Anyway lets get started… Part 1 - Creating the Assembly builder, Module builder and caching mechanism Part 1 is going to be a really nice simple start, I’m just going to start by creating the assembly, module and type caches. The reason we need to create caches for the assembly, module and types is simply to save the overhead of recreating proxy types that have already been generated, this will be one of the important steps to ensure that the framework is fast… kind of important as we’re calling the IoC container ‘Rapid’ – will be a little bit embarrassing if we manage to create the slowest framework. The Assembly builder The assembly builder is what is used to create an assembly at runtime, we’re going to have two overloads, one will be for the actual use of the proxy generator, the other will be mainly for testing purposes as it will also save the assembly so we can use Reflector to examine the code that has been created. Here’s the code: DynamicAssemblyBuilder using System; using System.Reflection; using System.Reflection.Emit; namespace Rapid.DynamicProxy.Assembly { /// <summary> /// Class for creating an assembly builder. /// </summary> internal static class DynamicAssemblyBuilder { #region Create /// <summary> /// Creates an assembly builder. /// </summary> /// <param name="assemblyName">Name of the assembly.</param> public static AssemblyBuilder Create(string assemblyName) { AssemblyName name = new AssemblyName(assemblyName); AssemblyBuilder assembly = AppDomain.CurrentDomain.DefineDynamicAssembly( name, AssemblyBuilderAccess.Run); DynamicAssemblyCache.Add(assembly); return assembly; } /// <summary> /// Creates an assembly builder and saves the assembly to the passed in location. /// </summary> /// <param name="assemblyName">Name of the assembly.</param> /// <param name="filePath">The file path.</param> public static AssemblyBuilder Create(string assemblyName, string filePath) { AssemblyName name = new AssemblyName(assemblyName); AssemblyBuilder assembly = AppDomain.CurrentDomain.DefineDynamicAssembly( name, AssemblyBuilderAccess.RunAndSave, filePath); DynamicAssemblyCache.Add(assembly); return assembly; } #endregion } } So hopefully the above class is fairly explanatory, an AssemblyName is created using the passed in string for the actual name of the assembly. An AssemblyBuilder is then constructed with the current AppDomain and depending on the overload used, it is either just run in the current context or it is set up ready for saving. It is then added to the cache. DynamicAssemblyCache using System.Reflection.Emit; using Rapid.DynamicProxy.Exceptions; using Rapid.DynamicProxy.Resources.Exceptions; namespace Rapid.DynamicProxy.Assembly { /// <summary> /// Cache for storing the dynamic assembly builder. /// </summary> internal static class DynamicAssemblyCache { #region Declarations private static object syncRoot = new object(); internal static AssemblyBuilder Cache = null; #endregion #region Adds a dynamic assembly to the cache. /// <summary> /// Adds a dynamic assembly builder to the cache. /// </summary> /// <param name="assemblyBuilder">The assembly builder.</param> public static void Add(AssemblyBuilder assemblyBuilder) { lock (syncRoot) { Cache = assemblyBuilder; } } #endregion #region Gets the cached assembly /// <summary> /// Gets the cached assembly builder. /// </summary> /// <returns></returns> public static AssemblyBuilder Get { get { lock (syncRoot) { if (Cache != null) { return Cache; } } throw new RapidDynamicProxyAssertionException(AssertionResources.NoAssemblyInCache); } } #endregion } } The cache is simply a static property that will store the AssemblyBuilder (I know it’s a little weird that I’ve made it public, this is for testing purposes, I know that’s a bad excuse but hey…) There are two methods for using the cache – Add and Get, these just provide thread safe access to the cache. The Module Builder The module builder is required as the create proxy classes will need to live inside a module within the assembly. Here’s the code: DynamicModuleBuilder using System.Reflection.Emit; using Rapid.DynamicProxy.Assembly; namespace Rapid.DynamicProxy.Module { /// <summary> /// Class for creating a module builder. /// </summary> internal static class DynamicModuleBuilder { /// <summary> /// Creates a module builder using the cached assembly. /// </summary> public static ModuleBuilder Create() { string assemblyName = DynamicAssemblyCache.Get.GetName().Name; ModuleBuilder moduleBuilder = DynamicAssemblyCache.Get.DefineDynamicModule (assemblyName, string.Format("{0}.dll", assemblyName)); DynamicModuleCache.Add(moduleBuilder); return moduleBuilder; } } } As you