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• Web service client receiving generic FaultException rather than FaultException<T>

  - by Junto

  I am connecting to a Java Axis2 web service using a .NET web service client. The client itself targets the .NET 3.5 framework. The application that wraps the client DLL is 2.0. I'm not sure if that has any bearing. I have been given the WSDL and XSDs by email. From those I have built my proxy class using svcutil. Although I am able to successfully send messages, I am unable to pick up the correct faults when something goes wrong. In the example below, errors are always being picked up by the generic FaultException. catch (FaultException<InvoiceErrorType> fex) { OnLog(enLogLevel.ERROR, fex.Detail.ErrorDescription); } catch (FaultException gfex) { OnLog(enLogLevel.ERROR, gfex.Message); } The proxy client appears to have the appropriate attributes for the FaultContract: // CODEGEN: Generating message contract since the operation SendInvoiceProvider_Prod is neither RPC nor document wrapped. [OperationContractAttribute(Action = "https://private/SendInvoiceProvider", ReplyAction = "*")] [FaultContractAttribute(typeof(InvoiceErrorType), Action = "https://private/SendInvoiceProvider", Name = "InvoiceError", Namespace = "urn:company:schema:entities:base")] [XmlSerializerFormatAttribute(SupportFaults = true)] [ServiceKnownTypeAttribute(typeof(ItemDetail))] [ServiceKnownTypeAttribute(typeof(Supplier))] OutboundComponent.SendInvoiceProviderResponse SendInvoiceProvider_Prod(OutboundComponent.SendInvoiceProvider_Request request); I have enabled tracing and I can see the content of the fault coming back, but .NET is not recognizing it as an InvoiceError. The SOAP fault in full is: <soapenv:Fault> <faultcode xmlns="">soapenv:Client</faultcode> <faultstring xmlns="">Message found to be invalid</faultstring> <faultactor xmlns="">urn:SendInvoiceProvider</faultactor> <detail xmlns=""> <InvoiceError xmlns="urn:company:schema:entities:common:invoiceerror:v01"> <ErrorID>100040</ErrorID> <ErrorType>UNEXPECTED</ErrorType> <ErrorDescription>&lt;![CDATA[&lt;error xmlns="urn:company:schema:errordetail:v01"&gt;&lt;errorCode&gt;1000&lt;/errorCode&gt;&lt;highestSeverity&gt;8&lt;/highestSeverity&gt;&lt;errorDetails count="1"&gt;&lt;errorDetail&gt;&lt;errorType&gt;1&lt;/errorType&gt;&lt;errorSeverity&gt;8&lt;/errorSeverity&gt;&lt;errorDescription&gt;cvc-complex-type.2.4.a: Invalid content was found starting with element 'CompanyName'. One of '{"urn:company:schema:sendinvoice:rq:v01":RoleType}' is expected.&lt;/errorDescription&gt;&lt;errorNamespace&gt;urn:company:schema:sendinvoice:rq:v01&lt;/errorNamespace&gt;&lt;errorNode&gt;CompanyName&lt;/errorNode&gt;&lt;errorLine&gt;1&lt;/errorLine&gt;&lt;errorColumn&gt;2556&lt;/errorColumn&gt;&lt;errorXPath/&gt;&lt;errorSource/&gt;&lt;/errorDetail&gt;&lt;/errorDetails&gt;&lt;/error&gt;]]&gt;</ErrorDescription> <TimeStamp>2010-05-04T21:12:10Z</TimeStamp> </InvoiceError> </detail> </soapenv:Fault> I have noticed the namespace defined on the error: <InvoiceError xmlns="urn:company:schema:entities:common:invoiceerror:v01"> This is nowhere to be seen in the generated proxy class, nor in the WSDLs. The interface WSDL defines the error schema namespace as such: <xs:import namespace="urn:company:schema:entities:base" schemaLocation="InvoiceError.xsd"/> Could this be the reason why the .NET client is not able to parse the typed Fault Exception correctly? I have no control over the web service itself. I see no reason why .NET can't talk to a Java Axis2 web service. This user had a similar issue, but the reason for his problem cannot be the same as mine, since I can see the fault detail in the trace: http://stackoverflow.com/questions/864800/does-wcf-faultexceptiont-support-interop-with-a-java-web-service-fault Any help would be gratefully received.

