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• Application built using VS2010 does not work in VS-Express2008 - C

  - by Jamie Keeling

  Hello, I have wrote an application that consists of two projects in a solution, each project contains only 1 .c source file. I was using Visual Studio 2010 Ultimate but due to the University only supporting 2008 I decided to create a blank solution and copy the source files into the new one. After creating a new solution in VS2008 express, creating two projects and re-creating and adding the source files to the projects I ran the application. For some reason only one part of the application does not work, I use CreateProcess() to execute "Project1.exe" from Project 2. This works fine under vs2010 but for some reason it's not working under VS2008 express, GetLastError() is showing an Error 2: File Not Found. This is an image showing the same code in both IDE's: I'm not using anything special and I've made sure that both solutions/projects are using .Net 3.5. I can't work out why it would work for one IDE and not the other. Any suggestions? Thanks!

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• Controlling CodeModel's code output formatting: putting lines between namespace declarations

  - by devoured elysium

  I'm making some experiments with Visual Studio's CodeModel. I tried creating a file with two namespaces in there through VS's Code Model: CodeModel codeModel = projItem.ContainingProject.CodeModel; codeModel.AddNamespace("Namespaces.FirstNamespace", "namespacestest.cs"); codeModel.AddNamespace("Namespaces.SecondNamespace", "namespacestest.cs"); the output of such code is: //file namespacestest.cs namespace Namespaces.FirstNamespace { } namespace Namespaces.SecondNamespace { } Which is almost what I'm looking for. The only catch here is that I'd like to control the spacing: having at least one line between the first and the second namespace. Does by chance anyone know of a way of achieving this? This is what I want: //file namespacestest.cs namespace Namespaces.FirstNamespace { } namespace Namespaces.SecondNamespace { } Thanks

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• Making Visual C++ DLL from C++ class

  - by prosseek

  I have the following C++ code to make dll (Visual Studio 2010). class Shape { public: Shape() { nshapes++; } virtual ~Shape() { nshapes--; }; double x, y; void move(double dx, double dy); virtual double area(void) = 0; virtual double perimeter(void) = 0; static int nshapes; }; class __declspec(dllexport) Circle : public Shape { private: double radius; public: Circle(double r) : radius(r) { }; virtual double area(void); virtual double perimeter(void); }; class __declspec(dllexport) Square : public Shape { private: double width; public: Square(double w) : width(w) { }; virtual double area(void); virtual double perimeter(void); }; I have the __declspec, class __declspec(dllexport) Circle I could build a dll with the following command CL.exe /c example.cxx link.exe /OUT:"example.dll" /DLL example.obj When I tried to use the library, Square* square; square->area() I got the error messages. What's wrong or missing? example_unittest.obj : error LNK2001: unresolved external symbol "public: virtual double __thiscall ... Square::area(void)" (?area@Square@@UAENXZ) ADDED Following wengseng's answer, I modified the header file, and for DLL C++ code, I added #define XYZLIBRARY_EXPORT However, I still got errors. example_unittest.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: __th iscall Circle::Circle(double)" (__imp_??0Circle@@QAE@N@Z) referenced in function "protected: virtual void __thiscall TestOne::SetUp(void)" (?SetUp@TestOne@@MAEXXZ) example_unittest.obj : error LNK2019: unresolved external symbol "__declspec(dllimport) public: __th iscall Square::Square(double)" (__imp_??0Square@@QAE@N@Z) referenced in function "protected: virtual void __thiscall TestOne::SetUp(void)" (?SetUp@TestOne@@MAEXXZ) example_unittest.obj : error LNK2001: unresolved external symbol "public: virtual double __thiscall Square::area(void)" (?area@Square@@UAENXZ) example_unittest.obj : error LNK2001: unresolved external symbol "public: virtual double __thiscall Square::perimeter(void)" (?perimeter@Square@@UAENXZ) example_unittest.obj : error LNK2001: unresolved external symbol "public: virtual double __thiscall Circle::area(void)" (?area@Circle@@UAENXZ) example_unittest.obj : error LNK2001: unresolved external symbol "public: virtual double __thiscall Circle::perimeter(void)" (?perimeter@Circle@@UAENXZ)

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• Using the same modules in multiple projects

  - by Andreas Vinther

  I'm using Visual Studio 2010 and coding in VB.NET. My problem is that I've collected all the modules I've written and intend to reuse and placed them in a separate folder. When I want to add a module from the above folder to any given project, it takes a copy of the module and places in the project's source code folder, instead of referencing the module in the folder containing all the other modules. Is it possible to include a module in my project and leave it in the folder with all the other modules, so that when I improve upon a module, it'll affect all the projects that uses/references that module. Instead of me having to manually copy the new module to all the projects that uses/references the module. Right now I have multiple instances of the exact same module that i need to update manually when I improve code or add functionality?

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• Why MSVS Create lib file every time?

  - by codevania

  The problem is that Visual Stuiod re-create lib everytime. How can I make MSVS does not re-create? I don't know why MSVS create some kind of project's "lib" file whenever I press F5 to debug application. I just converted a solution file from 2005 to 2010. And this problem is occured. [ Revival ] 1.Build solution. 2.Debug 3.Stop debug 4.No source code change 5.Debug (re-create lib) I think that re-creation lib is not necessary. Re-creation lib file takes just a second. But it is little annoying. I'm in desperate need of your help.

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• Problem with Command Pattern under Visual Studio 2008 (C++)

  - by D.Giunchi

  Dear All, I've a problem with this pattern under c++ on VS 2008. The same code has been tested in gcc (linux, mac and mingw for widnows) and it works. I copy/paste the code here: class MyCommand { public: virtual void execute() = 0; virtual ~MyCommand () {}; }; class MyOperation { public: virtual void DoIt() {}; //I also write it not inline }; class MyOperationDerived : public MyOperation { public: virtual void DoIt() {}; //I also write it not inline }; class MyUndoStackCommand : public MyCommand { public: typedef void(MyOperation::*Action)(); MyUndoStackCommand(MyOperation *rec, Action action); /*virtual*/ void execute(); /*virtual*/ ~MyUndoStackCommand(); private: MyOperation *myReceiver; Action myAction ; }; in cpp: #include "MyUndoStackCommand.h" #include "MyOperation.h" MyUndoStackCommand::~MyUndoStackCommand() { } MyUndoStackCommand::MyUndoStackCommand(myOperation *rec, Action action): myReceiver(rec), myAction(action) { } void MyUndoStackCommand::execute() { ((myReceiver)->*(myAction))(); } use in main.cpp: MyReceiver receiver; MyUndoStackCommand usc(&receiver, &MyOperation::DoIt); usc.execute(); when I debug under visual studio only if I set inside MyUndoStackCommand, directly myAction = &MyOperation::DoIt , it works, otherwise not. Any advice? thank you very much, dan Edit: The following code compiles with g++ - changes by Neil Butterworth flagged as //NB. class MyCommand { public: virtual void execute() = 0; virtual ~MyCommand () {}; }; class MyOperation { public: virtual void DoIt() {}; //I also write it not inline }; class MyOperationDerived : public MyOperation { public: virtual void DoIt() {}; //I also write it not inline }; class MyUndoStackCommand : public MyCommand { public: typedef void(MyOperation::*Action)(); MyUndoStackCommand(MyOperation *rec, Action action); /*virtual*/ void execute(); /*virtual*/ ~MyUndoStackCommand(); private: MyOperation *myReceiver; Action myAction ; }; MyUndoStackCommand::~MyUndoStackCommand() { } MyUndoStackCommand::MyUndoStackCommand(MyOperation *rec, //NB Action action) : myReceiver(rec), myAction(action) { } void MyUndoStackCommand::execute() { ((myReceiver)->*(myAction))(); } int main() { MyOperation receiver; //NB MyUndoStackCommand usc(&receiver, &MyOperation::DoIt); usc.execute(); }

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• Better understanding of my SQL transactions

  - by Slew Poke

  I just realized that my application was needlessly making 50+ database calls per user request due to some hidden coding -- hidden in the sense that between LINQ, persistence frameworks and events it just so turned out that a huge number of calls were being made without me being aware. Is there a recommended way to analyze individual transactions going to my SQL 2008 database, preferably with some integration to my Visual Studio 2010 environment? I want to be able to 'spy' on individual transactions being made, but only for certain pieces of my code, and without making serious changes to either the code or database.