can see, the module builder is created on the assembly that lives in the DynamicAssemblyCache, the module is given the assembly name and also a string representing the filename if the assembly is to be saved. It is then added to the DynamicModuleCache. DynamicModuleCache using System.Reflection.Emit; using Rapid.DynamicProxy.Exceptions; using Rapid.DynamicProxy.Resources.Exceptions; namespace Rapid.DynamicProxy.Module { /// <summary> /// Class for storing the module builder. /// </summary> internal static class DynamicModuleCache { #region Declarations private static object syncRoot = new object(); internal static ModuleBuilder Cache = null; #endregion #region Add /// <summary> /// Adds a dynamic module builder to the cache. /// </summary> /// <param name="moduleBuilder">The module builder.</param> public static void Add(ModuleBuilder moduleBuilder) { lock (syncRoot) { Cache = moduleBuilder; } } #endregion #region Get /// <summary> /// Gets the cached module builder. /// </summary> /// <returns></returns> public static ModuleBuilder Get { get { lock (syncRoot) { if (Cache != null) { return Cache; } } throw new RapidDynamicProxyAssertionException(AssertionResources.NoModuleInCache); } } #endregion } } The DynamicModuleCache is very similar to the assembly cache, it is simply a statically stored module with thread safe Add and Get methods. The DynamicTypeCache To end off this post, I’m going to create the cache for storing the generated proxy classes. I’ve spent a fair amount of time thinking about the type of collection I should use to store the types and have finally decided that for the time being I’m going to use a generic dictionary. This may change when I can actually performance test the proxy generator but the time being I think it makes good sense in theory, mainly as it pretty much maintains it’s performance with varying numbers of items – almost constant (0)1. Plus I won’t ever need to loop through the items which is not the dictionaries strong point. Here’s the code as it currently stands: DynamicTypeCache using System; using System.Collections.Generic; using System.Security.Cryptography; using System.Text; namespace Rapid.DynamicProxy.Types { /// <summary> /// Cache for storing proxy types. /// </summary> internal static class DynamicTypeCache { #region Declarations static object syncRoot = new object(); public static Dictionary<string, Type> Cache = new Dictionary<string, Type>(); #endregion /// <summary> /// Adds a proxy to the type cache. /// </summary> /// <param name="type">The type.</param> /// <param name="proxy">The proxy.</param> public static void AddProxyForType(Type type, Type proxy) { lock (syncRoot) { Cache.Add(GetHashCode(type.AssemblyQualifiedName), proxy); } } /// <summary> /// Tries the type of the get proxy for. /// </summary> /// <param name="type">The type.</param> /// <returns></returns> public static Type TryGetProxyForType(Type type) { lock (syncRoot) { Type proxyType; Cache.TryGetValue(GetHashCode(type.AssemblyQualifiedName), out proxyType); return proxyType; } } #region Private Methods private static string GetHashCode(string fullName) { SHA1CryptoServiceProvider provider = new SHA1CryptoServiceProvider(); Byte[] buffer = Encoding.UTF8.GetBytes(fullName); Byte[] hash = provider.ComputeHash(buffer, 0, buffer.Length); return Convert.ToBase64String(hash); } #endregion } } As you can see, there are two public methods, one for adding to the cache and one for getting from the cache. Hopefully they should be clear enough, the Get is a TryGet as I do not want the dictionary to throw an exception if a proxy doesn’t exist within the cache. Other than that I’ve decided to create a key using the SHA1CryptoServiceProvider, this may change but my initial though is the SHA1 algorithm is pretty fast to put together using the provider and it is also very unlikely to have any hashing collisions. (there are some maths behind how unlikely this is – here’s the wiki if you’re interested http://en.wikipedia.org/wiki/SHA_hash_functions) Anyway, that’s the end of part 1 – although I haven’t started any of the fun stuff (by fun I mean hairpulling, teeth grating Relfection.Emit style fun), I’ve got the basis of the DynamicProxy in place so all we have to worry about now is creating the types, interceptor classes, method invocation information classes and finally a really nice fluent interface that will abstract all of the hard-core craziness away and leave us with a lightning fast, easy to use AOP framework. Hope you find the series interesting. All of the source code can be viewed and/or downloaded at our codeplex site - http://rapidioc.codeplex.com/ Kind Regards, Sean.