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• Approaches for generic, compile-time safe lazy-load methods

  - by Aaronaught

  Suppose I have created a wrapper class like the following: public class Foo : IFoo { private readonly IFoo innerFoo; public Foo(IFoo innerFoo) { this.innerFoo = innerFoo; } public int? Bar { get; set; } public int? Baz { get; set; } } The idea here is that the innerFoo might wrap data-access methods or something similarly expensive, and I only want its GetBar and GetBaz methods to be invoked once. So I want to create another wrapper around it, which will save the values obtained on the first run. It's simple enough to do this, of course: int IFoo.GetBar() { if ((Bar == null) && (innerFoo != null)) Bar = innerFoo.GetBar(); return Bar ?? 0; } int IFoo.GetBaz() { if ((Baz == null) && (innerFoo != null)) Baz = innerFoo.GetBaz(); return Baz ?? 0; } But it gets pretty repetitive if I'm doing this with 10 different properties and 30 different wrappers. So I figured, hey, let's make this generic: T LazyLoad<T>(ref T prop, Func<IFoo, T> loader) { if ((prop == null) && (innerFoo != null)) prop = loader(innerFoo); return prop; } Which almost gets me where I want, but not quite, because you can't ref an auto-property (or any property at all). In other words, I can't write this: int IFoo.GetBar() { return LazyLoad(ref Bar, f => f.GetBar()); // <--- Won't compile } Instead, I'd have to change Bar to have an explicit backing field and write explicit getters and setters. Which is fine, except for the fact that I end up writing even more redundant code than I was writing in the first place. Then I considered the possibility of using expression trees: T LazyLoad<T>(Expression<Func<T>> propExpr, Func<IFoo, T> loader) { var memberExpression = propExpr.Body as MemberExpression; if (memberExpression != null) { // Use Reflection to inspect/set the property } } This plays nice with refactoring - it'll work great if I do this: return LazyLoad(f => f.Bar, f => f.GetBar()); But it's not actually safe, because someone less clever (i.e. myself in 3 days from now when I inevitably forget how this is implemented internally) could decide to write this instead: return LazyLoad(f => 3, f => f.GetBar()); Which is either going to crash or result in unexpected/undefined behaviour, depending on how defensively I write the LazyLoad method. So I don't really like this approach either, because it leads to the possibility of runtime errors which would have been prevented in the first attempt. It also relies on Reflection, which feels a little dirty here, even though this code is admittedly not performance-sensitive. Now I could also decide to go all-out and use DynamicProxy to do method interception and not have to write any code, and in fact I already do this in some applications. But this code is residing in a core library which many other assemblies depend on, and it seems horribly wrong to be introducing this kind of complexity at such a low level. Separating the interceptor-based implementation from the IFoo interface by putting it into its own assembly doesn't really help; the fact is that this very class is still going to be used all over the place, must be used, so this isn't one of those problems that could be trivially solved with a little DI magic. The last option I've already thought of would be to have a method like: T LazyLoad<T>(Func<T> getter, Action<T> setter, Func<IFoo, T> loader) { ... } This option is very "meh" as well - it avoids Reflection but is still error-prone, and it doesn't really reduce the repetition that much. It's almost as bad as having to write explicit getters and setters for each property. Maybe I'm just being incredibly nit-picky, but this application is still in its early stages, and it's going to grow substantially over time, and I really want to keep the code squeaky-clean. Bottom line: I'm at an impasse, looking for other ideas. Question: Is there any way to clean up the lazy-loading code at the top, such that the implementation will: Guarantee compile-time safety, like the ref version; Actually reduce the amount of code repetition, like the Expression version; and Not take on any significant additional dependencies? In other words, is there a way to do this just using regular C# language features and possibly a few small helper classes? Or am I just going to have to accept that there's a trade-off here and strike one of the above requirements from the list?

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• Embedding generic sql queries into c# program

