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• Utility method - Pass a File or String?

  - by James P.

  Here's an example of a utility method: public static Long getFileSize(String fileString) { File file = new File(fileString); if (file == null || !file.isFile()) return null; return file.length(); } Is it a good practise to pass a String rather than a File to a method like this? In general what reasoning should be applied when making utility methods of this style?

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• CQRS - The query side

  - by mattcodes

  A lot of the blogsphere articles related to CQRS (command query repsonsibility) seperation seem to imply that all screens/viewmodels are flat. e.g. Name, Age, Location Of Birth etc.. and thus the suggestion that implementation wise we stick them into fast read source etc.. single table per view mySQL etc.. and pull them out with something like primitive SqlDataReader, kick that nasty nhibernate ORM etc.. However, whilst I agree that domain models dont mapped well to most screens, many of the screens that I work with are more dimensional, and Im sure this is pretty common in LOB apps. So my question is how are people handling screen where by for example it displays a summary of customer details and then a list of their orders with a [more detail] link etc.... I thought about keeping with the straight forward SQL query to the Query Database breaking off the outer join so can build a suitable ViewModel to View but it seems like overkill? Alternatively (this is starting to feel yuck) in CustomerSummaryView table have a text/big (whatever the type is in your DB) column called Orders, and the columns for the Order summary screen grid are seperated by , and rows by |. Even with XML datatype it still feeel dirty. Any thoughts on an optimal practice?

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• Why shouldn't I always use nullable types in C#.

  - by Matthew Vines

  I've been searching for some good guidance on this since the concept was introduced in .net 2.0. Why would I ever want to use non-nullable data types in c#? (A better question is why wouldn't I choose nullable types by default, and only use non-nullable types when that explicitly makes sense.) Is there a 'significant' performance hit to choosing a nullable data type over its non-nullable peer? I much prefer to check my values against null instead of Guid.empty, string.empty, DateTime.MinValue,<= 0, etc, and to work with nullable types in general. And the only reason I don't choose nullable types more often is the itchy feeling in the back of my head that makes me feel like it's more than backwards compatibility that forces that extra '?' character to explicitly allow a null value. Is there anybody out there that always (most always) chooses nullable types rather than non-nullable types? Thanks for your time,

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• Nice name for `decorator' class?

  - by Lajos Nagy

  I would like to separate the API I'm working on into two sections: 'bare-bones' and 'cushy'. The idea is that all method calls in the 'cushy' section could be expressed in terms of the ones in the 'bare-bones' section, that is, they would only serve as convenience methods for the quick-and-dirty. The reason I would like to do this is that very often when people are beginning to use an API for the first time, they are not interested in details and performance: they just want to get it working. Anybody tried anything similar before? I'm particularly interested in naming conventions and organizing the code.

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• C# Design Questions

  - by guazz

  How to approach unit testing of private methods? I have a class that loads Employee data into a database. Here is a sample: public class EmployeeFacade { public Employees EmployeeRepository = new Employees(); public TaxDatas TaxRepository = new TaxDatas(); public Accounts AccountRepository = new Accounts(); //and so on for about 20 more repositories etc. public bool LoadAllEmployeeData(Employee employee) { if (employee == null) throw new Exception("..."); EmployeeRepository emps = new EmployeeRepository(); bool exists = emps.FetchExisting(emps.Id); if (!exists) { emps.AddNew(); } try { emps.Id = employee.Id; emps.Name = employee.EmployeeDetails.PersonalDetails.Active.Names.FirstName; emps.SomeOtherAttribute; } catch() {} try { emps.Save(); } catch(){} try { LoadorUpdateTaxData(employee.TaxData); } catch() {} try { LoadorUpdateAccountData(employee.AccountData); } catch() {} ... etc. for about 20 more other employee objects } private bool LoadorUpdateTaxData(employeeId, TaxData taxData) { if (taxData == null) throw new Exception("..."); ...same format as above but using AccountRepository } private bool LoadorUpdateAccountData(employee.TaxData) { ...same format as above but using TaxRepository } } I am writing an application to take serialised objects(e.g. Employee above) and load the data to the database. I have a few design question that I would like opinions on: A - I am calling this class "EmployeeFacade" because I am (attempting?) to use the facade pattern. Is it good practace to name the pattern on the class name? B - Is it good to call the concrete entities of my DAL layer classes "Repositories" e.g. "EmployeeRepository" ? C - Is using the repositories in this way sensible or should I create a method on the repository itself to take, say, the Employee and then load the data from there e.g. EmployeeRepository.LoadAllEmployeeData(Employee employee)? I am aim for cohesive class and but this will requrie the repository to have knowledge of the Employee object which may not be good? D - Is there any nice way around of not having to check if an object is null at the begining of each method? E - I have a EmployeeRepository, TaxRepository, AccountRepository declared as public for unit testing purpose. These are really private enities but I need to be able to substitute these with stubs so that the won't write to my database(I overload the save() method to do nothing). Is there anyway around this or do I have to expose them? F - How can I test the private methods - or is this done (something tells me it's not)? G- "emps.Name = employee.EmployeeDetails.PersonalDetails.Active.Names.FirstName;" this breaks the Law of Demeter but how do I adjust my objects to abide by the law?