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Silverlight 4 Training Kit

- by ScottGu

We recently released a new free Silverlight 4 Training Kit that walks you through building business applications with Silverlight 4. You can browse the training kit online or alternatively download an entire offline version of the training kit. The training material is structured on teaching how to use the new Silverlight 4 features to build an end to end business application. The training kit includes 8 modules, 25 videos, and several hands on labs. Below is a breakdown and links to all of the content. [In addition to blogging, I am also now using Twitter for quick updates and to share links. Follow me at: twitter.com/scottgu] Module 1: Introduction Click here to watch this module. In this video John Papa and Ian Griffiths discuss the key areas that the Building Business Applications with Silverlight 4 course focuses on. This module is the overview of the course and covers many key scenarios that are faced when building business applications, and how Silverlight can help address them. Module 2: WCF RIA Services Click here to explore this module. In this lab, you will create a web site for managing conferences that will be the basis for the other labs in this course. Don’t worry if you don’t complete a particular lab in the series – all lab manual instructions are accompanied by completed solutions, so you can either build your own solution from start to finish, or dive straight in at any point using the solutions provided as a starting point. In this lab you will learn how to set up WCF RIA Services, create bindings to the domain context, filter using the domain data source, and create domain service queries. Online Link Download Source Download Lab Document Videos Module 2.1 - WCF RIA Services Ian Griffiths sets up the Entity Framework and WCF RIA Services for the sample Event Manager application for the course. He covers how to set up the services, how the Domain Services work and the role that the DomainContext plays in the sample application. He also reviews the metadata classes and integrating the navigation framework. Module 2.2 – Using WCF RIA Services to Edit Entities Ian Griffiths discusses how he adds the ability to edit and create individual entities with the features built into WCF RIA Services into the sample Event Manager application. He covers data binding fundamentals, IQueryable, LINQ, the DomainDataSource, navigation to a single entity using the navigation framework, and how to use the Visual Studio designer to do much of the work . Module 2.3 – Showing Master/Details Records Using WCF RIA Services Ian Griffiths reviews how to display master/detail records for the sample Event Manager application using WCF RIA Services. He covers how to use the Include attribute to indicate which elements to serialize back to the client. Ian also demonstrates how to use the Data Sources window in the designer to add and bind controls to specific data elements. He wraps up by showing how to create custom services to the Domain Services. Module 3 – Authentication, Validation, MVVM, Commands, Implicit Styles and RichTextBox Click here to visit this module. This lab demonstrates how to build a login screen, integrate ASP.NET authentication, and perform validation on data elements. Model-View-ViewModel (MVVM) is introduced and used in this lab as a pattern to help separate the UI and business logic. You will also learn how to use implicit styling and the new RichTextBox control. Online Link Download Source Download Lab Document Videos Module 3.1 – Authentication Ian Griffiths covers how to integrate a login screen and authentication into the sample Event Manager application. Ian shows how to use the ASP.NET authentication and integrate it into WCF RIA Services and the Silverlight presentation layer. Module 3.2 – MVVM Ian Griffiths covers how to Model-View-ViewModel (MVVM) patterns into the sample Event Manager application. He discusses why MVVM exists, what separated presentation means, and why it is important. He shows how to connect the View to the ViewModel, why data binding is important in this symbiosis, and how everything fits together in the overall application. Module 3.3 –Validation Ian Griffiths discusses how validation of user input can be integrated into the sample Event Manager application. He demonstrates how to use the DataAnnotations, the INotifyDataErrorInfo interface, binding markup extensions, and WCF RIA Services in concert to achieve great validation in the sample application. He discusses how this technique allows for property level validation, entity level validation, and asynchronous server side validation. Module 3.4 – Implicit Styles Ian Griffiths discusses how why implicit styles are important and how they can be integrated into the sample Event Manager application. He shows how implicit styles defined in a resource dictionary can be applied to all elements of a particular kind throughout the application. Module 3.5 – RichTextBox Ian Griffiths discusses how the new RichTextBox control and it can be integrated into the