  - by Pooja Balkundi

  Okay referring to my first question code in the main, I want the user to enter employee name at runtime and then i take this name which user has entered and compare it with the e_name of my emp table , if it exists i want to display all information of that employee , how can I achieve this ? using System; using System.Collections.Generic; using System.Linq; using System.Windows.Forms; using MySql.Data.MySqlClient; namespace ConnectCsharppToMySQL { public class DBConnect { private MySqlConnection connection; private string server; private string database; private string uid; private string password; string name; //Constructor public DBConnect() { Initialize(); } //Initialize values private void Initialize() { server = "localhost"; database = "test"; uid = "root"; password = ""; string connectionString; connectionString = "SERVER=" + server + ";" + "DATABASE=" + database + ";" + "UID=" + uid + ";" + "PASSWORD=" + password + ";"; connection = new MySqlConnection(connectionString); } //open connection to database private bool OpenConnection() { try { connection.Open(); return true; } catch (MySqlException ex) { //When handling errors, you can your application's response based //on the error number. //The two most common error numbers when connecting are as follows: //0: Cannot connect to server. //1045: Invalid user name and/or password. switch (ex.Number) { case 0: MessageBox.Show("Cannot connect to server. Contact administrator"); break; case 1045: MessageBox.Show("Invalid username/password, please try again"); break; } return false; } } //Close connection private bool CloseConnection() { try { connection.Close(); return true; } catch (MySqlException ex) { MessageBox.Show(ex.Message); return false; } } //Insert statement public void Insert() { string query = "INSERT INTO emp (e_name, age) VALUES('Pooja R', '21')"; //open connection if (this.OpenConnection() == true) { //create command and assign the query and connection from the constructor MySqlCommand cmd = new MySqlCommand(query, connection); //Execute command cmd.ExecuteNonQuery(); //close connection this.CloseConnection(); } } //Update statement public void Update() { string query = "UPDATE emp SET e_name='Peachy', age='22' WHERE e_name='Pooja R'"; //Open connection if (this.OpenConnection() == true) { //create mysql command MySqlCommand cmd = new MySqlCommand(); //Assign the query using CommandText cmd.CommandText = query; //Assign the connection using Connection cmd.Connection = connection; //Execute query cmd.ExecuteNonQuery(); //close connection this.CloseConnection(); } } //Select statement public List<string>[] Select() { string query = "SELECT * FROM emp where e_name=(/*I WANT USER ENTERED NAME TO GET INSERTED HERE*/)"; //Create a list to store the result List<string>[] list = new List<string>[3]; list[0] = new List<string>(); list[1] = new List<string>(); list[2] = new List<string>(); //Open connection if (this.OpenConnection() == true) { //Create Command MySqlCommand cmd = new MySqlCommand(query, connection); //Create a data reader and Execute the command MySqlDataReader dataReader = cmd.ExecuteReader(); //Read the data and store them in the list while (dataReader.Read()) { list[0].Add(dataReader["e_id"] + ""); list[1].Add(dataReader["e_name"] + ""); list[2].Add(dataReader["age"] + ""); } //close Data Reader dataReader.Close(); //close Connection this.CloseConnection(); //return list to be displayed return list; } else { return list; } } public static void Main(String[] args) { DBConnect db1 = new DBConnect(); Console.WriteLine("Initializing"); db1.Initialize(); Console.WriteLine("Search :"); Console.WriteLine("Enter the employee name"); db1.name = Console.ReadLine(); db1.Select(); Console.ReadLine(); } } }

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• How to switch to a generic kernel in a headless Ubuntu Server 12.04?

  - by chmike

  I just got a dedicated server with Ubuntu 12.04 installed with a custom compiled kernel. Since I would like to install VirtualBox and this custom kernel doesn't support dynamic module loading (for security) I need to change the kernel. I'm running some Ubuntu servers for years but never palyed with grub and a headless computer. When the command update-grub is run it shows the different kernel it finds. Here is what I see Generating grub.cfg ... Found linux image: /boot/bzImage-3.2.13-xxxx-grs-ipv6-64 Found linux image: /boot/vmlinuz-3.2.0-34-generic Found initrd image: /boot/initrd.img-3.2.0-34-generic No volume groups found done The first one is the active one as seen with uname -r. To me it looks like the second kernel is the one I should use. But I don't know how to configure grub2 to use it. The computer is also configured with a software RAID using mdadm I guess. Never used that before. I don't know if playing with the grub of changing kernel could brake this. What must I do to set the generic kernel as the default one so that I can get VirtualBox running.

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• I have made two template classes,could any one tell me if these things are useful?