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• An error occurred loading a configuration file: Failed to start monitoring changes because the netwo

  - by Josh Stodola

  This error just started happening this morning in one particular project. When I try to publish the site it gives me this error and I can't complete the publish! Sometimes restarting Visual Studio magically fixes the problem, but it will just appear again later. Not only that, when I restart VS I lose all my "undo capabilities". There is a KB article on the subject, but it did not help. What can I do to stop this very annoying problem once and for all?

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• Is it possible to manipulate the format on a DataGridView that is bound to a Data Source?

  - by Jack Johnstone

  I´m using SQL Server 2005 and Visual Studio 2008, C#. In the data source (the SQL Server data table) I use the date format mm/dd/yyyy, however, in a forms overview (DataGridView) users would like to see a completely other format, with year, week number and day number of week (yyww,d). I´ve created an algorithm for this transformation, but can I populate the affected cells with yyww,d instead of mm/dd/yyyy? And in that case - how would I do it? I guess I need to do it after the cells are populated, but before they are shown. The generic question is - how do I manipulate the format of Data Source bound DataGridView cells.

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• how to debug VC++ program, input file not open while debuging

  - by zeedotcom

  i am using Visual studio 8. i pass command line argument to my program when i execute the program using exe file it works fine but when i use to debugg. it is unable to open the input file which i have given it in the form of command line argument. although i have given the command line argument in the Project-properties-debug-command line arguments.... e.g "program.exe" input_file output_file input file contains data which i have to use in the calculation if i am unable to debug it. how can i remove the errors in my program reply me thanks

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• How can I get all the .pdb files in the same folder?

  - by uvts_cvs

  I have a solution in Visual Studio 2008, it has dozens of projects. I would like to have all the pdb in the same folder. From the property page of a project I see that the pdb will go to the "Intermediate Directory"; also .obj files go to the "Intermediate Directory". Each of our projects has its own folder because we want to keep the .obj separated, at the same time I would like to have all the pdb in the same folder. Looking at the buildlog.htm I see the option /PDB which controls the pdb path, this option doesn't seem to me available in the property page. Maybe I will have to use a post buil script?

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• The type initializer for {Data.DataModule} threw an exception.

  - by squirms

  In visual basic, when in the "frmMain Events: Load", I get the following error The type initializer for 'projData.projDataModule' threw an exception. when running the code: var = 180 "var" is defined in projDataModule as Module projDataModule Public var As Double End Module When I rebuild the solution, It says "0 errors, 0 warnings" and will actually compile, however the Error list shows the following error: Error 1 Custom tool error: Failed to generate file: There is an error in XML document (1, 1). I:\Documents and Settings\Bill\Desktop\Projects\Data\My Project\Application.myapp 1 1 Data Any ideas or help at all would be greatly appreciated. Thanks in advance.

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• Model binding broke after upgrade to Visual Studio 2010

  - by John

  I have an ASP.net MVC 1.0 VS2008 application that I just opened in Visual Studio 2010. When I did this Studio upgraded the app from VS2008 to the VS2010 project. It also upgraded the MVC references from 1.0 to 2.0. In my app I have a class for a form post, I then use the class for the model binding in the Action method so it will auto populate the values. This worked fine in mvc 1.0 but now it does not work in 2.0 after the upgrade. Does does anyone know why? Or where I should look to resolve this? Here is my class, public class Add_Postal_Form_Input { public string ACTION_RDO { get; set; } public string POSTALSELECT { get; set; } public string CNY_CD { get; set; } public string S_PST_LOW { get; set; } public string R_PST_LOW { get; set; } public string R_PST_HI { get; set; } public string G_PST_LOW { get; set; } public string G_GRP_CD { get; set; } public string CAT_CD { get; set; } public string SUB_CD { get; set; } public string ATTR_VAL { get; set; } public string NBG_HR { get; set; } public string NBG_MN { get; set; } public string REC_STT_DT { get; set; } public string REC_END_DT { get; set; } public string DEFAULT_DATE { get; set; } } Here is the method, [AcceptVerbs("POST")] public PartialViewResult AddData(Add_Postal_Form_Input FORM_IN) { Thanks

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• How do you insert new entries into an Access db table through an ASP.net website?

  - by CGF

  I need to insert new records into an Access database. I'm using Visual Studio 2008 and firstly create a asp.net website. I can connect to the information in Access databse using dataview or gridview and can query a particular entry (ie. Proposal No. -brings up all details linking to that proposal). I can then edit the details of that proposal and this would update the Access Db. What I need to do is to have a form that simply enters new details for a new customer. ie. Enter name [__] Enter Adress[__]. Then for this to update the database. By using the gridview or dataview I am able to view all fields that exist in the table and edit them. Is there a way that I can get a blank gridview/dataview template (which includes all the fields in the table) and fill it out to then update the database? Thanks

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• How do I get Visual Studio build process to pass condition to library(external) project

  - by Billy Talented

  I have tried several solutions for this problem. Enough to know I do not know enough about MSBuild to do this elegantly but I feel like there should be a method. I have a set of libraries for working with .net projects. A few of the projects utilize System.Web.Mvc - which recently released Version 2 - and we are looking forward to the upgrade. Currently sites which reference this library reference it directly by the project(csproj) on the developer's computer - not a built version of the library so that changes and source code case easily be viewed when dealing code from this library. This works quite well and would prefer to not have to switch to binary references (but will if this is the only solution). The problem I have is that because of some of the functionality that was added onto the MVC1 based library (view engines, model binders etc) several of the sites reliant on these libraries need to stay on MVC1 until we have full evaluated and tested them on MVC2. I would prefer to not have to fork or have two copies on each dev machine. So what I would like to be able to do is set a property group value in the referencing web application and have this read by the above mentions library with the caviat that when working directly on the library via its containing solution I would like to be able to control this via Configuration Manager by selecting a build type and that property overriding the build behavior of the solution (i.e. 'Debug - MVC1' vs 'Debug -MVC2') - I have this working via: <Choose> <When Condition=" '$(Configuration)|$(Platform)' == 'Release - MVC2|AnyCPU' Or '$(Configuration)|$(Platform)' == 'Debug - MVC2|AnyCPU'"> <ItemGroup> <Reference Include="System.Web.Mvc, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL"> </Reference> <Reference Include="Microsoft.Web.Mvc, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL"> <SpecificVersion>False</SpecificVersion> <HintPath>..\Dependancies\Web\MVC2\Microsoft.Web.Mvc.dll</HintPath> </Reference> </ItemGroup> </When> <Otherwise> <ItemGroup> <Reference Include="System.Web.Mvc, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL"> <SpecificVersion>False</SpecificVersion> <HintPath>..\Dependancies\Web\MVC\System.Web.Mvc.dll</HintPath> </Reference> </ItemGroup> </Otherwise> The item that I am struggling with is the cross solution issue(solution TheWebsite references this project and needs to control which build property to use) that I have not found a way to work with that I think is a solid solution that enabled the build within visual studio to work as it has to date. Other bits: we are using VS2008, Resharper, TeamCity for CI, SVN for source control.