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• AS3 Classes - Should I use them?

  - by Eric

  I'm working on a project in Flash CS4/AS3 and I have a document class set up but I am wondering about using that, as opposed to frame-based scripting. Most of what I have seen so far deals with how to create them, but doesn't offer much about why or when to use them. I know I can also pull in other classes beyond the document class but, again, why and when? Could I get some input from you fine people out there on usage/best practice, etc? Thanks

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• What are the best programming articles?

  - by lillq

  Part of being a good software developer is keeping current with what people are saying in the community. There are many good articles out there on the Internet about the wide subject of computer programming. What articles have you found worth your time? Please provide the article's title, author and a link if possible.

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• Query Object Pattern (Design Pattern)

  - by The Elite Gentleman

  Hi Guys, I need to implement a Query Object Pattern in Java for my customizable search interface (of a webapp I'm writing). Does anybody know where I can get an example/tutorial of Query Object Pattern (Martin Fowler's QoP)? Thanks in Advance ADDITION How to add a Query Pattern to an existing DAO pattern?

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• how to do gedcom import with minimal database roundtrip. what is best practice for this kind of dev

  - by Radhi

  In My current application, I need to import users from gedcom file. these users may exist in my registered users or i need to create one registered user for the same. now gedcom file contain s many information e.g. PersonalDetails,Addresses, Education Details, ProfessionalDetails this is one sample of xml file we are storing to store user's profile. <UserProfile xmlns=""> <BasicInfo> <Title value="Basic Details" /> <Fields> <UserId title="UserId" right="Public" value="151" /> <EmailAddress title="Email Address" right="CUG" value="[email protected]" /> <FirstName title="First Name" right="Public" value="Anju" /> <LastName title="Last Name" right="Public" value="Trivedi" /> <DisplayName title="Display Name" right="Private" value="Anju" /> <RegistrationStatusId title="RegistrationStatusId" right="Public" value="10" /> <RegistrationStatus title="Registration Status" right="Private" value="Registered" /> <CityId title="CityId" right="Private" value="19" /> <CityName title="City" right="Public" value="Delhi" /> <StateId title="StateId" right="Private" value="69" /> <StateName title="State" right="Public" value="Delhi" /> <CountryId title="CountryId" right="Private" value="109" /> <CountryName title="Country" right="Public" value="India" /> <Gender title="Gender" right="Private" value="Male" /> <CreatedBy title="CreatedBy" right="Public" value="0" /> <CreatedOn title="CreatedOn" right="Public" value="Nov 27 2009 3:08PM " /> <ModifiedBy title="ModifiedBy" right="Public" value="13" /> <ModifiedOn title="ModifiedOn" right="Public" value="Mar 3 2010 6:56PM " /> <LogInStatusId title="LogInStatusId" right="Public" value="1" /> <LogInStatus title="LogIn Status" right="Private" value="Free" /> <ProfileImagePath title="Profile Pic" right="Public" value="~/Images/13_HolidayBarbie07CL2010427143129.jpg" /> <ProfileThumbnailPath title="Profile Thumbnail" right="Public" value="~/Images/Thumb13_HolidayBarbie07CL2010427143129.jpg" /> </Fields> </BasicInfo> <PersonalInfo> <Title value="Personal Details" /> <Fields> <Nickname title="Nick Name" right="Public" value="Anju" /> <NativeLocation title="Native" right="Public" value="Mehsana" /> <DateofAnniversary title="Anniversary Dt." right="Private" value="4/1/2010" /> <BloodGroupId title="BloodGroupId" right="Public" value="24" /> <BloodGroupName title="Blood Group" right="Public" value="A+" /> <MaritalStatusId title="MaritalStatusId" right="Private" value="35" /> <MaritalStatusName title="Marital status" right="Private" value="UnMarried" /> <DateofDeath title="Death dt" right="Private" value="" /> <CreatedBy title="CreatedBy" right="Public" value="" /> <CreatedOn title="CreatedOn" right="Public" value="" /> <ModifiedBy title="ModifiedBy" right="Public" value="13" /> <ModifiedOn title="ModifiedOn" right="Public" value="4/27/2010 2:32:07 PM" /> <DateOfBirth title="Birth Date" value="" right="CUG" /> <BirthPlace title="Birth Place" value="Jaipur" right="Private" /> </Fields> </PersonalInfo> <FamilyInfo> <Title value="Family Details" /> <Fields> <GallantryHistory title="Gallantry History" right="Public" value="Anjli History" /> <Ethinicity title="Ethinicity" right="Public" value="Indian" /> <KulDev title="KulDev" right="Public" value="Krishna" /> <KulDevi title="KulDevi" right="Public" value="Lakhsmi" /> <Caste title="Caste" right="Private" value="Vaishnav" /> <SunSignId title="SunSignId" right="Public" value="15" /> <SunSignName title="SunSignName" right="Public" value="Gemini" /> <CreatedBy title="CreatedBy" right="Public" value="13" /> <CreatedOn title="CreatedOn" right="Public" value="Dec 11 2009 12:00AM " /> <ModifiedBy