sample Event Manager application. He demonstrates how the RichTextBox can provide editing for the event information and how it can display the rich text for selection and copying. Module 4 – User Profiles, Drop Targets, Webcam and Clipboard Click here to visit this module. This lab builds new features into the sample application to take the user's photo. It teaches you how to use the webcam to capture an image, use Silverlight as a drop target, and take advantage of programmatic access to the clipboard. Link Download Source Download Lab Document Videos Module 4.1 – Webcam Ian Griffiths demonstrates how the webcam adds value to the sample Event Manager application by capturing an image of the attendee. He discusses the VideoCaptureDevice, the CaptureDviceConfiguration, and the CaptureSource classes and how they allow audio and video to be captured so you can grab an image from the capture device and save it. Module 4.2 - Drag and Drop in Silverlight Ian Griffiths demonstrates how to capture and handle the Drop in the sample Event Manager application so the user can drag a photo from a file and drop it into the application. Ian reviews the AllowDrop property, the Drop event, how to access the file that can be dropped, and the other drag related events. He also reviews how to make this work across browsers and the challenges for this. Module 5 – Schedule Planner and Right Mouse Click Click here to visit this module. This lab builds on the application to allow grouping in the DataGrid and implement right mouse click features to add context menu support. Link Download Source Download Lab Document Videos Module 5.1 – Grouping and Binding Ian Griffiths demonstrates how to use the grouping features for data binding in the DataGrid and how it applies to the sample Event Manager application. He reviews the role of the CollectionViewSource in grouping, customizing the templates for headers, and how to work with grouping with ItemsControls. Module 5.2 – Layout Visual States Ian Griffiths demonstrates how to use the Fluid UI animation support for visual states in the ListBox control DataGrid and how it applies to the sample Event Manager application. He reviews the 3 visual states of BeforeLoaded, AfterLoaded, and BeforeUnloaded. Module 5.3 – Right Mouse Click Ian Griffiths demonstrates how to add support for handling the right mouse button click event to display a context menu for the Event Manager application. He demonstrates how to handle the event, show a custom context menu control, and integrate it into the scheduling portion of the application. Module 6 – Printing the Schedule Click here to visit this module. This lab teaches how to use the new printing features in Silverlight 4. The lab walks through the PrintDocument class and the ViewBox control, while showing how to print multiple pages of content using them. Link Download Source Download Lab Document Videos Module 6.1 – Printing and the Viewbox Ian Griffiths demonstrates how to add the ability to print the schedule to the sample Event Manager application. He walks through the importance of the PrintDocument class and its members. He also shows how to handle printing the visual tree and how the ViewBox control can help. Module 6.2 – Multi Page Printing Ian Griffiths expands on his printing discussion by showing how to handle printing multiple pages of content for the sample Event Manager application. He shows how to paginate the content and points out various tips to keep in mind when determining the printable area. Module 7 – Running the Event Dashboard Out of Browser Click here to visit this module. This lab builds a dashboard for the sample application while explaining the fundamentals of the out of browser features, how to handle authentication, displaying notifications (toasts), and how to use native integration to use COM Interop with Silverlight. Link Download Source Download Lab Document Videos Module 7.1 – Out of Browser Ian Griffiths discusses the role of an Out of Browser application for administrators to manage the events and users in the sample Event Manager application. He discusses several reasons why out of browser applications may better suit your needs including custom chrome, toasts, window placement, cross domain access, and file access. He demonstrates the basic technique to take your application and make it work out of browser using the tools. Module 7.2 – NotificationWindow (Toasts) for Elevated Trust Out of Browser Applications Ian Griffiths discusses the how toasts can be used in the sample Event Manager application to show information that may require the user's attention. Ian covers how to create a toast using the NotificationWindow, security implications, and how to make the toast appear as needed. Module 7.3 – Out of Browser Window Placement Ian Griffiths discusses the how to manage the window positioning when building an out of browser application, handling the windows state, and controlling and handling activation of the window. Module 7.4 – Out of Browser Elevated Trust Application Overview Ian Griffiths discusses the implications of creating trusted out of browser