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• "Exception has been thrown by the target of an invocation" Running Tests - VS2008 SP1

  - by omatrot

  I'm using Visual Studio 2008 Team Suite and I'm unable to run tests and display the Test/Windows/Test Result Window. The result is a dialog box with the following content : "Exception has been thrown by the target of an invocation". Team Explorer has been installed after Visual Studio 2008 SP1. So I have re-apllied the service pack. Searching the web I found that this error is pretty common but unfortunately, the proposed solutions does not work for me. The problem was never analysed so I decided to give it a try : I reproduced the problem on a computer, attached the process with windbg and start with the basic investigations. Following are the first results : 0:000>!dumpstack OS Thread Id: 0xdb0 (0) Current frame: USER32!NtUserWaitMessage+0x15 ChildEBP RetAddr Caller,Callee 003fec94 75a32674 USER32!DialogBox2+0x222, calling USER32!NtUserWaitMessage 003fecd0 75a3288a USER32!InternalDialogBox+0xe5, calling USER32!DialogBox2 003fecfc 75a6f8d0 USER32!SoftModalMessageBox+0x757, calling USER32!InternalDialogBox 003fed3c 6eb61996 mscorwks!Thread::ReverseLeaveRuntime+0x95, calling mscorwks!_EH_epilog3 003fedb0 75a6fbac USER32!MessageBoxWorker+0x269, calling USER32!SoftModalMessageBox 003fede0 6ea559c3 mscorwks!SetupThreadNoThrow+0x19a, calling mscorwks!_EH_epilog3_catch_GS 003fee24 6eb61d8a mscorwks!HasIllegalReentrancy+0xac, calling mscorwks!_EH_epilog3 003fee30 6ea89796 mscorwks!SimpleComCallWrapper::Release+0x2e, calling mscorwks!CompareExchangeMP 003fee38 6ea0da05 mscorwks!CLRException::HandlerState::CleanupTry+0x16, calling mscorwks!GetCurrentSEHRecord 003fee44 6ea0c9c0 mscorwks!Thread::EnablePreemptiveGC+0xf, calling mscorwks!Thread::CatchAtSafePoint 003fee4c 6ea8a241 mscorwks!Unknown_Release_Internal+0x24d, calling mscorwks!GCHolder<1,0,0>::Pop 003fee50 6ea0c86c mscorwks!_EH_epilog3_catch_GS+0xa, calling mscorwks!__security_check_cookie 003fee54 6ea8a24c mscorwks!Unknown_Release_Internal+0x258, calling mscorwks!_EH_epilog3_catch_GS 003fee7c 75a16941 USER32!UserCallWinProcCheckWow+0x13d, calling ntdll!RtlDeactivateActivationContextUnsafeFast 003feed8 7082119e msenv!ATL::CComCritSecLock<ATL::CComCriticalSection>::Lock+0xd, calling ntdll!RtlEnterCriticalSection 003fef08 75a6fe5b USER32!MessageBoxIndirectW+0x2e, calling USER32!MessageBoxWorker 003fef7c 70a1e367 msenv!MessageBoxPVoidW+0xda 003fefd4 70a1db60 msenv!VBDialogCover2+0x11b 003ff01c 70a1e4c0 msenv!VBMessageBox2W+0xf0, calling msenv!VBDialogCover2 003ff044 7087246b msenv!main_GetAppNameW+0xa, calling msenv!GetAppNameInternal 003ff04c 70a1e4f2 msenv!VBMessageBox3W+0x1c, calling msenv!VBMessageBox2W 003ff064 70a1d6d7 msenv!_IdMsgShow+0x362, calling msenv!VBMessageBox3W 003ff0cc 70951841 msenv!TaskDialogCallback+0x7e0, calling msenv!_IdMsgShow 003ff118 6eb20da4 mscorwks!Unknown_QueryInterface+0x230, calling mscorwks!_EH_epilog3_catch_GS 003ff14c 6eb20c43 mscorwks!Unknown_QueryInterface_Internal+0x3d8, calling mscorwks!_EH_epilog3_catch_GS 003ff168 02006ec4 02006ec4, calling 0247a1e8 003ff16c 6ea0c86c mscorwks!_EH_epilog3_catch_GS+0xa, calling mscorwks!__security_check_cookie 003ff198 6eb20562 mscorwks!COMToCLRWorker+0xb34, calling mscorwks!_EH_epilog3_catch_GS 003ff19c 0247a235 0247a235, calling mscorwks!COMToCLRWorker 003ff1c4 7083249f msenv!CVSCommandTarget::ExecCmd+0x937 003ff1e4 7086d5c8 msenv!VsReportErrorInfo+0x11, calling msenv!TaskDialogCallback+0xd8 003ff1f8 7093e65b msenv!CVSCommandTarget::ExecCmd+0x945, calling msenv!VsReportErrorInfo 003ff25c 7081f53a msenv!ATL::CComPtr<IVsLanguageInfo>::~CComPtr<IVsLanguageInfo>+0x24, calling msenv!_EH_epilog3 003ff260 70b18d72 msenv!LogCommand+0x4c, calling msenv!ATL::CComPtr<IVsCodePageSelection>::~CComPtr<IVsCodePageSelection> 003ff264 70b18d77 msenv!LogCommand+0x51, calling msenv!_EH_epilog3 003ff280 70a4fd0e msenv!CMsoButtonUser::FClick+0x1d1, calling msenv!CVSCommandTarget::ExecCmd 003ff2f4 70823a87 msenv!CTLSITE::QueryInterface+0x16 003ff31c 70cb7d4d msenv!TBCB::FNotifyFocus+0x204 003ff35c 70ce5fda msenv!TB::NotifyControl+0x101 003ff3bc 709910f6 msenv!TB::FRequestFocus+0x4ed, calling msenv!TB::NotifyControl 003ff414 708254ba msenv!CMsoButtonUser::FEnabled+0x3d, calling msenv!GetQueryStatusFlags 003ff428 7086222a msenv!TBC::FAutoEnabled+0x24 003ff43c 7098e1eb msenv!TB::LProcessInputMsg+0xdb4 003ff458 6bec1c49 (MethodDesc 0x6bcd7f54 +0x89 System.Windows.Forms.Form.DefWndProc(System.Windows.Forms.Message ByRef)), calling 6be3b738 003ff50c 70823ab0 msenv!FPtbFromSite+0x16 003ff520 70991c43 msenv!TB::PtbParent+0x25, calling msenv!FPtbFromSite 003ff52c 708dda49 msenv!TBWndProc+0x2da 003ff588 0203d770 0203d770, calling 0247a1e8 003ff598 70822a70 msenv!CPaneFrame::Release+0x118, calling msenv!_EH_epilog3 003ff5b0 75a16238 USER32!InternalCallWinProc+0x23 003ff5dc 75a168ea USER32!UserCallWinProcCheckWow+0x109, calling USER32!InternalCallWinProc 003ff620 75a16899 USER32!UserCallWinProcCheckWow+0x6a, calling ntdll!RtlActivateActivationContextUnsafeFast 003ff654 75a17d31 USER32!DispatchMessageWorker+0x3bc, calling USER32!UserCallWinProcCheckWow 003ff688 70847f2b msenv!CMsoComponent::FPreTranslateMessage+0x72, calling msenv!MainFTranslateMessage 003ff6b4 75a17dfa USER32!DispatchMessageW+0xf, calling USER32!DispatchMessageWorker 003ff6c4 70831553 msenv!EnvironmentMsgLoop+0x1ea, calling USER32!DispatchMessageW 003ff6f8 708eb9bd msenv!CMsoCMHandler::FPushMessageLoop+0x86, calling msenv!EnvironmentMsgLoop 003ff724 708eb94d msenv!SCM::FPushMessageLoop+0xb7 003ff74c 708eb8e9 msenv!SCM_MsoCompMgr::FPushMessageLoop+0x28, calling msenv!SCM::FPushMessageLoop 003ff768 708eb8b8 msenv!CMsoComponent::PushMsgLoop+0x28 003ff788 708ebe4e msenv!VStudioMainLogged+0x482, calling msenv!CMsoComponent::PushMsgLoop 003ff7ac 70882afe msenv!CVsActivityLogSingleton::Instance+0xdf, calling msenv!_EH_epilog3 003ff7d8 70882afe msenv!CVsActivityLogSingleton::Instance+0xdf, calling msenv!_EH_epilog3 003ff7dc 707e4e31 msenv!VActivityLogStartupEntries+0x42 003ff7f4 7081f63b msenv!ATL::CComPtr<IClassFactory>::~CComPtr<IClassFactory>+0x24, calling msenv!_EH_epilog3 003ff7f8 708b250f msenv!ATL::CComQIPtr<IUnknown,&IID_IUnknown>::~CComQIPtr<IUnknown,&IID_IUnknown>+0x1d, calling msenv!_EH_epilog3 003ff820 708e7561 msenv!VStudioMain+0xc1, calling msenv!VStudioMainLogged 003ff84c 2f32aabc devenv!util_CallVsMain+0xff 003ff878 2f3278f2 devenv!CDevEnvAppId::Run+0x11fd, calling devenv!util_CallVsMain 003ff97c 77533b23 ntdll!RtlpAllocateHeap+0xe73, calling ntdll!