title="ModifiedBy" right="Public" value="13" /> <ModifiedOn title="ModifiedOn" right="Public" value="Dec 11 2009 12:00AM " /> </Fields> </FamilyInfo> <HobbyInfo> <Title value="Hobbies/Interests" /> <Fields> <AbountMe title="Abount Me" right="Public" value="" /> <Hobbies title="Hobbies" right="Public" value="" /> <Food title="Food" right="Public" value="" /> <Movies title="Movies" right="Public" value="" /> <Music title="Music" right="Public" value="" /> <TVShows title="TV Shows" right="Public" value="" /> <Books title="Books" right="Public" value="" /> <Sports title="Sports" right="Public" value="" /> <Will title="Will" right="Public" value="" /> <FavouriteQuotes title="Favourite Quotes" right="Public" value="" /> <CremationPrefernces title="Cremation Prefernces" right="Public" value="" /> <CreatedBy title="CreatedBy" right="Public" value="" /> <CreatedOn title="CreatedOn" right="Public" value="" /> <ModifiedBy title="ModifiedBy" right="Public" value="" /> <ModifiedOn title="ModifiedOn" right="Public" value="" /> </Fields> </HobbyInfo> <PermenantAddr> <Title value="Permenant Address" /> <Fields> <Address title="Address" right="Public" value="Select" /> <CityId title="CityId" right="Public" value="116" /> <CityName title="City" right="Public" value="Iran" /> <StateId title="StateId" right="Public" value="95" /> <StateName title="State" right="Public" value="Iran" /> <CountryId title="CountryId" right="Public" value="7" /> <CountryName title="Country" right="Public" value="Afghanistan" /> <ZipCode title="ZipCode" right="Private" value="" /> <CreatedBy title="CreatedBy" right="Public" value="" /> <CreatedOn title="CreatedOn" right="Public" value="" /> <ModifiedBy title="ModifiedBy" right="Public" value="13" /> <ModifiedOn title="ModifiedOn" right="Public" value="4/6/2010 10:48:39 AM" /> </Fields> </PermenantAddr> <PresentAddr> <Title value="Present Address" /> <Fields> <Address title="Address" right="Public" value="Select" /> <CityId title="CityId" right="Public" value="1" /> <CityName title="City" right="Public" value="Select" /> <StateId title="StateId" right="Public" value="1" /> <StateName title="State" right="Public" value="Select" /> <CountryId title="CountryId" right="Public" value="1" /> <CountryName title="Country" right="Public" value="Select" /> <ZipCode title="ZipCode" right="Private" value="" /> <CreatedBy title="CreatedBy" right="Public" value="" /> <CreatedOn title="CreatedOn" right="Public" value="" /> <ModifiedBy title="ModifiedBy" right="Public" value="" /> <ModifiedOn title="ModifiedOn" right="Public" value="" /> </Fields> </PresentAddr> <ContactInfo> <Title value="Contact Details" /> <Fields> <DayPhoneNo title="Day Phone" right="Public" value="" /> <NightPhoneNo title="Night Phone" right="Public" value="" /> <MobileNo title="Mobile No" right="Private" value="" /> <FaxNo title="Fax No" right="CUG" value="" /> <CreatedBy title="CreatedBy" right="Public" value="" /> <CreatedOn title="CreatedOn" right="Public" value="" /> <ModifiedBy title="ModifiedBy" right="Public" value="" /> <ModifiedOn title="ModifiedOn" right="Public" value="" /> </Fields> </ContactInfo> <EmailInfo> <Title value="Alternate Email Addresses" /> <Fields> <Record right="Public"> <Id title="Id" right="Public" value="3" /> <Provider title="Provider" right="Public" value="google" /> <EmailAddress title="Email Address" right="Public" value="[email protected]" /> <IsActive title="IsActive" right="Public" value="false" /> <CreatedBy title="CreatedBy" right="Public" value="13" /> <CreatedOn title="CreatedOn" right="Public" value="Mar 3 2010 10:17AM " /> <ModifiedBy title="ModifiedBy" right="Public" value="0" /> <ModifiedOn title="ModifiedOn" right="Public" value=" " /> </Record> <Record right="Public"> <Id title="Id" right="Public" value="4" /> <Provider title="Provider" right="Public" value="Yahoo" /> <EmailAddress title="Email Address" right="Public" value="[email protected]" /> <IsActive title="IsActive" right="Public" value="false" /> <CreatedBy title="CreatedBy" right="Public" value="13" /> <CreatedOn title="CreatedOn" right="Public" value="Mar 3 2010 6:53PM " /> <ModifiedBy title="ModifiedBy" right="Public" value="0" /> <ModifiedOn title="ModifiedOn" right="Public" value=" " /> </Record> <Record right="Private"> <Provider value="111" right="Private" /> <EmailAddress value="[email protected]" right="Private" /> <Id value="5" /> <IsActive value="true" right="Private" /> <ModifiedBy value="13" right="Private" /> <ModifiedOn value="Tuesday, March 16, 2010" right="Private" /> </Record> </Fields> </EmailInfo> <AcademicInfo> <Title value="Education Details" /> <Fields> <Record right="Public"> <Id title="Id" right="Public" value="0" /> <Education title="Education" right="Public" value="" /> <Institute title="Institute" right="Public" value="" /> <PassingYear title="Passing Year" right="Public" value="" /> <IsActive title="IsActive" right="Public" value="" /> <CreatedBy title="CreatedBy" right="Public" value="" /> <CreatedOn title="CreatedOn" right="Public" value="" /> <ModifiedBy title="ModifiedBy" right="Public" value="" /> <ModifiedOn title="ModifiedOn" right="Public" value="" /> </Record> </Fields> </AcademicInfo> <AchievementInfo> <Title value="Achievement