VS 2017测试资源管理器窗口空引用异常

Question

基本上，当我使用nunit3 & specflow，在VS 2017 (15.3.2.)中打开我的解决方案时，我会在测试资源管理器窗口中得到以下异常和错误：

有没有办法解决这个问题？虽然有一个解决方法，但非常荒谬...如果我在不打开任何项目的情况下启动VS 2017，然后从最近打开的项目中打开它，那么它就能正常工作。

An exception was encountered while constructing the content of this frame.  This information is also logged in "C:\Users\USER\AppData\Roaming\Microsoft\VisualStudio\15.0_6ae63cad\ActivityLog.xml".

Exception details:
System.NullReferenceException: Object reference not set to an instance of an object.
   at Microsoft.VisualStudio.TestWindow.VsHost.TestWindowToolWindow.InvokeSwapInRealTestWindow(String eventName)
   at Microsoft.VisualStudio.TestWindow.VsHost.TestWindowToolWindow.OnToolWindowCreated()
   at Microsoft.VisualStudio.Shell.Package.CreateToolWindow(Type toolWindowType, Int32 id, UInt32 flags)
   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.CreateToolWindow(Guid& toolWindowType, Int32 id)
   at Microsoft.VisualStudio.Shell.Package.Microsoft.VisualStudio.Shell.Interop.IVsToolWindowFactory.CreateToolWindow(Guid& toolWindowType, UInt32 id)
   at Microsoft.VisualStudio.Platform.WindowManagement.WindowFrame.ConstructContent()


ActivityLog.xml content:

  <entry>
    <record>678</record>
    <time>2017/09/15 12:43:31.678</time>
    <type>Error</type>
    <source>VisualStudio</source>
    <description>Construction of frame content failed.&#x000D;&#x000A;Frame identifier: ST:0:0:{e1b7d1f8-9b3c-49b1-8f4f-bfc63a88835d}&#x000D;&#x000A;Frame caption: Test Explorer&#x000D;&#x000A;Exception details:&#x000D;&#x000A;System.NullReferenceException: Object reference not set to an instance of an object.&#x000D;&#x000A;   at Microsoft.VisualStudio.TestWindow.VsHost.TestWindowToolWindow.InvokeSwapInRealTestWindow(String eventName)&#x000D;&#x000A;   at Microsoft.VisualStudio.TestWindow.VsHost.TestWindowToolWindow.OnToolWindowCreated()&#x000D;&#x000A;   at Microsoft.VisualStudio.Shell.Package.CreateToolWindow(Type toolWindowType, Int32 id, UInt32 flags)&#x000D;&#x000A;   at Microsoft.VisualStudio.Shell.Package.CreateToolWindow(Type toolWindowType, Int32 id, ProvideToolWindowAttribute tool)&#x000D;&#x000A;   at Microsoft.VisualStudio.Shell.Package.FindToolWindow(Type toolWindowType, Int32 id, Boolean create, ProvideToolWindowAttribute tool)&#x000D;&#x000A;   at Microsoft.VisualStudio.Shell.Package.CreateToolWindow(Guid&amp; toolWindowType, Int32 id)&#x000D;&#x000A;   at Microsoft.VisualStudio.Shell.Package.Microsoft.VisualStudio.Shell.Interop.IVsToolWindowFactory.CreateToolWindow(Guid&amp; toolWindowType, UInt32 id)&#x000D;&#x000A;   at Microsoft.VisualStudio.Platform.WindowManagement.WindowFrame.ConstructContent()</description>
  </entry>

- Rain9333

---

图片错误信息并不是很有帮助，请发布实际的文本。请参阅https://meta.stackoverflow.com/questions/303812/discourage-screenshots-of-code-and-or-errors - AdrianHHH

已添加为文本。 - Rain9333

Answer 1

如果您在启动时将焦点放在Test Explorer上，则会出现此问题。临时解决方案是在关闭VisualStudio之前单击另一个选项卡（Solution explorer），这样启动时焦点不会在TestExplorer上。

参考：https://developercommunity.visualstudio.com/content/problem/117601/test-explorer-nullreferenceexception-on-startup.html

- valentinvs

---

对我来说仍然不起作用。奇怪的是，对于我的第二个项目，它看起来还好（两者都使用 Selenium 和 NUnit 3）。 - Rain9333

Answer 2

看起来问题已经解决了（至少我无法再重现它），这是通过VS2017更新15.4.1实现的。

- Rain9333