_SEH_epilog4 003ff9f0 77536cd7 ntdll!RtlpLowFragHeapAllocFromContext+0x882, calling ntdll!RtlpSubSegmentInitialize 003ffa10 7753609f ntdll!RtlNtStatusToDosError+0x3b, calling ntdll!RtlNtStatusToDosErrorNoTeb 003ffa14 775360a4 ntdll!RtlNtStatusToDosError+0x40, calling ntdll!_SEH_epilog4 003ffa40 775360a4 ntdll!RtlNtStatusToDosError+0x40, calling ntdll!_SEH_epilog4 003ffa44 75bd2736 kernel32!LocalBaseRegOpenKey+0x159, calling ntdll!RtlNtStatusToDosError 003ffa48 75bd2762 kernel32!LocalBaseRegOpenKey+0x22a, calling kernel32!_SEH_epilog4 003ffac4 75bd2762 kernel32!LocalBaseRegOpenKey+0x22a, calling kernel32!_SEH_epilog4 003ffac8 75bd28c9 kernel32!RegOpenKeyExInternalW+0x130, calling kernel32!LocalBaseRegOpenKey 003ffad8 75bd28de kernel32!RegOpenKeyExInternalW+0x211 003ffae0 75bd28e5 kernel32!RegOpenKeyExInternalW+0x21d, calling kernel32!_SEH_epilog4 003ffb04 6f282e2b MSVCR90!_unlock+0x15, calling ntdll!RtlLeaveCriticalSection 003ffb14 75bd2642 kernel32!BaseRegCloseKeyInternal+0x41, calling ntdll!NtClose 003ffb28 75bd25d0 kernel32!RegCloseKey+0xd4, calling kernel32!_SEH_epilog4 003ffb5c 75bd25d0 kernel32!RegCloseKey+0xd4, calling kernel32!_SEH_epilog4 003ffb60 2f321ea4 devenv!DwInitSyncObjects+0x340 003ffb90 2f327bf4 devenv!WinMain+0x74, calling devenv!CDevEnvAppId::Run 003ffbac 2f327c68 devenv!License::GetPID+0x258, calling devenv!WinMain 003ffc3c 75bd3677 kernel32!BaseThreadInitThunk+0xe 003ffc48 77539d72 ntdll!__RtlUserThreadStart+0x70 003ffc88 77539d45 ntdll!_RtlUserThreadStart+0x1b, calling ntdll!__RtlUserThreadStart 0:000> !pe -nested Exception object: 050aae9c Exception type: System.Reflection.TargetInvocationException Message: Exception has been thrown by the target of an invocation. InnerException: System.NullReferenceException, use !PrintException 050aac64 to see more StackTrace (generated): SP IP Function 003FEC2C 6D2700F7 mscorlib_ni!System.RuntimeType.CreateInstanceSlow(Boolean, Boolean)+0x57 003FEC5C 6D270067 mscorlib_ni!System.RuntimeType.CreateInstanceImpl(Boolean, Boolean, Boolean)+0xe7 003FEC94 6D270264 mscorlib_ni!System.Activator.CreateInstance(System.Type, Boolean)+0x44 003FECA4 6AD02DAF Microsoft_VisualStudio_Shell_9_0_ni!Microsoft.VisualStudio.Shell.Package.CreateToolWindow(System.Type, Int32, Microsoft.VisualStudio.Shell.ProvideToolWindowAttribute)+0x67 003FED30 6AD0311B Microsoft_VisualStudio_Shell_9_0_ni!Microsoft.VisualStudio.Shell.Package.CreateToolWindow(System.Type, Int32)+0xb7 003FED58 6AD02D12 Microsoft_VisualStudio_Shell_9_0_ni!Microsoft.VisualStudio.Shell.Package.FindToolWindow(System.Type, Int32, Boolean, Microsoft.VisualStudio.Shell.ProvideToolWindowAttribute)+0x7a 003FED88 6AD02D39 Microsoft_VisualStudio_Shell_9_0_ni!Microsoft.VisualStudio.Shell.Package.FindToolWindow(System.Type, Int32, Boolean)+0x11 003FED94 02585E30 Microsoft_VisualStudio_QualityTools_TestCaseManagement!Microsoft.VisualStudio.TestTools.TestCaseManagement.QualityToolsPackage.InitToolWindowVariable[[System.__Canon, mscorlib]](System.__Canon ByRef, System.String, Boolean)+0x58 003FEDD0 02585DBE Microsoft_VisualStudio_QualityTools_TestCaseManagement!Microsoft.VisualStudio.TestTools.TestCaseManagement.QualityToolsPackage.InitToolWindowVariable[[System.__Canon, mscorlib]](System.__Canon ByRef, System.String)+0x36 003FEDE4 02585D32 Microsoft_VisualStudio_QualityTools_TestCaseManagement!Microsoft.VisualStudio.TestTools.TestCaseManagement.QualityToolsPackage.ShowToolWindow[[System.__Canon, mscorlib]](System.__Canon ByRef, System.String, Boolean)+0x3a 003FEE00 02585AB4 Microsoft_VisualStudio_QualityTools_TestCaseManagement!Microsoft.VisualStudio.TestTools.TestCaseManagement.QualityToolsPackage.OpenTestResultsToolWindow()+0x2c 003FEE10 02585A6E Microsoft_VisualStudio_QualityTools_TestCaseManagement!Microsoft.VisualStudio.TestTools.TestCaseManagement.QualityToolsPackage.OnMenuViewTestResults(System.Object, System.EventArgs)+0x6 003FEE18 6CD4F993 System_ni!System.ComponentModel.Design.MenuCommand.Invoke()+0x43 003FEE40 6CD4F9D4 System_ni!System.ComponentModel.Design.MenuCommand.Invoke(System.Object)+0x8 003FEE48 6AD000FA Microsoft_VisualStudio_Shell_9_0_ni!Microsoft.VisualStudio.Shell.OleMenuCommandService.Microsoft.VisualStudio.OLE.Interop.IOleCommandTarget.Exec(System.Guid ByRef, UInt32, UInt32, IntPtr, IntPtr)+0x11a 003FEEA0 6AD03FB8 Microsoft_VisualStudio_Shell_9_0_ni!Microsoft.VisualStudio.Shell.Package.Microsoft.VisualStudio.OLE.Interop.IOleCommandTarget.Exec(System.Guid ByRef, UInt32, UInt32, IntPtr, IntPtr)+0x44 StackTraceString: <none> HResult: 80131604 0:000> !PrintException 050aac64 Exception object: 050aac64 Exception type: System.NullReferenceException Message: Object reference not set to an instance of an object. InnerException: <none> StackTrace (generated): SP IP Function 003FE660 078E60BE Microsoft_VisualStudio_TeamSystem_Integration!Microsoft.VisualStudio.TeamSystem.Integration.TcmResultsPublishManager..ctor(Microsoft.VisualStudio.TeamSystem.Integration.ResultsPublishManager)+0xc6 003FE674 078E5C91 Microsoft_VisualStudio_TeamSystem_Integration!Microsoft.VisualStudio.TeamSystem.Integration.ResultsPublishManager..ctor(Microsoft.VisualStudio.TeamSystem.Integration.TeamFoundationHostHelper)+0x59 003FE684 078E2FA0 Microsoft_VisualStudio_TeamSystem_Integration!Microsoft.VisualStudio.TeamSystem.Integration.VsetServerHelper..ctor(System.IServiceProvider)+0x50 003FE6A4 078E2E90 Microsoft_VisualStudio_TeamSystem_Common!Microsoft.VisualStudio.TeamSystem.Integration.Client.VsetHelper.InitializeThrow(System.IServiceProvider)+0x20 003FE6B8 078E2E2A Microsoft_VisualStudio_TeamSystem_Common!Microsoft.VisualStudio.TeamSystem.Integration.Client.VsetHelper.InitializeHelper(System.IServiceProvider)+0x22 003FE6E0 078E2DEC Microsoft_VisualStudio_TeamSystem_Common!Microsoft.VisualStudio.TeamSystem.Integration.Client.VsetHelper.CreateVsetHelper(System.IServiceProvider)+0x1c 003FE6F0 078E2DAC Microsoft_VisualStudio_QualityTools_TestCaseManagement!Microsoft.VisualStudio.TestTools.TestCaseManagement.QualityToolsPackage.get_VsetHelper()+0x14 003FE6F8 02586BBE Microsoft_VisualStudio_QualityTools_TestCaseManagement!Microsoft.VisualStudio.TestTools.TestCaseManagement.ResultsToolWindow..ctor()+0x9f6 003FE798 02585F8A Microsoft_VisualStudio_QualityTools_TestCaseManagement!Microsoft.VisualStudio.TestTools.TestCaseManagement.ResultToolWindowHost..ctor()+0x1a StackTraceString: <none> HResult: 80004003 In order to be able to continue the analysis, we need to get the parameters to see what is going on. I also tried to run devenv.exe with the /log switch. No error in the log after reproducing the problem. Finally, If Team Explorer is removed from the system, the problem goes away. Any help appreciated. TIA. Olivier.