Details" /> <Fields> <Record right="Public"> <Id title="Id" right="Public" value="0" /> <Awards title="Award" right="Public" value="" /> <FieldOfAward title="Field Of Award" right="Public" value="" /> <Tournament title="Tournament" right="Public" value="" /> <AwardDescription title="Description" right="Public" value="" /> <AwardYear title="Award Year" right="Public" value="" /> <IsActive title="IsActive" right="Public" value="" /> <CreatedBy title="CreatedBy" right="Public" value="" /> <CreatedOn title="CreatedOn" right="Public" value="" /> <ModifiedBy title="ModifiedBy" right="Public" value="" /> <ModifiedOn title="ModifiedOn" right="Public" value="" /> </Record> </Fields> </AchievementInfo> <ProfessionalInfo> <Title value="Professional Details" /> <Fields> <Record right="Public"> <Id title="Id" right="Public" value="4" /> <Occupation title="Occupation" right="Public" value="a" /> <Organization title="Organization" right="Public" value="a" /> <ProjectsDescription title="Description" right="Public" value="a" /> <Duration title="Duration" right="Public" value="2" /> <IsActive title="IsActive" right="Public" value="false" /> <CreatedBy title="CreatedBy" right="Public" value="13" /> <CreatedOn title="CreatedOn" right="Public" value="Jan 7 2010 1:14PM " /> <ModifiedBy title="ModifiedBy" right="Public" value="13" /> <ModifiedOn title="ModifiedOn" right="Public" value="Jan 7 2010 1:14PM " /> </Record> <Record right="Public"> <Id title="Id" right="Public" value="5" /> <Occupation title="Occupation" right="Public" value="ab" /> <Organization title="Organization" right="Public" value="zsd" /> <ProjectsDescription title="Description" right="Public" value="sd" /> <Duration title="Duration" right="Public" value="5" /> <IsActive title="IsActive" right="Public" value="false" /> <CreatedBy title="CreatedBy" right="Public" value="13" /> <CreatedOn title="CreatedOn" right="Public" value="Jan 7 2010 1:15PM " /> <ModifiedBy title="ModifiedBy" right="Public" value="13" /> <ModifiedOn title="ModifiedOn" right="Public" value="Jan 7 2010 1:15PM " /> </Record> <Record right="Public"> <Id title="Id" right="Public" value="8" /> <Occupation title="Occupation" right="Public" value="fgdf" /> <Organization title="Organization" right="Public" value="gdfg" /> <ProjectsDescription title="Description" right="Public" value="dfgdf" /> <Duration title="Duration" right="Public" value="12" /> <IsActive title="IsActive" right="Public" value="false" /> <CreatedBy title="CreatedBy" right="Public" value="13" /> <CreatedOn title="CreatedOn" right="Public" value="Feb 22 2010 5:07PM " /> <ModifiedBy title="ModifiedBy" right="Public" value="0" /> <ModifiedOn title="ModifiedOn" right="Public" value="Jan 1 1900 12:00AM " /> </Record> <Record right="Public"> <Id title="Id" right="Public" value="9" /> <Occupation title="Occupation" right="Public" value="fgdf" /> <Organization title="Organization" right="Public" value="gdfg" /> <ProjectsDescription title="Description" right="Public" value="dfgdf" /> <Duration title="Duration" right="Public" value="12" /> <IsActive title="IsActive" right="Public" value="false" /> <CreatedBy title="CreatedBy" right="Public" value="13" /> <CreatedOn title="CreatedOn" right="Public" value="Feb 22 2010 5:11PM " /> <ModifiedBy title="ModifiedBy" right="Public" value="0" /> <ModifiedOn title="ModifiedOn" right="Public" value="Jan 1 1900 12:00AM " /> </Record> <Record right="Public"> <Id title="Id" right="Public" value="10" /> <Occupation title="Occupation" right="Public" value="fgdf" /> <Organization title="Organization" right="Public" value="gdfg" /> <ProjectsDescription title="Description" right="Public" value="dfgdf" /> <Duration title="Duration" right="Public" value="12" /> <IsActive title="IsActive" right="Public" value="false" /> <CreatedBy title="CreatedBy" right="Public" value="13" /> <CreatedOn title="CreatedOn" right="Public" value="Feb 22 2010 5:13PM " /> <ModifiedBy title="ModifiedBy" right="Public" value="0" /> <ModifiedOn title="ModifiedOn" right="Public" value="Jan 1 1900 12:00AM " /> </Record> </Fields> </ProfessionalInfo> <SecuritySettings> <AlbumRights> <Create value="Private" /> <View value="CUG" /> <Edit value="CUG" /> <Delete value="CUG" /> <PostComments value="CUG" /> <AddToAlbum value="CUG" /> </AlbumRights> <ImageRights> <Create value="Private" /> <View value="CUG" /> <Edit value="CUG" /> <Delete value="CUG" /> <PostComments value="Private" /> </ImageRights> </SecuritySettings> </UserProfile> now when i am importing data from gedcom, i am creating one person object which contains all this info. but before i insert it itodatabase have to check if userid exist for the emailaddress dont update data else create a user and update its profilexml from data fecthed from gedcom. for this i think i need some soln by which i can do only one roundtrip to database and can update all user's xml. or i can execute one sp to get userid from all users where i'll check if user exist then return userid else insert basic data and return inserted userid then for every user make xml from data and update it. please provide be suggestion what is best practice to do this kind of development. if need any more details please write me