  - by soul

  Recently i made two template classes,according to the book "Modern C++ design". I think these classes are useful but no one in my company agree with me,so could any one tell me if these things are useful? The first one is a parameter wrapper,it can package function paramters to a single dynamic object.It looks like TypeList in "Modern C++ design". You can use it like this: some place of your code: int i = 7; bool b = true; double d = 3.3; CParam *p1 = CreateParam(b,i); CParam *p2 = CreateParam(i,b,d); other place of your code: int i = 0; bool b = false; double d = 0.0; GetParam(p1,b,i); GetParam(p2,i,b,d); The second one is a generic callback wrapper,it has some special point compare to other wrappers: 1.This template class has a dynamic base class,which let you use a single type object represent all wrapper objects. 2.It can wrap the callback together with it's parameters,you can excute the callback sometimes later with the parameters. You can use it like this: somewhere of your code: void Test1(int i) { } void Test2(bool b,int i) { } CallbackFunc * p1 = CreateCallback(Test1,3); CallbackFunc * p2 = CreateCallback(Test2,false,99); otherwhere of your code: p1->Excute(); p2->Excute(); Here is a part of the codes: parameter wrapper: class NullType; struct CParam { virtual ~CParam(){} }; template<class T1,class T2> struct CParam2 : public CParam { CParam2(T1 &t1,T2 &t2):v1(t1),v2(t2){} CParam2(){} T1 v1; T2 v2; }; template<class T1> struct CParam2<T1,NullType> : public CParam { CParam2(T1 &t1):v1(t1){} CParam2(){} T1 v1; }; template<class T1> CParam * CreateParam(T1 t1) { return (new CParam2<T1,NullType>(t1)); } template<class T1,class T2> CParam * CreateParam(T1 t1,T2 t2) { return (new CParam2<T1,T2>(t1,t2)); } template<class T1,class T2,class T3> CParam * CreateParam(T1 t1,T2 t2,T3 t3) { CParam2<T2,T3> t(t2,t3); return new CParam2<T1,CParam2<T2,T3> >(t1,t); } template<class T1> void GetParam(CParam *p,T1 &t1) { PARAM1(T1)* p2 = dynamic_cast<CParam2<T1,NullType>*>(p); t1 = p2->v1; } callback wrapper: #define PARAM1(T1) CParam2<T1,NullType> #define PARAM2(T1,T2) CParam2<T1,T2> #define PARAM3(T1,T2,T3) CParam2<T1,CParam2<T2,T3> > class CallbackFunc { public: virtual ~CallbackFunc(){} virtual void Excute(void){} }; template<class T> class CallbackFunc2 : public CallbackFunc { public: CallbackFunc2():m_b(false){} CallbackFunc2(T &t):m_t(t),m_b(true){} T m_t; bool m_b; }; template<class M,class T> class StaticCallbackFunc : public CallbackFunc2<T> { public: StaticCallbackFunc(M m):m_m(m){} StaticCallbackFunc(M m,T t):CallbackFunc2<T>(t),m_m(m){} virtual void Excute(void){assert(CallbackFunc2<T>::m_b);CallMethod(CallbackFunc2<T>::m_t);} private: template<class T1> void CallMethod(PARAM1(T1) &t){m_m(t.v1);} template<class T1,class T2> void CallMethod(PARAM2(T1,T2) &t){m_m(t.v1,t.v2);} template<class T1,class T2,class T3> void CallMethod(PARAM3(T1,T2,T3) &t){m_m(t.v1,t.v2.v1,t.v2.v2);} private: M m_m; }; template<class M> class StaticCallbackFunc<M,void> : public CallbackFunc { public: StaticCallbackFunc(M method):m_m(method){} virtual void Excute(void){m_m();} private: M m_m; }; template<class C,class M,class T> class MemberCallbackFunc : public CallbackFunc2<T> { public: MemberCallbackFunc(C *pC,M m):m_pC(pC),m_m(m){} MemberCallbackFunc(C *pC,M m,T t):CallbackFunc2<T>(t),m_pC(pC),m_m(m){} virtual void Excute(void){assert(CallbackFunc2<T>::m_b);CallMethod(CallbackFunc2<T>::m_t);} template<class T1> void CallMethod(PARAM1(T1) &t){(m_pC->*m_m)(t.v1);} template<class T1,class T2> void CallMethod(PARAM2(T1,T2) &t){(m_pC->*m_m)(t.v1,t.v2);} template<class T1,class T2,class T3> void CallMethod(PARAM3(T1,T2,T3) &t){(m_pC->*m_m)(t.v1,t.v2.v1,t.v2.v2);} private: C *m_pC; M m_m; }; template<class T1> CallbackFunc *CreateCallback(CallbackFunc *p,T1 t1) { CParam2<T1,NullType> t(t1); return new StaticCallbackFunc<CallbackFunc *,CParam2<T1,NullType> >(p,t); } template<class C,class T1> CallbackFunc *CreateCallback(C *pC,void(C::*pF)(T1),T1 t1) { CParam2<T1,NullType>t(t1); return new MemberCallbackFunc<C,void(C::*)(T1),CParam2<T1,NullType> >(pC,pF,t); } template<class T1> CParam2<T1,NullType> CreateCallbackParam(T1 t1) { return CParam2<T1,NullType>(t1); } template<class T1> void ExcuteCallback(CallbackFunc *p,T1 t1) { CallbackFunc2<CParam2<T1,NullType> > *p2 = dynamic_cast<CallbackFunc2<CParam2<T1,NullType> > *>(p); p2->m_t.v1 = t1; p2->m_b = true; p->Excute(); }

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• How to morph from a programmer noob to a guru?