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• Generating .coverage file programmatic way with Visual Studio 2010

  - by prosseek

  I need to generate .coverage file programmatic way. This post explains a C# code to do it as follows. using System; using System.Collections.Generic; using System.Text; using System.Diagnostics; using Microsoft.VisualStudio.Coverage; using Microsoft.VisualStudio.Coverage.Analysis; // You must add a reference to Microsoft.VisualStudio.Coverage.Monitor.dll namespace Microsoft.VisualStudio { class DumpProgram { static void Main(string[] args) { Process p = new Process(); StringBuilder sb = new StringBuilder("/COVERAGE "); sb.Append("hello.exe"); p.StartInfo.FileName = "vsinstr.exe"; p.StartInfo.Arguments = sb.ToString(); p.Start(); p.WaitForExit(); // TODO: Look at return code – 0 for success // A guid is used to keep track of the run Guid myrunguid = Guid.NewGuid(); Monitor m = new Monitor(); m.StartRunCoverage(myrunguid, "hello.coverage"); // Complete the run m.FinishRunCoverage(myrunguid); Unfortunately, when I compile this code, I get the following error. bin2xml.cs(26,22): error CS0246: The type or namespace name 'Monitor' could not be found (are you missing a using directive or an assembly reference?) bin2xml.cs(26,38): error CS0246: The type or namespace name 'Monitor' could not be found (are you missing a using directive or an assembly reference?) As this post says, there are some changes between VS2008 and VS2010, I think the Monitor class is in some different namespace. What might be wrong? How can I generate the .coverage file programmatically with Visual Studio 2010? ADDED I added using System.Threading to run to get the following error. I run the command csc bin2xml.cs /r:Microsoft.VisualStudio.Coverage.Analysis.dll. bin2xml.cs(28,21): error CS0723: Cannot declare a variable of static type 'System.Threading.Monitor' bin2xml.cs(28,33): error CS0712: Cannot create an instance of the static class 'System.Threading.Monitor' bin2xml.cs(29,23): error CS1061: 'System.Threading.Monitor' does not contain a definition for 'StartRunCoverage' and no extension method 'StartRunCoverage' accepting a first argument of type 'System.Threading.Monitor' could be found (are you missing a using directive or an assembly reference?) bin2xml.cs(31,23): error CS1061: 'System.Threading.Monitor' does not contain a definition for 'FinishRunCoverage' and no extension method 'FinishRunCoverage' accepting a first argument of type 'System.Threading.Monitor' could be found (are you missing a using directive or an assembly reference?) ADDED2 I compiled the code with the following command. csc bin2xml.cs /r:Microsoft.VisualStudio.Coverage.Analysis.dll /r:Microsoft.VisualStudio.Coverage.Monitor.dll Then, I got these error messages. Monitor m = new Monitor(); is at the line 27. bin2xml.cs(27,21): error CS0246: The type or namespace name 'Monitor' could not be found (are you missing a using directive or an assembly reference?) bin2xml.cs(27,37): error CS0246: The type or namespace name 'Monitor' could not be found (are you missing a using directive or an assembly reference?)

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• Unable to connect SQL Server instance from Visual Studio 2008 Version 9.0

