unit-testing - Visual Studio 2013 无法打开测试窗口

Question

当我打开 Visual Studio 2013 并加载解决方案时，我收到一条错误消息，告诉我测试窗口无法加载。

The composition produced a single composition error. The root cause is provided below. Review the CompositionException.Errors property for more detailed information.

1) Cannot compose part 'Microsoft.VisualStudio.TestWindow.Controller.TestsServiceInternal' because a cycle exists in the dependencies between the exports being composed. To break this cycle, consider changing some imports from constructor to property injection.
Element: Microsoft.VisualStudio.TestWindow.Controller.TestsServiceInternal -->  Microsoft.VisualStudio.TestWindow.Controller.TestsServiceInternal

Resulting in: Cannot get export 'Microsoft.VisualStudio.TestWindow.Controller.TestsServiceInternal (ContractName="Microsoft.VisualStudio.TestWindow.Data.TestsService+ITestsServiceInternal")' from part 'Microsoft.VisualStudio.TestWindow.Controller.TestsServiceInternal'.
Element: Microsoft.VisualStudio.TestWindow.Controller.TestsServiceInternal (ContractName="Microsoft.VisualStudio.TestWindow.Data.TestsService+ITestsServiceInternal") -->  Microsoft.VisualStudio.TestWindow.Controller.TestsServiceInternal

The composition produced a single composition error. The root cause is provided below. Review the CompositionException.Errors property for more detailed information.

1) An operation is not legal in the current state. (Exception from HRESULT: 0x80131509)

Resulting in: An exception occurred while trying to create an instance of type 'Microsoft.VisualStudio.TestWindow.VsHost.TestWindowHost'.

Resulting in: Cannot activate part 'Microsoft.VisualStudio.TestWindow.VsHost.TestWindowHost'.
Element: Microsoft.VisualStudio.TestWindow.VsHost.TestWindowHost -->  Microsoft.VisualStudio.TestWindow.VsHost.TestWindowHost

Resulting in: Cannot get export 'Microsoft.VisualStudio.TestWindow.VsHost.TestWindowHost (ContractName="Microsoft.VisualStudio.TestWindow.Controller.IOpenResult")' from part 'Microsoft.VisualStudio.TestWindow.VsHost.TestWindowHost'.
Element: Microsoft.VisualStudio.TestWindow.VsHost.TestWindowHost (ContractName="Microsoft.VisualStudio.TestWindow.Controller.IOpenResult") -->  Microsoft.VisualStudio.TestWindow.VsHost.TestWindowHost

Resulting in: Cannot set import 'Microsoft.VisualStudio.TestWindow.Controller.TestsServiceInternal..ctor (Parameter="openResult", ContractName="Microsoft.VisualStudio.TestWindow.Controller.IOpenResult")' on part 'Microsoft.VisualStudio.TestWindow.Controller.TestsServiceInternal'.
Element: Microsoft.VisualStudio.TestWindow.Controller.TestsServiceInternal..ctor (Parameter="openResult", ContractName="Microsoft.VisualStudio.TestWindow.Controller.IOpenResult") -->  Microsoft.VisualStudio.TestWindow.Controller.TestsServiceInternal

Resulting in: Cannot get export 'Microsoft.VisualStudio.TestWindow.Controller.TestsServiceInternal (ContractName="Microsoft.VisualStudio.TestWindow.Data.TestsService+ITestsServiceInternal")' from part 'Microsoft.VisualStudio.TestWindow.Controller.TestsServiceInternal'.
Element: Microsoft.VisualStudio.TestWindow.Controller.TestsServiceInternal (ContractName="Microsoft.VisualStudio.TestWindow.Data.TestsService+ITestsServiceInternal") -->  Microsoft.VisualStudio.TestWindow.Controller.TestsServiceInternal

Visual Studio 根本无法运行测试。关闭并重新打开测试窗口会显示相同的错误。

Answer 1

这似乎是由组件模型缓存损坏引起的。

关闭 Visual Studio 的所有实例，然后导航到文件夹并将其删除。

%LOCALAPPDATA%\Microsoft\VisualStudio\12.0\ComponentModelCache

现在重新启动 Visual Studio，它应该会再次工作。