  - by didxga

  I have been a programmer for two years, and i am getting hard to level up my skill especially working at legacy code maintenance right now. I think working hard is not enough to elevate my skill, because there are ton of opensource around us, the preoject i have been involved are all mixture of opensources --- from front end to back end from presentation tier to business logic tier. My work is just gluing all these together or something fewer complex which is to collect data from UI to logic module then retrieve the data processed and put it to UI. Sometime there is a need to add some simple logic(like assembling the data to a form that fit business logic interface) while transport data. Could you please give me any suggestion what should i do on the side to improve my skill? Thanks!

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• Downloading anything is hell and arduous without an application. Care to help out an Ubunt-noob?

  - by FilthyCasual

  Torrent from the Pirate Bay even though I have Tixati installed and working? Asks for an application which I don't have (apturl or something similar?) Trying to get the latest AMD Radeon drivers automatically installed? the main file downloads...but just shows up in a window full of files but idk where to drag them. And PlayOnLinux my one hope for gaming since Steam is buggin out without proper drivers? Can't figure out where to "mount" the DVD version it asks for. I'm so lost. I dove head first into the Linux thing thinking it was wildly superior, and maybe it is, but dang if the simplest things aren't hard to do. Any help appreciated. I've been reading guides and manuals but what I need is human experience most of all.

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• How to populate a generic list of objects in C# from SQL database

  - by developr

  I am just learning ASP.NET c# and trying to incorporate best practices into my applications. Everything that I read says to layer my applications into DAL, BLL, UI, etc based on separation of concerns. Instead of passing datatables around, I am thinking about using custom objects so that I am loosely coupled to my data layer and can take advantage of intellisense in VS. I assume these objects would be considered DTOs? First, where do these objects reside in my layers? BLL, DAL, other? Second, when populating from SQL, should I loop through a data reader to populate the list or first fill a data table, then loop through the table to populate the list? I know you should close the database connection as soon as possible, but it seems like even more overhead to populate the data table and then loop through that for the list. Third, everything I see these days says use Linq2SQL. I am planning to learn Linq2SQL, but at this time I am working with a legacy database that doesn't have foreign keys setup and I do not have the ability to fix it atm. Also, I want to learn more about c# before I start getting into ORM solutions like nHibernate. At the same time I don't want to type out all the connection and SQL plumbing for every query. Is it ok to use the Enterprise DAAB for now?

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• Automapper -cannot resolve the Generic List

  - by chugh97

  Mapper.CreateMap<BusinessObject, Proxy.DataContacts.DCObject>() .ForMember(x => x.ExtensionData, y => y.Ignore()) .ForMember(z => z.ValidPlaces, a=> a.ResolveUsing(typeof(ValidPlaces))); Mapper.AssertConfigurationIsValid(); public class BusinessObject { public Enum1 Enum1 { get; set; } public List<ValidPlaces> ValidPlaces{ get; set; } } public class ValidPlaces { public int No { get; set; } public string Name { get; set; } } public class DCObject { [DataMember] public Enum1 Enum1 { get; set; } [DataMember] public List<ValidPlaces> ValidPlaces{ get; set; } } Mapper.CreateMap works find when Mapper.AssertConfigurationIsValid(); is called but when I actually call into the service the Automapper throws and excetion saying ValidPlaces could not be mapped.Works fine if I put Ignore() but ideally want that passed.Any AutoMapper experts out there pls help.

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• Building a generic page "Query Analyzer" like in Asp.net with SMO

  - by Rodrigo

  Hello, I'm build a web page in ASP.net is supposed to work just like Query Analyzer. It has basically a textarea to input the sql command, and an Execute button. I'm using SMO to execute the command in the database, as follows: //Create object SMO Microsoft.SqlServer.Management.Smo.Server server = new Microsoft.SqlServer.Management.Smo.Server(new Microsoft.SqlServer.Management.Common.ServerConnection(oConn)); //To execute the command server.ConnectionContext.ExecuteNonQuery(tbx_cmd.Text); //OR myDataset = server.ConnectionContext.ExecuteWithResults(tbx_cmd.Text); The problem is that the textarea command can contain anything, from a stored procedure (with GO's statements) and any select command that return resultsets, just like Query Analyzer. But, if I have GO statements, I only can perform the query using ExecuteNonQuery method. If I use the ExecuteWithResults method, it raises errors because of the GO statements. And if I want the resultsets to be available, of course I can only use the ExecuteWithResults method. Does anybody knows how can I do to execute the same command texts at the same time? Thank you!

