笔者的VS2010的Test Project遇到了一样的问题.

 

错误信息例子:

An exception was encountered while constructing the content of this frame.  This information is also logged by running the application with the /log parameter on the command line, which stores results in "C:\Users\sdavis\AppData\Roaming\Microsoft\VisualStudio\10.0\ActivityLog.xml".

Exception details:

System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.ArgumentException: There is already a command handler for the menu command 'b85579aa-8be0-4c4f-a850-90902b317571 : 13074'.

   at System.ComponentModel.Design.MenuCommandService.AddCommand(MenuCommand command)

   at Microsoft.VisualStudio.TestTools.Vsip.CommandHelper.AddCommand(IMenuCommandService menuService, EventHandler invokeHandler, EventHandler statusHandler, CommandID id)

   at Microsoft.VisualStudio.TestTools.TestCaseManagement.TestViewToolWindow.Initialize()

   at Microsoft.VisualStudio.TestTools.TestCaseManagement.TestViewToolWindowHost..ctor()

   --- End of inner exception stack trace ---

   at System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandleInternal& ctor, Boolean& bNeedSecurityCheck)

   at System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache)

   at System.RuntimeType.CreateInstanceDefaultCtor(Boolean publicOnly, Boolean skipVisibilityChecks, Boolean skipCheckThis, Boolean fillCache)

   at System.Activator.CreateInstance(Type type, Boolean nonPublic)

   at Microsoft.VisualStudio.Shell.Package.CreateToolWindow(Type toolWindowType, Int32 id, ProvideToolWindowAttribute tool)

   at Microsoft.VisualStudio.Shell.Package.FindToolWindow(Type toolWindowType, Int32 id, Boolean create, ProvideToolWindowAttribute tool)

   at Microsoft.VisualStudio.Shell.Package.Microsoft.VisualStudio.Shell.Interop.IVsToolWindowFactory.CreateToolWindow(Guid& toolWindowType, UInt32 id)

   at Microsoft.VisualStudio.Platform.WindowManagement.WindowFrame.ConstructContent()

 

解决方案

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重启VS2010. –_-||

 

彻底解决方案

====================

1. Go to the Tools main menu -> Options… | Test Tools

2. Check the checkbox “Show all settings” to see the Test Tools settings

3. For the condition that reads “ When changes are made to the tests and background discovery of test methods is not enabled” (#9 from the top), choose “Don’t prompt”

参考资料

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Test View return an exception

Test View Issue: An exception was encountered while constructing the content of this frame