  - by salvationishere

  I am getting the below error from VS on an 32-bit XP Professional server even though I set Tools-Options-Database Tools-Data Connections to "SIDEKICK", which is the name of my computer. In other words SIDEKICK should default to the full SQLSERVER. In other words, I want VS to use SQLSERVER instead of SQLSERVER EXPRESS. And I can clearly see my database both from VS in the Server Explorer and also in SSMS 2008. Furthermore, I can view the tables of this database in Server Explorer from VS. I do not get any build errors. And it looks like all of the naming is consistent in my web.config file. I am developing my website according to a Microsoft tutorial, so I should not be getting an error. Yet I get the following exception when I run this code below: CreateAccounts.aspx.cs file protected void CreateAccountButton_Click(object sender, EventArgs e) { MembershipCreateStatus createStatus; //This line below is where the exception occurs MembershipUser newUser = Membership.CreateUser(Username.Text, Password.Text, Email.Text, passwordQuestion, SecurityAnswer.Text, true, out createStatus); And here is what the exception looks like: System.Web.HttpException was unhandled by user code Message="Unable to connect to SQL Server database." Source="System.Web" ErrorCode=-2147467259 StackTrace: at System.Web.DataAccess.SqlConnectionHelper.CreateMdfFile(String fullFileName, String dataDir, String connectionString) at System.Web.DataAccess.SqlConnectionHelper.EnsureSqlExpressDBFile(String connectionString) at System.Web.DataAccess.SqlConnectionHelper.GetConnection(String connectionString, Boolean revertImpersonation) at System.Web.Security.SqlMembershipProvider.CreateUser(String username, String password, String email, String passwordQuestion, String passwordAnswer, Boolean isApproved, Object providerUserKey, MembershipCreateStatus& status) at System.Web.Security.Membership.CreateUser(String username, String password, String email, String passwordQuestion, String passwordAnswer, Boolean isApproved, Object providerUserKey, MembershipCreateStatus& status) at System.Web.Security.Membership.CreateUser(String username, String password, String email, String passwordQuestion, String passwordAnswer, Boolean isApproved, MembershipCreateStatus& status) at Membership_CreatingUserAccounts.CreateAccountButton_Click(Object sender, EventArgs e) in c:\Documents and Settings\Admin\My Documents\Visual Studio 2008\WebSites\WebSite2\Membership\CreatingUserAccounts.aspx.cs:line 24 at System.Web.UI.WebControls.Button.OnClick(EventArgs e) at System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) at System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) at System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) InnerException: System.Web.HttpException Message="Unable to connect to SQL Server database." Source="System.Web" ErrorCode=-2147467259 StackTrace: at System.Web.Management.SqlServices.GetSqlConnection(String server, String user, String password, Boolean trusted, String connectionString) at System.Web.Management.SqlServices.SetupApplicationServices(String server, String user, String password, Boolean trusted, String connectionString, String database, String dbFileName, SqlFeatures features, Boolean install) at System.Web.Management.SqlServices.Install(String database, String dbFileName, String connectionString) at System.Web.DataAccess.SqlConnectionHelper.CreateMdfFile(String fullFileName, String dataDir, String connectionString) InnerException: System.Data.SqlClient.SqlException Message="The user instance login flag is not supported on this version of SQL Server. The connection will be closed." Source=".Net SqlClient Data Provider" ErrorCode=-2146232060 Class=14 LineNumber=65536 Number=18493 Procedure="" Server="." State=1 StackTrace: at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj) at System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj) at System.Data.SqlClient.SqlInternalConnectionTds.CompleteLogin(Boolean enlistOK) at System.Data.SqlClient.SqlInternalConnectionTds.AttemptOneLogin(ServerInfo serverInfo, String newPassword, Boolean ignoreSniOpenTimeout, Int64 timerExpire, SqlConnection owningObject) at System.Data.SqlClient.SqlInternalConnectionTds.LoginNoFailover(String host, String newPassword, Boolean redirectedUserInstance, SqlConnection owningObject, SqlConnectionString connectionOptions, Int64 timerStart) at System.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(SqlConnection owningObject, SqlConnectionString connectionOptions, String newPassword, Boolean redirectedUserInstance) at System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, Object providerInfo, String newPassword, SqlConnection owningObject, Boolean redirectedUserInstance) at System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection) at System.Data.ProviderBase.DbConnectionFactory.CreateNonPooledConnection(DbConnection owningConnection, DbConnectionPoolGroup poolGroup) at System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection) at System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory) at System.Data.SqlClient.SqlConnection.Open() at System.Web.Management.SqlServices.GetSqlConnection(String server, String user, String password, Boolean trusted, String connectionString) InnerException: The web.config connection string looks like: <connectionStrings> <add name="SecurityTutorialsConnectionString" connectionString="data source=.;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|SecurityTutorialsDatabase3.mdf;User Instance=true" providerName="System.Data.SqlClient"/> </connectionStrings> <system.web> <membership defaultProvider="SecurityTutorialsSqlMembershipProvider"> <providers> <add name="SecurityTutorialsSqlMembershipProvider" type="System.Web.Security.SqlMembershipProvider" connectionStringName="SecurityTutorialsConnectionString" enablePasswordRetrieval="false" enablePasswordReset="true" requiresQuestionAndAnswer="true" applicationName="SecurityTutorials" requiresUniqueEmail="true" passwordFormat="Hashed" maxInvalidPasswordAttempts="5" minRequiredPasswordLength="7" minRequiredNonalphanumericCharacters="1" passwordAttemptWindow="10" passwordStrengthRegularExpression=""/> </providers> </membership>

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• Inheritance Mapping Strategies with Entity Framework Code First CTP5: Part 3 – Table per Concrete Type (TPC) and Choosing Strategy Guidelines