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• Scope of Connection Object for a Website using Connection Pooling (Local or Instance)

  - by Danny

  For a web application with connection polling enabled, is it better to work with a locally scoped connection object or instance scoped connection object. I know there is probably not a big performance improvement between the two (because of the pooling) but would you say that one follows a better pattern than the other. Thanks ;) public class MyServlet extends HttpServlet { DataSource ds; public void init() throws ServletException { ds = (DataSource) getServletContext().getAttribute("DBCPool"); } protected void doGet(HttpServletRequest arg0, HttpServletResponse arg1) throws ServletException, IOException { SomeWork("SELECT * FROM A"); SomeWork("SELECT * FROM B"); } void SomeWork(String sql) { Connection conn = null; try { conn = ds.getConnection(); // execute some sql ..... } finally { if(conn != null) { conn.close(); // return to pool } } } } Or public class MyServlet extends HttpServlet { DataSource ds; Connection conn;* public void init() throws ServletException { ds = (DataSource) getServletContext().getAttribute("DBCPool"); } protected void doGet(HttpServletRequest arg0, HttpServletResponse arg1) throws ServletException, IOException { try { conn = ds.getConnection(); SomeWork("SELECT * FROM A"); SomeWork("SELECT * FROM B"); } finally { if(conn != null) { conn.close(); // return to pool } } } void SomeWork(String sql) { // execute some sql ..... } }

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• Abstract Factory design pattern to create objects? Why can’t we just use the new operator?