application for the Event Manager sample application. He reviews why you might want to use elevated trust, what features is opens to you, and how to take advantage of them. Topics Ian covers include the dynamic keyword in C# 4, the AutomationFactory class, the API to check if you are in a trusted application, and communicating with Excel. Module 8 – Advanced Out of Browser and MEF Click here to visit this module. This hands-on lab walks through the creation of a trusted out of browser application and the new functionality that comes with that. You will learn to use COM Automation, handle the window closing event, set custom window chrome, digitally sign your Silverlight out of browser trusted application, create a silent install option, and take advantage of MEF. Link Download Source Download Lab Document Videos Module 8.1 – Custom Window Chrome for Elevated Trust Out of Browser Applications Ian Griffiths discusses how to replace the standard operating system window chrome with customized chrome for an elevated trusted out of browser application. He covers how it is important to handle close, resize, minimize, and maximize events. Ian mentions that the tooling was not ready when he shot this video, but the good news is that the tooling now supports setting the custom chrome directly from the property page for the Silverlight application. Module 8.2 – Window Closing Event for Out of Browser Applications Ian Griffiths discusses the WindowClosing event and how to handle and optionally cancel the event. Module 8.3 – Silent Install of Out of Browser Applications Ian Griffiths discusses how to use the SLLauncher executable to install an out of browser application. He discusses the optional command line switches that can be set including how the emulate switch can help you emulate the install process. Ian also shows how to setup a shortcut for the application and tell the application where it should look for future updates online. Module 8.4 – Digitally Signing Out of Browser Application Ian Griffiths discusses how and why to digitally sign an out of browser application using the signtool program. He covers what trusted certificates are, the implications of signing (or not signing), and the effect on the user experience. Module 8.5 – The Value of MEF with Silverlight Ian Griffiths discusses what MEF is, how your application can benefit from it, and the fundamental features it puts at your disposal. He covers the 3 step import, export and compose process as well as how to dynamically import XAP files using MEF. Summary As you can probably tell from the long list above – this series contains a ton of great content, and hopefully provides a nice end-to-end walkthrough that helps explain how to take advantage of Silverlight 4 (and all its new features). Hope this helps, Scott

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Customize the SimpleMembership in ASP.NET MVC 4.0

- by thangchung

As we know, .NET 4.5 have come up to us, and come along with a lot of new interesting features as well. Visual Studio 2012 was also introduced some days ago. They made us feel very happy with cool improvement along with us. Performance when loading code editor is very good at the moment (immediate after click on the solution). I explore some of cool features at these days. Some of them like Json.NET integrated in ASP.NET MVC 4.0, improvement on asynchronous action, new lightweight theme on Visual Studio, supporting very good on mobile development, improvement on authentication… I reviewed them, and found out that in this version of .NET Microsoft was not only developed new feature that suggest from community but also focused on improvement performance of existing features or components. Besides that, they also opened source more projects, like Entity Framework, Reactive Extensions, ASP.NET Web Stack… At the moment, I feel Microsoft want to open source more and more their projects. Today, I am going to dive in deep on new SimpleMembership model. It is really good because in this security model, Microsoft actually focus on development needs. As we know, in the past, they introduce some of provider supplied for coding security like MembershipProvider, RoleProvider… I don’t need to talk but everyone that have ever used it know that they were actually hard to use, and not easy to maintain and unit testing. Why? Because every time you inherit it, you need to override all methods inside it. Some people try to abstract it by introduce more method with virtual keyword, and try to implement basic behavior, so in the subclass we only need to override the method that need for their business. But to me, it’s only the way to work around. ASP.NET team and Web Matrix knew about it, so they built the new features based on existing components on .NET framework. And one of component that comes to us is SimpleMembership and SimpleRole. They implemented the Façade pattern on the top of those, and called it is WebSecurity. In the web, we can call WebSecurity anywhere we want, and make a call to inside wrapper of it. I read a lot of them on web blog, on technical news, on MSDN