  - by mortezam

  This is the third (and last) post in a series that explains different approaches to map an inheritance hierarchy with EF Code First. I've described these strategies in previous posts: Part 1 – Table per Hierarchy (TPH) Part 2 – Table per Type (TPT)In today’s blog post I am going to discuss Table per Concrete Type (TPC) which completes the inheritance mapping strategies supported by EF Code First. At the end of this post I will provide some guidelines to choose an inheritance strategy mainly based on what we've learned in this series. TPC and Entity Framework in the Past Table per Concrete type is somehow the simplest approach suggested, yet using TPC with EF is one of those concepts that has not been covered very well so far and I've seen in some resources that it was even discouraged. The reason for that is just because Entity Data Model Designer in VS2010 doesn't support TPC (even though the EF runtime does). That basically means if you are following EF's Database-First or Model-First approaches then configuring TPC requires manually writing XML in the EDMX file which is not considered to be a fun practice. Well, no more. You'll see that with Code First, creating TPC is perfectly possible with fluent API just like other strategies and you don't need to avoid TPC due to the lack of designer support as you would probably do in other EF approaches. Table per Concrete Type (TPC)In Table per Concrete type (aka Table per Concrete class) we use exactly one table for each (nonabstract) class. All properties of a class, including inherited properties, can be mapped to columns of this table, as shown in the following figure: As you can see, the SQL schema is not aware of the inheritance; effectively, we’ve mapped two unrelated tables to a more expressive class structure. If the base class was concrete, then an additional table would be needed to hold instances of that class. I have to emphasize that there is no relationship between the database tables, except for the fact that they share some similar columns. TPC Implementation in Code First Just like the TPT implementation, we need to specify a separate table for each of the subclasses. We also need to tell Code First that we want all of the inherited properties to be mapped as part of this table. In CTP5, there is a new helper method on EntityMappingConfiguration class called MapInheritedProperties that exactly does this for us. Here is the complete object model as well as the fluent API to create a TPC mapping: public abstract class BillingDetail {     public int BillingDetailId { get; set; }     public string Owner { get; set; }     public string Number { get; set; } }          public class BankAccount : BillingDetail {     public string BankName { get; set; }     public string Swift { get; set; } }          public class CreditCard : BillingDetail {     public int CardType { get; set; }     public string ExpiryMonth { get; set; }     public string ExpiryYear { get; set; } }      public class InheritanceMappingContext : DbContext {     public DbSet<BillingDetail> BillingDetails { get; set; }              protected override void OnModelCreating(ModelBuilder modelBuilder)     {         modelBuilder.Entity<BankAccount>().Map(m =>         {             m.MapInheritedProperties();             m.ToTable("BankAccounts");         });         modelBuilder.Entity<CreditCard>().Map(m =>         {             m.MapInheritedProperties();             m.ToTable("CreditCards");         });                 } } The Importance of EntityMappingConfiguration ClassAs a side note, it worth mentioning that EntityMappingConfiguration class turns out to be a key type for inheritance mapping in Code First. Here is an snapshot of this class: namespace System.Data.Entity.ModelConfiguration.Configuration.Mapping {     public class EntityMappingConfiguration<TEntityType> where TEntityType : class     {         public ValueConditionConfiguration Requires(string discriminator);         public void ToTable(string tableName);         public void MapInheritedProperties();     } } As you have seen so far, we used its Requires method to customize TPH. We also used its ToTable method to create a TPT and now we are using its MapInheritedProperties along with ToTable method to create our TPC mapping. TPC Configuration is Not Done Yet!We are not quite done with our TPC configuration and there is more into this story even though the fluent API we saw perfectly created a TPC mapping for us in the database. To see why, let's start working with our object model. For example, the following code creates two new objects of BankAccount and CreditCard types and tries to add them to the database: using (var context = new InheritanceMappingContext()) {     BankAccount bankAccount = new BankAccount();     CreditCard creditCard = new CreditCard() { CardType = 1 };                      context.BillingDetails.Add(bankAccount);     context.BillingDetails.Add(creditCard);     context.SaveChanges(); } Running this code throws an InvalidOperationException with this message: The changes to the database were committed successfully, but an error occurred while updating the object context. The ObjectContext might be in an inconsistent state. Inner exception message: AcceptChanges cannot continue because the object's key values conflict with another object in the ObjectStateManager. Make sure that the key values are unique before calling AcceptChanges. The reason we got this exception is because DbContext.SaveChanges() internally invokes SaveChanges method of its internal ObjectContext. ObjectContext's SaveChanges method on its turn by default calls AcceptAllChanges after it has performed the database modifications. AcceptAllChanges method merely iterates over all entries in ObjectStateManager and invokes AcceptChanges on each of them. Since the entities are in Added state, AcceptChanges method replaces their temporary EntityKey with a regular EntityKey based on the primary key values (i.e. BillingDetailId) that come back from the database and that's where the problem occurs since both the entities have been assigned the same value for their primary key by the database (i.e. on both BillingDetailId = 1) and the problem is that ObjectStateManager cannot track objects of the same type (i.e. BillingDetail) with the same EntityKey value hence it throws. If you take a closer look at the TPC's SQL schema above, you'll see why the database generated the same values for the primary keys: the BillingDetailId column in both BankAccounts and CreditCards table has been marked as identity. How to Solve The Identity Problem in TPC As you saw, using SQL Server’s int identity columns doesn't work very well together with TPC since there will be duplicate entity keys when inserting in subclasses tables with all having the same identity seed. Therefore, to solve this, either a spread seed (where each table has its own initial seed value) will be needed, or a mechanism other than SQL Server’s int identity should be used. Some other RDBMSes have other mechanisms allowing a sequence (identity) to be shared by multiple tables, and something similar can be achieved with GUID keys in SQL Server. While using GUID keys, or int identity keys with different starting seeds will solve the problem but yet another solution would be to completely switch off identity on the primary key property. As a result, we need to take the responsibility of providing unique keys when inserting records to the database. We will go with this solution since it works regardless of which database engine is used. Switching Off Identity in Code First We can switch off identity simply by placing DatabaseGenerated attribute on the primary key property and pass DatabaseGenerationOption.None to its constructor. DatabaseGenerated attribute is a new data annotation which has been added to System.ComponentModel.DataAnnotations namespace in CTP5: public abstract class BillingDetail {     [DatabaseGenerated(DatabaseGenerationOption.None)]     public int BillingDetailId { get; set; }     public string Owner { get; set; }     public string Number { get; set; } } As always, we can achieve the same result by using fluent API, if you prefer that: modelBuilder.Entity<BillingDetail>()             .Property(p => p.BillingDetailId)             .HasDatabaseGenerationOption(DatabaseGenerationOption.None); Working With The Object Model Our TPC mapping is ready and we can try adding new records to the database. But, like I said, now we need to take care of providing unique keys when creating new objects: using (var context = new InheritanceMappingContext()) {     BankAccount bankAccount = new BankAccount()      {          BillingDetailId = 1                          };     CreditCard creditCard = new CreditCard()      {          BillingDetailId = 2,         CardType = 1     };                      context.BillingDetails.Add(bankAccount);     context.BillingDetails.Add(creditCard);     context.SaveChanges(); } Polymorphic Associations with TPC is Problematic The main problem with this approach is that it doesn’t support Polymorphic Associations very well. After all, in the database, associations are represented as foreign key relationships and in TPC, the subclasses are all mapped to different tables so a polymorphic association to their base class (abstract BillingDetail in our example) cannot be represented as a simple foreign key relationship. For example, consider the the domain model we introduced here where User has a polymorphic association with BillingDetail. This would be problematic in our TPC Schema, because if User has a many-to-one relationship with BillingDetail, the Users table would need a single foreign key column, which would have to refer both concrete subclass tables. This isn’t possible with regular foreign key constraints. Schema Evolution with TPC is Complex A further conceptual problem with this mapping strategy is that several different columns, of different tables, share exactly the same semantics. This makes schema evolution more complex. For example, a change to a base class property results in changes to multiple columns. It also makes it much more difficult to implement database integrity constraints that apply to all subclasses. Generated SQLLet's examine SQL output for polymorphic queries in TPC mapping. For example, consider this polymorphic query for all BillingDetails and the resulting SQL statements that being executed in the database: var query = from b in context.BillingDetails select b; Just like the SQL query generated by TPT mapping, the CASE statements that you see in the beginning of the query is merely to ensure columns that are irrelevant for a particular row have NULL values in the returning flattened table. (e.g. BankName for a row that represents a CreditCard type). TPC's SQL Queries are Union Based As you can see in the above screenshot, the first SELECT uses a FROM-clause subquery (which is selected with a red rectangle) to retrieve all instances of BillingDetails from all concrete class tables. The tables are combined with a UNION operator, and a literal (in this case, 0 and 1) is inserted into the intermediate result; (look at the lines highlighted in yellow.) EF reads this to instantiate the correct class given the data from a particular row. A union requires that the queries that are combined, project over the same columns; hence, EF has to pad and fill up nonexistent columns with NULL. This query will really perform well since here we can let the database optimizer find the best execution plan to combine rows from several tables. There is also no Joins involved so it has a better performance than the SQL queries generated by TPT where a Join is required between the base and subclasses tables. Choosing Strategy GuidelinesBefore we get into this discussion, I want to emphasize that there is no one single "best strategy fits all scenarios" exists. As you saw, each of the approaches have their own advantages and drawbacks. Here are some rules of thumb to identify the best strategy in a particular scenario: If you don’t require polymorphic associations or queries, lean toward TPC—in other words, if you never or rarely query for BillingDetails and you have no class that has an association to BillingDetail base class. I recommend TPC (only) for the top level of your class hierarchy, where polymorphism isn’t usually required, and when modification of the base class in the future is unlikely. If you do require polymorphic associations or queries, and subclasses declare relatively few properties (particularly if the main difference between subclasses is in their behavior), lean toward TPH. Your goal is to minimize the number of nullable columns and to convince yourself (and your DBA) that a denormalized schema won’t create problems in the long run. If you do require polymorphic associations or queries, and subclasses declare many properties (subclasses differ mainly by the data they hold), lean toward TPT. Or, depending on the width and depth of your inheritance hierarchy and the possible cost of joins versus unions, use TPC. By default, choose TPH only for simple problems. For more complex cases (or when you’re overruled by a data modeler insisting on the importance of nullability constraints and normalization), you should consider the TPT strategy. But at that point, ask yourself whether it may not be better to remodel inheritance as delegation in the object model (delegation is a way of making composition as powerful for reuse as inheritance). Complex inheritance is often best avoided for all sorts of reasons unrelated to persistence or ORM. EF acts as a buffer between the domain and relational models, but that doesn’t mean you can ignore persistence concerns when designing your classes. SummaryIn this series, we focused on one of the main structural aspect of the object/relational paradigm mismatch which is inheritance and discussed how EF solve this problem as an ORM solution. We learned about the three well-known inheritance mapping strategies and their implementations in EF Code First. Hopefully it gives you a better insight about the mapping of inheritance hierarchies as well as choosing the best strategy for your particular scenario. Happy New Year and Happy Code-Firsting! References ADO.NET team blog Java Persistence with Hibernate book a { color: #5A99FF; } a:visited { color: #5A99FF; } .title { padding-bottom: 5px; font-family: Segoe UI; font-size: 11pt; font-weight: bold; padding-top: 15px; } .code, .typeName { font-family: consolas; } .typeName { color: #2b91af; } .padTop5 { padding-top: 5px; } .padTop10 { padding-top: 10px; } .exception { background-color: #f0f0f0; font-style: italic; padding-bottom: 5px; padding-left: 5px; padding-top: 5px; padding-right: 5px; }

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• Link List Implementation Help - Visual C++

