Visual Studio 2022中Diagnostic analyzer runner内部错误修复问询

问题 #

使用Visual Studio 2022（17.4.4）开发.NET 6 C#项目时，遇到以下代码分析异常：

1. 运行代码分析后立即提示「Code analysis completed for 'projectname'」，但未显示任何警告或错误
2. 闲置VS 2-3分钟后，弹出错误栏：「Feature 'Diagnostic analyzer runner' is currently unavailable due to an internal error. [Show Stack Trace]」
3. 点击查看堆栈跟踪得到以下信息：

StreamJsonRpc.RemoteInvocationException: An item with the same key has already been added.
   at StreamJsonRpc.JsonRpc.<InvokeCoreAsync>d__143`1.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.CodeAnalysis.Remote.BrokeredServiceConnection`1.<TryInvokeAsync>d__18`1.MoveNext()
RPC server exception:
System.ArgumentException: An item with the same key has already been added.
      at System.ThrowHelper.ThrowArgumentException(ExceptionResource resource)
      at System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add)
      at Microsoft.CodeAnalysis.RemoveUnnecessarySuppressions.AbstractRemoveUnnecessaryInlineSuppressionsDiagnosticAnalyzer.<ProcessSuppressMessageAttributesAsync>d__25.MoveNext()
   --- End of stack trace from previous location where exception was thrown ---
      at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
      at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
      at Microsoft.CodeAnalysis.RemoveUnnecessarySuppressions.AbstractRemoveUnnecessaryInlineSuppressionsDiagnosticAnalyzer.<AnalyzeAsync>d__16.MoveNext()
   --- End of stack trace from previous location where exception was thrown ---
      at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
      at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
      at Microsoft.CodeAnalysis.Diagnostics.Extensions.<>c__DisplayClass9_0.<<GetPragmaSuppressionAnalyzerDiagnosticsAsync>g__AnalyzeDocumentAsync|0>d.MoveNext()
   --- End of stack trace from previous location where exception was thrown ---
      at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
      at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
      at Microsoft.CodeAnalysis.Diagnostics.Extensions.<GetPragmaSuppressionAnalyzerDiagnosticsAsync>d__9.MoveNext()
   --- End of stack trace from previous location where exception was thrown ---
      at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
      at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
      at Microsoft.CodeAnalysis.Diagnostics.Extensions.<GetAnalysisResultAsync>d__7.MoveNext()
   --- End of stack trace from previous location where exception was thrown ---
      at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
      at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
      at Microsoft.CodeAnalysis.Remote.Diagnostics.DiagnosticComputer.<AnalyzeAsync>d__10.MoveNext()
   --- End of stack trace from previous location where exception was thrown ---
      at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
      at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
      at Microsoft.CodeAnalysis.Remote.Diagnostics.DiagnosticComputer.<GetDiagnosticsAsync>d__9.MoveNext()
   --- End of stack trace from previous location where exception was thrown ---
      at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
      at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
      at Microsoft.CodeAnalysis.Remote.RemoteDiagnosticAnalyzerService.<>c__DisplayClass4_0.<<CalculateDiagnosticsAsync>b__0>d.MoveNext()
   --- End of stack trace from previous location where exception was thrown ---
      at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
      at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
      at Microsoft.CodeAnalysis.Remote.RemoteWorkspace.<>c__DisplayClass7_0`1.<<RunWithSolutionAsync>g__ProcessSolutionAsync|1>d.MoveNext()
   --- End of stack trace from previous location where exception was thrown ---
      at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
      at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
      at Microsoft.CodeAnalysis.Remote.RemoteWorkspace.<RunWithSolutionAsync>d__7`1.MoveNext()
   --- End of stack trace from previous location where exception was thrown ---
      at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
      at Microsoft.CodeAnalysis.Remote.RemoteWorkspace.<RunWithSolutionAsync>d__7`1.MoveNext()
   --- End of stack trace from previous location where exception was thrown ---
      at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
      at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
      at Microsoft.CodeAnalysis.Remote.BrokeredServiceBase.<RunWithSolutionAsync>d__11`1.MoveNext()
   --- End of stack trace from previous location where exception was thrown ---
      at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
      at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
      at Microsoft.CodeAnalysis.Remote.RemoteDiagnosticAnalyzerService.<CalculateDiagnosticsAsync>d__4.MoveNext()

修复/排查步骤 #

• 检查重复的SuppressMessage属性：堆栈指向AbstractRemoveUnnecessaryInlineSuppressionsDiagnosticAnalyzer，说明项目中存在重复的[SuppressMessage]特性（同一代码元素上多次应用了针对同一规则的抑制）。全局搜索项目中的[SuppressMessage]，排查是否有重复定义，比如同一方法、类上多次添加了相同Category和CheckId的抑制特性，删除重复项即可。
• 更新Visual Studio版本：当前使用的17.4.4是较旧的VS2022版本，这个分析器的重复键问题在后续更新中已被修复。直接升级到最新的VS2022稳定版，可解决此类已知BUG。
• 清理VS缓存：删除VS的缓存文件，路径一般为：
  • %LOCALAPPDATA%\Microsoft\VisualStudio\17.0_<随机字符>\ComponentModelCache
  • %USERPROFILE%\AppData\Local\Temp\VisualStudioTestExplorerExtensions
    清理后重启VS，再尝试运行代码分析。
• 禁用特定分析器：临时禁用RemoveUnnecessarySuppressions分析器，在项目文件（.csproj）中添加以下配置：

<PropertyGroup>
  <AnalyzerDisableRules>IDE0079</AnalyzerDisableRules>
</PropertyGroup>

或者在VS的「项目属性→代码分析→规则集」中，找到「IDE0079: Remove unnecessary suppression」并禁用，验证是否能正常运行代码分析。

• 创建空白项目测试：新建一个空的.NET 6 C#项目，运行代码分析，确认是否出现同样问题。如果空白项目正常，说明原项目存在特定代码或配置问题，可逐步迁移代码排查根源。

内容的提问来源于stack exchange，提问作者LTR