我使用的是 Visual Studio 2022 (17.4.4)。这是一个 .NET 6 C# 项目。
在我的项目上运行代码分析时，我立即收到消息“‘projectname’的代码分析已完成”。不显示代码分析警告或错误。
当我将 Visual Studio 打开几分钟（不执行任何操作）时，2-3 分钟后会出现错误栏：
“由于内部错误，‘诊断分析器运行程序’功能当前不可用。[显示堆栈跟踪]”
当我单击“显示堆栈跟踪”时，我会得到一个堆栈跟踪（附在本文底部）。
我该如何解决此问题或进一步调查？
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()
当您遇到这样的消息时，这是一个错误。因此，您可能无法进行修复。此类错误应报告给 Microsoft。
此错误已报告 https://github.com/dotnet/roslyn/issues/50496
您必须等待修复。
我的经历类似（VS 17.7.2）。如果我只是打开一个 .cs 文件而不执行任何操作，错误就会开始出现。一旦它们开始出现，只有关闭 Visual Studio 才能让它们消失。我重新启动VS后等待几分钟后它们会重新出现。我注意到只有当我打开特定的 .cs 文件时才会发生这种情况。
我发现错误是由于一个非常长的字符串连接。我有一条长绳子，看起来像：
string longString = var1 + "," + var2 + "," ... _ var685 etc.
我对 685 个变量进行了此操作。我知道，我知道，我应该使用 stringbuilder 或 concat 或 join 等。但我认为这将是进行连接的最快方法，并且它是自动生成的。
如果我将它分成两个字符串（例如 longString1 和 longString2），然后将它们加在一起，那么错误就会消失。所以我只是将其替换为：
string longString1 = var1 + "," + var2 + "," ... _ var400;
string longString2 = var401 + "," + var402 + "," ... _ var685
string longString = longString1 + longString2;
错误就消失了。希望这有帮助。