as well. Matthew Osborn had an excellent article about it at his blog. Jon Galloway had an article like this at here. He analyzed why old membership provider not fixed well to ASP.NET MVC and how to get over it. Those are very good to me. It introduced to me about how to doing SimpleMembership on it, how to doing it on new ASP.NET MVC web application. But one thing, those didn’t tell me was how to doing it on existing security model (that mean we already had Users and Roles on legacy system, and how we can integrate it to this system), that’s a reason I will introduce it today. I have spent couples of hours to see what’s inside this, and try to make one example to clarify my concern. And it’s lucky that I can make it working well.The first thing, we need to create new ASP.NET MVC application on Visual Studio 2012. We need to choose Internet type for this web application. ASP.NET MVC actually creates all needs components for the basic membership and basic role. The cool feature is DoNetOpenAuth come along with it that means we can log-in using facebook, twitter or Windows Live if you want. But it’s only for LocalDb, so we need to change it to fix with existing database model on SQL Server. The next step we have to make SimpleMembership can understand which database we use and show it which column need to point to for the ID and UserName. I really like this feature because SimpleMembership on need to know about the ID and UserName, and they don’t care about rest of it. I assume that we have an existing database model like So we will point it in code like The codes for it, we put on InitializeSimpleMembershipAttribute like [AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, AllowMultiple = false, Inherited = true)] public sealed class InitializeSimpleMembershipAttribute : ActionFilterAttribute { private static SimpleMembershipInitializer _initializer; private static object _initializerLock = new object(); private static bool _isInitialized; public override void OnActionExecuting(ActionExecutingContext filterContext) { // Ensure ASP.NET Simple Membership is initialized only once per app start LazyInitializer.EnsureInitialized(ref _initializer, ref _isInitialized, ref _initializerLock); } private class SimpleMembershipInitializer { public SimpleMembershipInitializer() { try { WebSecurity.InitializeDatabaseConnection("DefaultDb", "User", "Id", "UserName", autoCreateTables: true); } catch (Exception ex) { throw new InvalidOperationException("The ASP.NET Simple Membership database could not be initialized. For more information, please see http://go.microsoft.com/fwlink/?LinkId=256588", ex); } } } }And decorating it in the AccountController as below [Authorize] [InitializeSimpleMembership] public class AccountController : ControllerIn this case, assuming that we need to override the ValidateUser to point this to existing User database table, and validate it. We have to add one more class like public class CustomAdminMembershipProvider : SimpleMembershipProvider { // TODO: will do a better way private const string SELECT_ALL_USER_SCRIPT = "select * from [dbo].[User]private where UserName = '{0}'"; private readonly IEncrypting _encryptor; private readonly SimpleSecurityContext _simpleSecurityContext; public CustomAdminMembershipProvider(SimpleSecurityContext simpleSecurityContext) : this(new Encryptor(), new SimpleSecurityContext("DefaultDb")) { } public CustomAdminMembershipProvider(IEncrypting encryptor, SimpleSecurityContext simpleSecurityContext) { _encryptor = encryptor; _simpleSecurityContext = simpleSecurityContext; } public override bool ValidateUser(string username, string password) { if (string.IsNullOrEmpty(username)) { throw new ArgumentException("Argument cannot be null or empty", "username"); } if (string.IsNullOrEmpty(password)) { throw new ArgumentException("Argument cannot be null or empty", "password"); } var hash = _encryptor.Encode(password); using (_simpleSecurityContext) { var users = _simpleSecurityContext.Users.SqlQuery( string.Format(SELECT_ALL_USER_SCRIPT, username)); if (users == null && !users.Any()) { return false; } return users.FirstOrDefault().Password == hash; } } }SimpleSecurityDataContext at here public class SimpleSecurityContext : DbContext { public DbSet<User> Users { get; set; } public SimpleSecurityContext(string connStringName) : base(connStringName) { this.Configuration.LazyLoadingEnabled = true; this.Configuration.ProxyCreationEnabled = false; } protected override void OnModelCreating(DbModelBuilder modelBuilder) { base.OnModelCreating(modelBuilder); modelBuilder.Configurations.Add(new UserMapping()); } }And Mapping for User as below public class UserMapping : EntityMappingBase<User> { public UserMapping() { this.Property(x => x.UserName); this.Property(x => x.DisplayName); this.Property(x => x.Password); this.Property(x => x.Email); this.ToTable("User"); } }One important thing, you need to modify the web.config to point to our customize SimpleMembership <membership defaultProvider="AdminMemberProvider" userIsOnlineTimeWindow="15"> <providers> <clear/> <add