visual-studio-2019 - SpecFlow：打开功能文件会导致 NullReferenceException

问题描述

几周后，我突然在 Visual Studio 2019（专业版）中遇到了 SpecFlow 扩展的问题。它突然停止工作。首先我认为是因为 VS 的更新，但我的其他同事正在使用相同（最新）版本的 VS，并且 SpecFlow 对他们有效。

我遇到的问题是：

SpecFlow 没有设置菜单（工具 - 选项 - SpecFlow）
打开功能文件时出现 NullReferenceException（请参阅帖子末尾的活动日志条目）
打开功能文件时没有语法突出显示
没有上下文菜单

测试资源管理器仍在发现测试，我仍然可以运行它们，但不能从功能文件中运行（也不能调试步骤）。

扩展程序已正确安装并启用（据我所知）。已经尝试了以下但没有成功：

卸载并安装 SpecFlow for Visual Studio 2019 扩展
卸载 SpecFlow 并安装 Devroom
卸载 Visual Studio 2019 并重新安装

你们中的任何人对可能导致这种情况的原因有任何想法吗？

活动日志条目

<entry>
  <record>806</record>
  <time>2021/02/09 09:25:56.786</time>
  <type>Error</type>
  <source>Editor or Editor Extension</source>
  <description>System.NullReferenceException: Object reference not set to an instance of an object.&#x000D;&#x000A;
    at TechTalk.SpecFlow.VsIntegration.LanguageService.ProjectScopeFactory.&lt;.ctor&gt;b__9_0() in D:\a\1\s\TechTalk.SpecFlow.VSIXShared\LanguageService\ProjectScopeFactory.cs:line 52&#x000D;&#x000A;
    at TechTalk.SpecFlow.VsIntegration.Implementation.Utils.SynchInitializedInstance`1.EnsureInitialized()&#x000D;&#x000A;
    at TechTalk.SpecFlow.VsIntegration.LanguageService.ProjectScopeFactory.&lt;.ctor&gt;b__9_2(Project project) in D:\a\1\s\TechTalk.SpecFlow.VSIXShared\LanguageService\ProjectScopeFactory.cs:line 64&#x000D;&#x000A;
    at TechTalk.SpecFlow.VsIntegration.Implementation.Utils.SynchronizedResultCache`3.GetOrCreate(TSource source)&#x000D;&#x000A;
    at TechTalk.SpecFlow.VsIntegration.LanguageService.ProjectScopeFactory.GetProjectScope(Project project) in D:\a\1\s\TechTalk.SpecFlow.VSIXShared\LanguageService\ProjectScopeFactory.cs:line 76&#x000D;&#x000A;
    at TechTalk.SpecFlow.VsIntegration.LanguageService.GherkinLanguageServiceFactory.CreateLanguageService(ITextBuffer textBuffer) in D:\a\1\s\TechTalk.SpecFlow.VSIXShared\LanguageService\GherkinLanguageServiceFactory.cs:line 51&#x000D;&#x000A;
    at TechTalk.SpecFlow.VsIntegration.LanguageService.GherkinLanguageServiceFactory.&lt;&gt;c__DisplayClass7_0.&lt;GetLanguageService&gt;b__0() in D:\a\1\s\TechTalk.SpecFlow.VSIXShared\LanguageService\GherkinLanguageServiceFactory.cs:line 43&#x000D;&#x000A;
    at TechTalk.SpecFlow.VsIntegration.LanguageService.GherkinBufferServiceManager.&lt;&gt;c__DisplayClass3_0`1.&lt;GetOrCreate&gt;b__0() in D:\a\1\s\TechTalk.SpecFlow.VSIXShared\LanguageService\GherkinBufferServiceManager.cs:line 32&#x000D;&#x000A;
    at Microsoft.VisualStudio.Utilities.PropertyCollection.GetOrCreateSingletonProperty[T](Object key, Func`1 creator)&#x000D;&#x000A;
    at TechTalk.SpecFlow.VsIntegration.LanguageService.GherkinBufferServiceManager.GetOrCreate[TService](ITextBuffer textBuffer, Func`1 creator) in D:\a\1\s\TechTalk.SpecFlow.VSIXShared\LanguageService\GherkinBufferServiceManager.cs:line 29&#x000D;&#x000A;
    at TechTalk.SpecFlow.VsIntegration.LanguageService.GherkinLanguageServiceFactory.GetLanguageService(ITextBuffer textBuffer) in D:\a\1\s\TechTalk.SpecFlow.VSIXShared\LanguageService\GherkinLanguageServiceFactory.cs:line 43&#x000D;&#x000A;
    at TechTalk.SpecFlow.VsIntegration.GherkinFileEditor.GherkinFileClassifierProvider.&lt;&gt;c__DisplayClass3_0.&lt;GetClassifier&gt;b__0() in D:\a\1\s\TechTalk.SpecFlow.VSIXShared\GherkinFileEditor\GherkinFileClassifierProvider.cs:line 31&#x000D;&#x000A;
    at TechTalk.SpecFlow.VsIntegration.LanguageService.GherkinBufferServiceManager.&lt;&gt;c__DisplayClass3_0`1.&lt;GetOrCreate&gt;b__0() in D:\a\1\s\TechTalk.SpecFlow.VSIXShared\LanguageService\GherkinBufferServiceManager.cs:line 32&#x000D;&#x000A;
    at Microsoft.VisualStudio.Utilities.PropertyCollection.GetOrCreateSingletonProperty[T](Object key, Func`1 creator)&#x000D;&#x000A;
    at TechTalk.SpecFlow.VsIntegration.LanguageService.GherkinBufferServiceManager.GetOrCreate[TService](ITextBuffer textBuffer, Func`1 creator) in D:\a\1\s\TechTalk.SpecFlow.VSIXShared\LanguageService\GherkinBufferServiceManager.cs:line 29&#x000D;&#x000A;
    at TechTalk.SpecFlow.VsIntegration.GherkinFileEditor.GherkinFileClassifierProvider.GetClassifier(ITextBuffer buffer) in D:\a\1\s\TechTalk.SpecFlow.VSIXShared\GherkinFileEditor\GherkinFileClassifierProvider.cs:line 30&#x000D;&#x000A;
    at Microsoft.VisualStudio.Text.Classification.Implementation.ClassifierTaggerProvider.&lt;&gt;c__DisplayClass12_0`1.&lt;CreateTagger&gt;b__0(IClassifierProvider provider)&#x000D;&#x000A;
    at Microsoft.VisualStudio.Text.Utilities.GuardedOperations.InvokeEligibleFactories[TExtensionInstance,TExtensionFactory,TMetadataView](IEnumerable`1 lazyFactories, Func`2 getter, IContentType dataContentType, IContentTypeRegistryService contentTypeRegistryService, Object errorSource)&#x000D;&#x000A;--- End of stack trace from previous location where exception was thrown ---&#x000D;&#x000A;
    at Microsoft.VisualStudio.Telemetry.WindowsErrorReporting.WatsonReport.GetClrWatsonExceptionInfo(Exception exceptionObject)
  </description>
</entry>

编辑：运行 VS 修复后，我可以看到“清除 MEF 组件缓存”扩展的菜单选项。不幸的是，使用它并没有让我进一步使用 SpecFlow 扩展（仍然是同样的问题）。

标签： visual-studio-2019specflow

visual-studio-2019 - SpecFlow：打开功能文件会导致 NullReferenceException

问题描述

解决方案

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