  - by Harsha

  why do we need a Abstract Factory design pattern to create objects? Why can’t we just use the new operator? answer is, to avoid tight coupleing of the objects. But I didn't understand how ? can anyone explain with code (will be very useful). what makes abstract factory design pattern useful and when. Thanks in advance. Harsha T

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• Domain driven design: Manager and service

  - by ryudice

  I'm creating some business logic in the application but I'm not sure how or where to encapsulate it, I've used the repository pattern for data access, I've seen some projects that use DDD that have some classes with the "Service" suffix and the "manager" suffix, what are each of this clases suppose to take care of in DDD?

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• Proper way to dispose of Quartz.NET?

  - by Seth Spearman

  I am using Quartz.NET in an application. What is the proper way to dispose of Quartz.NET. Right now I am just doing if (_quartzScheduler != null) { _quartzScheduler = null; } Is that enough or should I implement a dispose or something in the jobType class? Seth

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• Strategy pattern and "action" classes explosion

  - by devoured elysium

  Is it bad policy to have lots of "work" classes(such as Strategy classes), that only do one thing? Let's assume I want to make a Monster class. Instead of just defining everything I want about the monster in one class, I will try to identify what are its main features, so I can define them in interfaces. That will allow to: Seal the class if I want. Later, other users can just create a new class and still have polymorphism by means of the interfaces I've defined. I don't have to worry how people (or myself) might want to change/add features to the base class in the future. All classes inherit from Object and they implement inheritance through interfaces, not from mother classes. Reuse the strategies I'm using with this monster for other members of my game world. Con: This model is rigid. Sometimes we would like to define something that is not easily achieved by just trying to put together this "building blocks". public class AlienMonster : IWalk, IRun, ISwim, IGrowl { IWalkStrategy _walkStrategy; IRunStrategy _runStrategy; ISwimStrategy _swimStrategy; IGrowlStrategy _growlStrategy; public Monster() { _walkStrategy = new FourFootWalkStrategy(); ...etc } public void Walk() { _walkStrategy.Walk(); } ...etc } My idea would be next to make a series of different Strategies that could be used by different monsters. On the other side, some of them could also be used for totally different purposes (i.e., I could have a tank that also "swims"). The only problem I see with this approach is that it could lead to a explosion of pure "method" classes, i.e., Strategy classes that have as only purpose make this or that other action. In the other hand, this kind of "modularity" would allow for high reuse of stratagies, sometimes even in totally different contexts. What is your opinion on this matter? Is this a valid reasoning? Is this over-engineering? Also, assuming we'd make the proper adjustments to the example I gave above, would it be better to define IWalk as: interface IWalk { void Walk(); } or interface IWalk { IWalkStrategy WalkStrategy { get; set; } //or something that ressembles this } being that doing this I wouldn't need to define the methods on Monster itself, I'd just have public getters for IWalkStrategy (this seems to go against the idea that you should encapsulate everything as much as you can!) Why? Thanks

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• XMl Data Structure

  - by metdos

  Which one of two XML structures below do you prefer? Why? Any other suggestion is welcome :) <Parameters> <Parameter id=username>metdos</Parameter> <Parameter id=password>123</Parameter> </Parameters> or <Parameters> <username>metdos</username> <password>123</password> </Parameters>

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• Preloading Winforms using a Stack and Hidden Form