name="AdminMemberProvider" type="CIK.News.Web.Infras.Security.CustomAdminMembershipProvider, CIK.News.Web.Infras" /> </providers> </membership> <roleManager enabled="false"> <providers> <clear /> <add name="AdminRoleProvider" type="CIK.News.Web.Infras.Security.AdminRoleProvider, CIK.News.Web.Infras" /> </providers> </roleManager>The good thing at here is we don’t need to modify the code on AccountController. We only need to modify on SimpleMembership and Simple Role (if need). Now build all solutions, run it. We should see a screen like thisIf I login to Twitter button at the bottom of this page, we will be transfer to twitter authentication pageYou have to waiting for a moment Afterwards it will transfer you back to your admin screenYou can find all source codes at my MSDN code. I will really happy if you guys feel free to put some comments as below. It will be helpful to improvement my code in the future. Thank for all your readings.

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Visual Studio 2010 Extension Manager (and the new VS 2010 PowerCommands Extension)

- by ScottGu

This is the twenty-third in a series of blog posts I’m doing on the VS 2010 and .NET 4 release. Today’s blog post covers some of the extensibility improvements made in VS 2010 – as well as a cool new "PowerCommands for Visual Studio 2010” extension that Microsoft just released (and which can be downloaded and used for free). [In addition to blogging, I am also now using Twitter for quick updates and to share links. Follow me at: twitter.com/scottgu] Extensibility in VS 2010 VS 2010 provides a much richer extensibility model than previous releases. Anyone can build extensions that add, customize, and light-up the Visual Studio 2010 IDE, Code Editors, Project System and associated Designers. VS 2010 Extensions can be created using the new MEF (Managed Extensibility Framework) which is built-into .NET 4. You can learn more about how to create VS 2010 extensions from this this blog post from the Visual Studio Team Blog. VS 2010 Extension Manager Developers building extensions can distribute them on their own (via their own web-sites or by selling them). Visual Studio 2010 also now includes a built-in “Extension Manager” within the IDE that makes it much easier for developers to find, download, and enable extensions online. You can launch the “Extension Manager” by selecting the Tools->Extension Manager menu option: This loads an “Extension Manager” dialog which accesses an “online gallery” at Microsoft, and then populates a list of available extensions that you can optionally download and enable within your copy of Visual Studio: There are already hundreds of cool extensions populated within the online gallery. You can browse them by category (use the tree-view on the top-left to filter them). Clicking “download” on any of the extensions will download, install, and enable it. PowerCommands for Visual Studio 2010 This weekend Microsoft released the free PowerCommands for Visual Studio 2010 extension to the online gallery. You can learn more about it here, and download and install it via the “Extension Manager” above (search for PowerCommands to find it). The PowerCommands download adds dozens of useful commands to Visual Studio 2010. Below is a screen-shot of just a few of the useful commands that it adds to the Solution Explorer context menus: Below is a list of all the commands included with this weekend’s PowerCommands for Visual Studio 2010 release: Enable/Disable PowerCommands in Options dialog This feature allows you to select which commands to enable in the Visual Studio IDE. Point to the Tools menu, then click Options. Expand the PowerCommands options, then click Commands. Check the commands you would like to enable. Note: All power commands are initially defaulted Enabled. Format document on save / Remove and Sort Usings on save The Format document on save option formats the tabs, spaces, and so on of the document being saved. It is equivalent to pointing to the Edit menu, clicking Advanced, and then clicking Format Document. The Remove and sort usings option removes unused using statements and sorts the remaining using statements in the document being saved. Note: The Remove and sort usings option is only available for C# documents. Format document on save and Remove and sort usings both are initially defaulted OFF. Clear All Panes This command clears all output panes. It can be executed from the button on the toolbar of the Output window. Copy Path This command copies the full path of the currently selected item to the clipboard. It can be executed by right-clicking one of these nodes in the Solution Explorer: The solution node; A project node; Any project item node; Any folder. Email CodeSnippet To email the lines of text you select in the code editor, right-click anywhere in the editor and then click Email CodeSnippet. Insert Guid Attribute This command adds a Guid attribute to a selected class. From the code editor, right-click anywhere within the class definition, then click Insert Guid Attribute. Show All Files This command shows the hidden files in all projects displayed in the Solution