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• Using a Generic Repository pattern with fluent nHibernate

  - by alex

  I'm currently developing a medium sized application, which will access 2 or more SQL databases, on different sites etc... I am considering using something similar to this: http://mikehadlow.blogspot.com/2008/03/using-irepository-pattern-with-linq-to.html However, I want to use fluent nHibernate, in place of Linq-to-SQL (and of course nHibernate.Linq) Is this viable? How would I go about configuring this? Where would my mapping definitions go etc...? This application will eventually have many facets - from a WebUI, WCF Library and Windows applications / services. Also, for example on a "product" table, would I create a "ProductManager" class, that has methods like: GetProduct, GetAllProducts etc... Any pointers are greatly received.

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• Generic foreach loop in C#.

  - by mcoolbeth

  The compiler, given the following code, tells me "Use of unassigned local variable 'x'." Any thoughts? public delegate Y Function<X,Y>(X x); public class Map<X,Y> { private Function<X,Y> F; public Map(Function f) { F = f; } public Collection<Y> Over(Collection<X> xs){ List<Y> ys = new List<Y>(); foreach (X x in xs) { X x2 = x;//ys.Add(F(x)); } return ys; } }

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• Avoiding unsafe cast for generic situation involving runtime passing of class

  - by Bart van Heukelom

  public class AutoKeyMap<K,V> { public interface KeyGenerator<K> { public K generate(); } private KeyGenerator<K> generator; public AutoKeyMap(Class<K> keyType) { // WARNING: Unchecked cast from AutoKeyMap.IntKeyGen to AutoKeyMap.KeyGenerator<K> if (keyType == Integer.class) generator = (KeyGenerator<K>) new IntKeyGen(); else throw new RuntimeException("Cannot generate keys for " + keyType); } public void put(V value) { K key = generator.generate(); ... } private static class IntKeyGen implements KeyGenerator<Integer> { private final AtomicInteger ai = new AtomicInteger(1); @Override public Integer generate() { return ai.getAndIncrement(); } } } In the code sample above, what is the correct way to prevent the given warning, without adding a @SuppressWarnings, if any?

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• Invoking EventHandler generic, TargetParameterCountException

  - by Am

  Hi, I have a DirectoryMonitor class which works on another thread. It has the following events declared: public class DirectoryMonitor { public event EventHandler<MonitorEventArgs> CreatedNewBook; public event EventHandler ScanStarted; .... } public class MonitorEventArgs : EventArgs { public Book Book { get; set; } } There is a form using that monitor, and upon receiving the events, it should update the display. Now, this works: void DirectoryMonitor_ScanStarted(object sender, EventArgs e) { if (InvokeRequired) { Invoke(new EventHandler(this.DirectoryMonitor_ScanStarted)); } else {...} } But this throws TargetParameterCountException: void DirectoryMonitor_CreatedNewBook(object sender, MonitorEventArgs e) { if (InvokeRequired) { Invoke(new EventHandler<MonitorEventArgs>(this.DirectoryMonitor_CreatedNewBook)); } else {...} } What am I missing?

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• Generic styles for DataGridTemplateColumn Headers & Cells

  - by user557765

  I am struggling to define templates for my DataGrid columns. Here is the code that I have working at the moment: <t:DataGrid.Columns> <t:DataGridTemplateColumn Width="75" > <t:DataGridTemplateColumn.HeaderTemplate> <DataTemplate> <TextBlock Style="{StaticResource FieldNameVertical}" Text="Date" /> </DataTemplate> </t:DataGridTemplateColumn.HeaderTemplate> <t:DataGridTemplateColumn.CellTemplate> <DataTemplate> <TextBlock Style="{StaticResource FieldValue}" Text="{Binding ModifiedDate, StringFormat='{}{0:MM/dd/yyyy}'}" /> </DataTemplate> </t:DataGridTemplateColumn.CellTemplate> </t:DataGridTemplateColumn> .. .. .. </t:DataGrid.Columns> I would like to define HeaderTemplate & CellTemplate as reusable styles -- so that each column would be as brief as something like this: <t:DataGrid.Resources> <DataTemplate x:Key="dgHeaderStyle"> <TextBlock Style="{StaticResource FieldNameVertical}" Text="{Binding}" /> </DataTemplate> <DataTemplate x:Key="dgCellStyle"> <TextBlock Style="{StaticResource FieldValue}" Text="{Binding}" /> </DataTemplate> </t:DataGrid.Resources> <t:DataGrid.Columns> <t:DataGridTemplateColumn Width="75" Header="Date" Binding="{Binding ModifiedDate, StringFormat='{}{0:MM/dd/yyyy}'}" HeaderTemplate="{StaticResource dgHeaderStyle}" CellTemplate="{StaticResource dgCellStyle}" /> <t:DataGridTemplateColumn Width="100" Header="Dealer" HeaderTemplate="{StaticResource dgHeaderStyle}" CellTemplate="{StaticResource dgCellStyle}" /> ... </t:DataGrid.Columns> Every attempt I make has failed. I had hoped to implement something like the "solution" snippet in the initial entry of WPF DataGrid HeaderTemplate Mysterious Padding. However, I can't seem to adapt it to what I'm doing.