  - by msarchet

  I am currently working on a project where we have a couple very control heavy user controls that are being used inside a MDI Controller. This is a Line of Business app and it is very data driven. The problem that we were facing was the aforementioned controls would load very very slowly, we dipped our toes into the waters of multi-threading for the control loading but that was not a solution for a plethora of reasons. Our solution to increasing the performance of the controls ended up being to 'pre-load' the forms onto a hidden window, create a stack of the existing forms, and pop off of the stack as the user requested a form. Now the current issue that I'm seeing that will arise as we push this 'fix' out to our testers, and the ultimately our users is this: Currently the 'hidden' window that contains the preloaded forms is visible in task manager, and can be shut down thus causing all of the controls to be lost. Then you have to create them on the fly losing the performance increase. Secondly, when the user uses up the stack we lose the performance increase (current solution to this is discussed below). For the first problem, is there a way to hide this window from task manager, perhaps by creating a parent form that encapsulates both the main form for the program and the hidden form? Our current solution to the second problem is to have an inactivity timer that when it fires checks the stacks for the forms, and loads a new form onto the stack if it isn't full. However this still has the potential of causing a hang in the UI while it creates the forms. A possible solutions for this would be to put 'used' forms back onto the stack, but I feel like there may be a better way. EDIT: For control design clarification From the comments I have realized there is a lack of clarity on what exactly the control is doing. Here is a detailed explanation of one of the controls. I have defined for this control loading time as the time it takes from when a user performs an action that would open a control, until the time a control is accessible to be edited. The control is for entering Prescriptions for a patient in the system, it has about 5 tabbed groups with a total of about 180 controls. The user selects to open a new Prescription control from inside the main program, this control is loaded into the MDI Child area of the Main Form (which is a DevExpress Ribbon Control). From the time the user clicks New (or loads an existing record) until the control is visible. The list of actions that happens in the program is this: The stack is checked for the existence of a control. If the control exists it is popped off of the stack. The control is rendered on screen. This is what takes 2 seconds The control then is populated with a blank object, or with existing data. The control is ready to use. The average percentage of loading time, across about 10 different machines, with different hardware the control rendering takes about 85 - 95 percent of the control loading time. Without using the stack the control takes about 2 seconds to load, with the stack it takes about .8 seconds, this second time is acceptable. I have looked at Henry's link and I had previously already implemented the applicable suggestions. Again I re-iterate my question as What is the best method to move controls to and from the stack with as little UI interruption as possible?

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• What's the Best Practice for Firing Manual OnClick Events?

  - by Tyler Murry

  Hey guys, I've got an XNA project that will be drawing several objects on the screen. I would like the user to be able to interact with those items. So I'm trying to build a method that checks to see which object the mouse is over, out of those which is the top most, and then fire an OnClick event for that object. Checking for the things above is not the problem, but where to actually put that logic is most of the issue. My initial feeling is that the checking should be handled by a master object - since it doesn't make sense for an object, who ideally knows only about itself, to determine information about the other objects. However, calling OnClick events remotely from the master object seems to be counter-intuitive as well. What's the best practice in this situation? Thanks, Tyler

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• PHP OOP Concepts (Value Objects / Data Access Objects)

  - by Iuhiz

  Hi, I've just started to learn PHP OOP, previously I have been doing PHP in a procedural manner. I was reading this article and I've got a couple of quick questions, How is the constructor for value objects commonly defined? As one that takes in all "data members" as parameters or stick to the default constructor and use mutator / accessor methods to set / get data members? Is this actually the recommended way to start doing PHP OOP? Cos honestly, the concepts explained in the article was a tad confusing for me. Cheers

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• Business Logic Layer Pattern on Rails? MVCL

  - by Fabiano PS

  That is a broad question, and I appreciate no short/dumb asnwers like: "Oh that is the model job, this quest is retarded (period)" PROBLEM Where I work at people created a system over 2 years for managing the manufacture process over demand in the most simplified still broad as possible, involving selling, buying, assemble, The system is coded over Ruby On Rails. The app has been changed lots of times and the result is a mess on callbacks (some are called several times), 200+ models, and fat controllers: Total bad. The QUESTION is, if there is a gem, or pattern designed to handle Rails large app logic? The logic whould be able to fully talk to models (whose only concern would be data format handling and validation) What I EXPECT is to reduce complexity from various controllers, and hard to track callbacks into files with the responsibility to handle a business operation logic. In some cases there is the need to wait for a response, in others, only validation of the input is enough and a bg process would take place. ie: -- Sell some products (need to wait the operation to finish) 1. Set a View able to get the products input 2. Controller gets the product list inputed by employee and call the logic Logic::ExecuteWithResponse('sell', 'products', :prods => @product_list_with_qtt, :when => @date, :employee => current_user() ) This Logic would handle buying order, assemble order, machine schedule, warehouse reservation, and others. Have in mind that a callback on SalesOrder is not enough, since it depends on where it is called (no field for that), depends on the class of the user, among other stuff not visible for the model, or in some cases it would take long for the model to process.

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• WPF: How to specify units in Dialog Units?

