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System.InvalidOperationException at Microsoft.CodeAnalysis.CSharp.CodeFixes.AddImport.CSharpAddImportCodeFixProvider.GetDescription #1247
Description
Activity
I just noticed that the file where I was applying the quick fix had static usings and after the fix was applied, the new using was added after the static usings, causing a squiggle for newly added using in the file:
using System;
using System.Globalization;
using System.IO;
using Microsoft.CodeAnalysis.CSharp.Test.Utilities;
using Microsoft.CodeAnalysis.Test.Utilities;
using Xunit;using static Microsoft.CodeAnalysis.Test.Utilities.SharedResourceHelpers;
using static Microsoft.CodeAnalysis.DiagnosticExtensions;
using Microsoft.CodeAnalysis.CommonDiagnosticAnalyzers; // this is the added using with errorLooking at the GetDescription method, it looks like we don't know why we would reach this place. @jmarolf, do you have any ideas when this could get hit. Otherwise, I'm not sure if this is actionalble without a repro or a dump.
Ah looks like our comments crossed midstream. using static is likely the missing case.
Yes, and the type I did an add using for was a nested static type, i.e. CommonDiagnosticAnalyzers is actuall a static class, so the above added using should be "using static Microsoft.CodeAnalysis.CommonDiagnosticAnalyzers".
I wasn't able to repro the exception again though, even after restarting VS. The squiggle in the added using always shows up CTRL + DOT + ENTER
At the very least we should handle this case. I suspect that the logic which determines if a using already exists does not take static into account.
- added a commit that references this issue
on Apr 28, 2026 - added a commit that references this issue
on Aug 18, 2026 - added a commit that references this issue
on Aug 18, 2026
Got the below exception while trying to apply a quick fix to add using. I don't have a concrete repro or a dump as the exception was logged in the activity log.
System.InvalidOperationException: This program location is thought to be unreachable. at Microsoft.CodeAnalysis.CSharp.CodeFixes.AddImport.CSharpAddImportCodeFixProvider.GetDescription(INamespaceOrTypeSymbol namespaceSymbol, SemanticModel semanticModel, SyntaxNode contextNode) at Microsoft.CodeAnalysis.CodeFixes.AddImport.AbstractAddImportCodeFixProvider.<RegisterCodeFixesAsync>d__16.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Microsoft.CodeAnalysis.CodeFixes.CodeFixService.<>c__DisplayClass12_1.<<AppendFixesAsync>b__3>d.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Microsoft.CodeAnalysis.Extensions.IExtensionManagerExtensions.<PerformFunctionAsync>d__3`1.MoveNext()