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• Castle Windsor upgrade causes TypeLoadException for generic types

  - by Neil Barnwell

  I have the following mapping in my Castle Windsor xml file which has worked okay (unchanged) for some time: <component id="defaultBasicRepository" service="MyApp.Models.Repositories.IBasicRepository`1, MyApp.Models" type="MyApp.Models.Repositories.Linq.BasicRepository`1, MyApp.Models" lifestyle="perWebRequest"/> I got this from the Windsor documentation at http://www.castleproject.org/container/documentation/v1rc3/usersguide/genericssupport.html. Since I upgraded Windsor, I now get the following exception at runtime: Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.TypeLoadException: GenericArguments[0], 'T', on 'MyApp.Models.Repositories.Linq.BasicRepository`1[TEntity]' violates the constraint of type parameter 'TEntity'. Source Error: Line 44: public static void ConfigureIoC() Line 45: { Line 46: var windsor = new WindsorContainer("Windsor.xml"); Line 47: Line 48: ServiceLocator.SetLocatorProvider(() = new WindsorServiceLocator(windsor)); I'm using ASP.NET MVC 1.0, Visual Studio 2008 and Castle Windsor as downloaded from http://sourceforge.net/projects/castleproject/files/InversionOfControl/2.1/Castle-Windsor-2.1.1.zip/download Can anyone shed any light on this? I'm sure the upgrade of Castle Windsor is what caused it - it's been working well for ages.

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• Java Builder pattern with Generic type bounds

  - by I82Much

  Hi all, I'm attempting to create a class with many parameters, using a Builder pattern rather than telescoping constructors. I'm doing this in the way described by Joshua Bloch's Effective Java, having private constructor on the enclosing class, and a public static Builder class. The Builder class ensures the object is in a consistent state before calling build(), at which point it delegates the construction of the enclosing object to the private constructor. Thus public class Foo { // Many variables private Foo(Builder b) { // Use all of b's variables to initialize self } public static final class Builder { public Builder(/* required variables */) { } public Builder var1(Var var) { // set it return this; } public Foo build() { return new Foo(this); } } } I then want to add type bounds to some of the variables, and thus need to parametrize the class definition. I want the bounds of the Foo class to be the same as that of the Builder class. public class Foo<Q extends Quantity> { private final Unit<Q> units; // Many variables private Foo(Builder<Q> b) { // Use all of b's variables to initialize self } public static final class Builder<Q extends Quantity> { private Unit<Q> units; public Builder(/* required variables */) { } public Builder units(Unit<Q> units) { this.units = units; return this; } public Foo build() { return new Foo<Q>(this); } } } This compiles fine, but the compiler is allowing me to do things I feel should be compiler errors. E.g. public static final Foo.Builder<Acceleration> x_Body_AccelField = new Foo.Builder<Acceleration>() .units(SI.METER) .build(); Here the units argument is not Unit<Acceleration> but Unit<Length>, but it is still accepted by the compiler. What am I doing wrong here? I want to ensure at compile time that the unit types match up correctly.

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• Create a Generic IEnumerable<T> given a IEnumerable and the member datatypes

  - by ilias

  Hi, I get an IEnumerable which I know is a object array. I also know the datatype of the elements. Now I need to cast this to an IEnumerable<T, where T is a supplied type. For instance IEnumerable results = GetUsers(); IEnumerable<T> users = ConvertToTypedIEnumerable(results, typeof(User)); I now want to cast/ convert this to IEnumerable<User. Also, I want to be able to do this for any type. I cannot use IEnumerable.Cast<, because for that I have to know the type to cast it to at compile time, which I don't have. I get the type and the IEnumerable at runtime. - Thanks

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• Session Not working in Generic Handler .ashx in Firefox

  - by slowlycooked

  I have created .ashx which implemented IRequiresSessionState, so I can create session variables in that ashx, it worked in IE, but doesn't work in Firefox. When access this session variable from other pages it's NULL. any idea? thx.