  - by Ian Boyd

  i'm trying to figure out how to layout a simple dialog in WPF using the proper dialog units (DLUs). i spent about two hours dimensioning this sample dialog box from Windows Vista with the various dlu measurements. Can someone please give the corresponding XAML markup that generates this dialog box? (Image Link) Now admittedly i know almost nothing about WPF XAML. Every time i start, i get stymied because i cannot figure out how to place any control. It seems that everything in WPF must be contained on a panel of some kind. There's StackPanels, FlowPanels, DockPanel, Grid, etc. If you don't have one of these then it won't compile. The only XAML i've been able to come up with (uing XAMLPad) so far: <DockPanel xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"> <Image Width="23" /> <Label>Are you sure you want to move this file to the Recycle Bin?</Label> <Image Width="60" /> <Label>117__6.jpg</Label> <Label>Type: ACDSee JPG Image</Label> <Label>Rating: Unrated</Label> <Label>Dimensions: 1072 × 712</Label> <Button Content="Yes" Width="50" Height="14"/> <Button Content="Cancel" Width="50" Height="14"/> </DockPanel> Which renders as a gaudy monstrosity. None of the controls are placed or sized right. i cannot figure out how to position controls in a window, nor size them properly. Can someone turn that screenshot into XAML? Note: You're not allowed to measure the screenshot. All the Dialog Unit (dlu) widths and heights are specified. Note: 1 horizontal DLU != 1 vertical DLU. Horizontal and vertical DLUs are different sizes. Links Microsoft User Experience Guidelines: Recommended sizing and spacing Microsoft User Experience Guidelines: Layout Metrics Bump: 2011/05/14 (15 months later)

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• Flowcharting tool/add-in for Visual Studio

  - by Rajah

  A 2 part question: Are flow-charts, as tool to analyze source-code, no longer considered useful? The reason I ask this question is that if you Google for source-code to flowchart tools for Visual Studio, there are no relevant results. Also, Microsoft does not seem to have a tool for this purpose. Are people just not using flowcharts that much any more? (I find them to be a great way to document complex logic in my code). Are there any VS tools that can take .Net (C#, VB.Net) code and convert it to a flowchart? (The only tool that I found is Aviosto's Visustin, which does not provide VS integration). Any other tools that you can recommend for this purpose?

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• In C#, why should I use the 'var' data type?

  - by mcass20

  In C#, is there any reason to use the var data type other than to reduce "code noise"? I'm struggling to see a real value here.

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• linq2sql - where to enlist transaction (repository or bll)?

  - by Caroline Showden

  My app uses a business layer which calls a repository which uses linq to sql. I have an Item class that has an enum type property and an ItemDetail property. I need to implement a delete method that: (1) always delete the Item (2) if the item.type is XYZ and the ItemDetail is not null, delete the ItemDetail as well. My question is where should this logic be housed? If I have it in my business logic which I would prefer, this involves two separate repository calls, each of which uses a separate datacontext. I would have to wrap both calls is a System.Transaction which (in sql 2005) get promoted to a distributed transaction which is not ideal. I can move it all to a single repository call and the transaction will be handled implicitly by the datacontext but feel that this is really business logic so does not belong in the repository. Thoughts? Carrie

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• Give WPF design mode default objects

  - by Janko R

  In my application I have <Rectangle.Margin> <MultiBinding Converter="{StaticResource XYPosToThicknessConverter}"> <Binding Path="XPos"/> <Binding Path="YPos"/> </MultiBinding> </Rectangle.Margin> The Data Context is set during runtime. The application works, but the design window in VS does not show a preview but System.InvalidCastException. That’s why I added a default object in the XYPosToThicknessConverter which is ugly. class XYPosToThicknessConverter : IMultiValueConverter { public object Convert(object[] values, Type targetType, object parameter, System.Globalization.CultureInfo culture) { // stupid check to give the design window its default object. if (!(values[0] is IConvertible)) return new System.Windows.Thickness(3, 3, 0, 0); // useful code and exception throwing starts here // ... } } My Questions: What does VS/the process that builds the design window pass to XYPosToThicknessConverter and what is way to find it out by myself. How do I change my XAML code, so that the design window gets its default object and is this the best way to handle this problem? I’m using VS2010RC with Net4.0

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• Working with jTempalte and objects

  - by Dejan.S

  EDITSolved the one object question I had at first Hi I'm using jTemplate for the first time. I been reading and it's not that hard to use it BUT I just found a examaple on one object use. <script type="text/html" id="TemplateREsultTable"> <div style="background-color: #ccc">{$T.Email}</div> <div style="background-color: #ddd">{$T.Password}</div> </script> One question about jTempaltes I got is what is better to do them in htm file or script? Another thought I got, is jTemplate the way to go?

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