  - by Greenhouse Gases

  Hi there I'm trying to implement a link list which stores the city name (though you will see this commented out as I need to resolve the issue of not being able to use string and needing to use a primitive data type instead during the declaration), longitude, latitude and of course a pointer to the next node in the chain. I am new to the Visual C++ environment and my brain is somewhat scrambled after coding for several straight hours today so I wondered if anyone could help resolve the 2 errors I am getting (ignore the #include syntax as I had to change them to avoid the browser interpreting html!): 1U08221.obj : error LNK2028: unresolved token (0A000298) "public: __thiscall Locations::Locations(void)" (??0Locations@@$$FQAE@XZ) referenced in function "int __clrcall main(cli::array^)" (?main@@$$HYMHP$01AP$AAVString@System@@@Z) 1U08221.obj : error LNK2019: unresolved external symbol "public: __thiscall Locations::Locations(void)" (??0Locations@@$$FQAE@XZ) referenced in function "int __clrcall main(cli::array^)" (?main@@$$HYMHP$01AP$AAVString@System@@@Z) The code for my header file is here: include string struct locationNode { //char[10] nodeCityName; double nodeLati; double nodeLongi; locationNode* Next; }; class Locations { private: int size; public: Locations(); // constructor for the class locationNode* Head; int Add(locationNode* Item); }; and here is the code for the file containing the main method: // U08221.cpp : main project file. include "stdafx.h" include "Locations.h" include iostream include string using namespace std; int n = 0; int x; string cityNameInput; bool acceptedInput = false; int Locations::Add(locationNode *NewItem) { locationNode *Sample = new locationNode; Sample = NewItem; Sample-Next = Head; Head = Sample; return size++; } void CorrectCase(string name) // Correct upper and lower case letters of input { x = name.size(); int firstLetVal = name[0], letVal; n = 1; // variable for name index from second letter onwards if((name[0] 90) && (name[0] < 123)) // First letter is lower case { firstLetVal = firstLetVal - 32; // Capitalise first letter name[0] = firstLetVal; } while(n <= x - 1) { if((name[n] = 65) && (name[n] <= 90)) { letVal = name[n] + 32; name[n] = letVal; } n++; } cityNameInput = name; } void nameValidation(string name) { n = 0; // start from first letter x = name.size(); while(!acceptedInput) { if((name[n] = 65) && (name[n] <= 122)) // is in the range of letters { while(n <= x - 1) { while((name[n] =91) && (name[n] <=97)) // ERROR!! { cout << "Please enter a valid city name" << endl; cin name; } n++; } } else { cout << "Please enter a valid city name" << endl; cin name; } if(n <= x - 1) { acceptedInput = true; } } cityNameInput = name; } int main(array ^args) { cout << "Enter a city name" << endl; cin cityNameInput; nameValidation(cityNameInput); // check is made up of valid characters CorrectCase(cityNameInput); // corrects name to standard format of capitalised first letter, and lower case subsequent letters cout << cityNameInput; cin cityNameInput; Locations::Locations(); Locations *Parts = new Locations(); locationNode *Part; Part = new locationNode; //Part-nodeCityName = "London"; Part-nodeLati = 87; Part-nodeLongi = 80; Parts-Add(Part); } I am familiar with the concepts but somewhat inexperienced with OOP so am making some silly errors that you can never find when you've stared at something too long. Any help you can offer will be appreciated! Thanks

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• OOP concept: is it possible to update the class of an instantiated object?

  - by Federico

  I am trying to write a simple program that should allow a user to save and display sets of heterogeneous, but somehow related data. For clarity sake, I will use a representative example of vehicles. The program flow is like this: The program creates a Garage object, which is basically a class that can contain a list of vehicles objects Then the users creates Vehicles objects, these Vehicles each have a property, lets say License Plate Nr. Once created, the Vehicle object get added to a list within the Garage object --Later on--, the user can specify that a given Vehicle object is in fact a Car object or a Truck object (thus giving access to some specific attributes such as Number of seats for the Car, or Cargo weight for the truck) At first sight, this might look like an OOP textbook question involving a base class and inheritance, but the problem is more subtle because at the object creation time (and until the user decides to give more info), the computer doesn't know the exact Vehicle type. Hence my question: how would you proceed to implement this program flow? Is OOP the way to go? Just to give an initial answer, here is what I've came up until now. There is only one Vehicle class and the various properties/values are handled by the main program (not the class) through a dictionary. However, I'm pretty sure that there must be a more elegant solution (I'm developing using VB.net): Public Class Garage Public GarageAdress As String Private _ListGarageVehicles As New List(Of Vehicles) Public Sub AddVehicle(Vehicle As Vehicles) _ListGarageVehicles.Add(Vehicle) End Sub End Class Public Class Vehicles Public LicensePlateNumber As String Public Enum VehicleTypes Generic = 0 Car = 1 Truck = 2 End Enum Public VehicleType As VehicleTypes Public DictVehicleProperties As New Dictionary(Of String, String) End Class NOTE that in the example above the public/private modifiers do not necessarily reflect the original code

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• What OO Design to use ( is there a Design Pattern )?

  - by Blundell

  I have two objects that represent a 'Bar/Club' ( a place where you drink/socialise). In one scenario I need the bar name, address, distance, slogon In another scenario I need the bar name, address, website url, logo So I've got two objects representing the same thing but with different fields. I like to use immutable objects, so all the fields are set from the constructor. One option is to have two constructors and null the other fields i.e: class Bar { private final String name; private final Distance distance; private final Url url; public Bar(String name, Distance distance){ this.name = name; this.distance = distance; this.url = null; } public Bar(String name, Url url){ this.name = name; this.distance = null; this.url = url; } // getters } I don't like this as you would have to null check when you use the getters In my real example the first scenario has 3 fields and the second scenario has about 10, so it would be a real pain having two constructors, the amount of fields I would have to declare null and then when the object are in use you wouldn't know which Bar you where using and so what fields would be null and what wouldn't. What other options do I have? Two classes called BarPreview and Bar? Some type of inheritance / interface? Something else that is awesome?

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• Producing 64-bit builds on Windows with free software

  - by pauldoo

  Hi, I have a C++ project that I've been developing in Microsoft Visual C++ 2008 Express Edition. It has come to the point that I'd like to port to 64-bit and continue development. What is the best way to do this using free software? My thoughts so far: The Express Edition of MSVC doesn't come with 64-bit compilers, so I can install the Windows SDK to get these. I could then port my project files to nmake, and use the IDE just as a tool to debug and invoke my nmake scripts.. The downside to this is that nmake looks very poor. The example towards the end of this tutorial suggests that nmake cannot figure out source file dependences itself, and I don't know of anything equivelant to gcc -M that I could use. Another option might be to use vcbuild from the Windows SDK to produce 64-bit builds from my existing vcproj files. Preliminary investigations show that this doesn't really work, as my project files don't have the 64-bit configurations present. (Perhaps I could fudge this by adding the 64-bit configurations to the vcproj files in a text editor.) A final option might be to give up on MSVC, and port my project to the MinGW/MSYS toolchain.

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• Which language should I pick up: VB.Net or C#

  - by magius

  I'm looking to pick up either C# or VB.Net. I'd done a fair bit of VB6 programming in the past. I'm looking at getting the book, Visual Basic .NET or C#, Which to Choose? but I'm hoping that someone has read it, or used both languages and can offer advice. Should I just RTFB? Edit: Anders Sandvig raised a valid question. I'm intending to develop ActiveX applications that will be served through IE. Edit: Given that the functionality is pretty close and my favored approach to learning is to "just build it" and solve problems by looking it up on the internet, I've decided that the choice of language will be based on how easy it is to learn it. I looked around and found sites like C# Corner that supports my approach. Personal note: I wish I could also select Seb Nilsson's response as an accepted answer as well. Thanks guys for your input! Alright, then! I admit, theoretically, this topic is subjective; but a quick tally of answers seems to skew votes heavily in C#'s favor. Anyway, I'm really after experiences like what Keith's alluding to. I'm hoping he'll return to this topic and drop us a few more gems.

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• Why do not C++11's move constructor/assignment operator act as expected

  - by xmllmx

  #include <iostream> using namespace std; struct A { A() { cout << "A()" << endl; } ~A() { cout << "~A()" << endl; } A(A&&) { cout << "A(A&&)" << endl; } A& operator =(A&&) { cout << "A& operator =(A&&)" << endl; return *this; } }; struct B { // According to the C++11, the move ctor/assignment operator // should be implicitly declared and defined. The move ctor // /assignment operator should implicitly call class A's move // ctor/assignment operator to move member a. A a; }; B f() { B b; // The compiler knows b is a temporary object, so implicitly // defined move ctor/assignment operator of class B should be // called here. Which will cause A's move ctor is called. return b; } int main() { f(); return 0; } My expected output should be: A() A(A&&) ~A() ~A() However, the actual output is: (The C++ compiler is: Visual Studio 2012) A() ~A() ~A() Is this a bug of VC++? or just my misunderstanding?

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