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• Java generics parameters with base of the generic parameter

  - by Iulian Serbanoiu

  Hello, I am wondering if there's an elegant solution for doing this in Java (besides the obvious one - of declaring a different/explicit function. Here is the code: private static HashMap<String, Integer> nameStringIndexMap = new HashMap<String, Integer>(); private static HashMap<Buffer, Integer> nameBufferIndexMap = new HashMap<Buffer, Integer>(); // and a function private static String newName(Object object, HashMap<Object, Integer> nameIndexMap){ .... } The problem is that I cannot pass nameStringIndexMap or nameBufferIndexMap parameters to the function. I don't have an idea about a more elegant solution beside doing another function which explicitly wants a HashMap<String, Integer> or HashMap<Buffer, Integer> parameter. My question is: Can this be made in a more elegant solution/using generics or something similar? Thank you, Iulian

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• Generic HTTP Handler in ASP.Net

  - by Bruno Brant

  Hello all, I want to write a custom HTTP Handler in ASP.Net (I'm using C# currently) that filters all requests to, say, .aspx files, and then, depending on the page name that comes with the requests, I redirect the user to a page. So far, I've written a handler that filter "*", that is, everything. Let's say I receive a request for "Page.aspx", and want to send the user to "AnotherPage.aspx". So I call Redirect on that response and pass "AnotherPage.aspx" as the new page. The problem is that this will once more trigger my handler, which will do nothing. This will leave the user without any response. So, is there a way to send the request to the other handlers (cascade the message) once I've dealt with it? Thanks, Bruno

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• Is it possible to create a generic Util Function to be used in Eval Page

  - by Nassign

  I am currently binding a Nullable bit column to a listview control. When you declare a list view item I need to handle the case when the null value is used instead of just true or false. <asp:Checkbox ID="Chk1" runat="server" Checked='<%# HandleNullableBool(Eval("IsUsed")) %>' /> Then in the page I add a HandleNullableBool() function inside the ASPX page. protected static bool HandleNullableBool(object value) { return (value == null) ? false : (bool)value; } This works fine but I need to use this in several pages so I tried creating a utility class with a static HandleNullableBool. But using it in the asp page does not work. Is there a way to do this in another class instead of the ASPX page? <asp:Checkbox ID="Chk1" runat="server" Checked='<%# Util.HandleNullableBool(Eval("IsUsed")) %>' />

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• Modeling a Generic Relationship in a Database

  - by StevenH

  This is most likely one for all you sexy DBAs out there: How would I effieciently model a relational database whereby I have a field in an "Event" table which defines a "SportType". This "SportsType" field can hold a link to different sports tables E.g. "FootballEvent", "RubgyEvent", "CricketEvent" and "F1 Event". Each of these Sports tables have different fields specific to that sport. My goal is to be able to genericly add sports types in the future as required, yet hold sport specific event data (fields) as part of my Event Entity. Is it possible to use an ORM such as NHibernate / Entity framework which would reflect such a relationship? I have thrown together a quick C# example to express my intent at a higher level: public class Event<T> where T : new() { public T Fields { get; set; } public Event() { EventType = new T(); } } public class FootballEvent { public Team CompetitorA { get; set; } public Team CompetitorB { get; set; } } public class TennisEvent { public Player CompetitorA { get; set; } public Player CompetitorB { get; set; } } public class F1RacingEvent { public List<Player> Drivers { get; set; } public List<Team> Teams { get; set; } } public class Team { public IEnumerable<Player> Squad { get; set; } } public class Player { public string Name { get; set; } public DateTime DOB { get; set;} }

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• How to create a Generic StateManagedCollection?

  - by Larsenal

  One example is described here. But the author apparently forgot to include the code for download. Another example is shown here. However, this one doesn't quite work (as described in comments). How do you do this correctly?

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• Self closing Html Generic Control?

  - by Chalkey

  I am writing a bit of code to add a link tag to the head tag in the code behind... i.e. HtmlGenericControl css = new HtmlGenericControl("link"); css.Attributes["rel"] = "Stylesheet"; css.Attributes["type"] = "text/css"; css.Attributes["href"] = String.Format("/Assets/CSS/{0}", cssFile); to try and achieve something like... <link rel="Stylesheet" type="text/css" href="/CSS/Blah.css" /> I am using the HtmlGenericControl to achieve this... the issue I am having is that the control ultimatly gets rendered as... <link rel="Stylesheet" type="text/css" href="/CSS/Blah.css"></link> I cant seem to find what I am missing to not render the additional </link>, I assumed it should be a property on the object. Am I missing something or is this just not possible with this control? Thanks

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