Explorer when the solution node is selected. It enhances the Show All Files button, which normally shows only the hidden files in the selected project node. Undo Close This command reopens a closed document , returning the cursor to its last position. To reopen the most recently closed document, point to the Edit menu, then click Undo Close. Alternately, you can use the CtrlShiftZ shortcut. To reopen any other recently closed document, point to the View menu, click Other Windows, and then click Undo Close Window. The Undo Close window appears, typically next to the Output window. Double-click any document in the list to reopen it. Collapse Projects This command collapses a project or projects in the Solution Explorer starting from the root selected node. Collapsing a project can increase the readability of the solution. This command can be executed from three different places: solution, solution folders and project nodes respectively. Copy Class This command copies a selected class entire content to the clipboard, renaming the class. This command is normally followed by a Paste Class command, which renames the class to avoid a compilation error. It can be executed from a single project item or a project item with dependent sub items. Paste Class This command pastes a class entire content from the clipboard, renaming the class to avoid a compilation error. This command is normally preceded by a Copy Class command. It can be executed from a project or folder node. Copy References This command copies a reference or set of references to the clipboard. It can be executed from the references node, a single reference node or set of reference nodes. Paste References This command pastes a reference or set of references from the clipboard. It can be executed from different places depending on the type of project. For CSharp projects it can be executed from the references node. For Visual Basic and Website projects it can be executed from the project node. Copy As Project Reference This command copies a project as a project reference to the clipboard. It can be executed from a project node. Edit Project File This command opens the MSBuild project file for a selected project inside Visual Studio. It combines the existing Unload Project and Edit Project commands. Open Containing Folder This command opens a Windows Explorer window pointing to the physical path of a selected item. It can be executed from a project item node Open Command Prompt This command opens a Visual Studio command prompt pointing to the physical path of a selected item. It can be executed from four different places: solution, project, folder and project item nodes respectively. Unload Projects This command unloads all projects in a solution. This can be useful in MSBuild scenarios when multiple projects are being edited. This command can be executed from the solution node. Reload Projects This command reloads all unloaded projects in a solution. It can be executed from the solution node. Remove and Sort Usings This command removes and sort using statements for all classes given a project. It is useful, for example, in removing or organizing the using statements generated by a wizard. This command can be executed from a solution node or a single project node. Extract Constant This command creates a constant definition statement for a selected text. Extracting a constant effectively names a literal value, which can improve readability. This command can be executed from the code editor by right-clicking selected text. Clear Recent File List This command clears the Visual Studio recent file list. The Clear Recent File List command brings up a Clear File dialog which allows any or all recent files to be selected. Clear Recent Project List This command clears the Visual Studio recent project list. The Clear Recent Project List command brings up a Clear File dialog which allows any or all recent projects to be selected. Transform Templates This command executes a custom tool with associated text templates items. It can be executed from a DSL project node or a DSL folder node. Close All This command closes all documents. It can be executed from a document tab. How to temporarily disable extensions Extensions provide a great way to make Visual Studio even more powerful, and can help improve your overall productivity. One thing to keep in mind, though, is that extensions run within the Visual Studio process (DevEnv.exe) and so a bug within an extension can impact both the stability and performance of Visual Studio. If you ever run into a situation where things seem slower than they should, or if you crash repeatedly, please temporarily disable any installed extensions and see if that fixes the problem. You can do this for extensions that were installed via the online gallery by re-running the extension manager (using the Tools->Extension Manager menu option) and by selecting the “Installed Extensions” node on the top-left of the dialog – and then by clicking “Disable” on any of the extensions within your installed list: Hope this helps, Scott

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