Exception after "Convert to C#" in unsaved window

[JohnRosePLI]

Hello,

When I want to translate any VB.NET Code to C# in Visual Studio 2022 I get the following error message:

Regards John

[GrahamTheCoder]

Looks like an odd error. Since the code converter isn't shown in the stack trace I'll need a bit more info.
Could you let me know which menu item you are using. E.g. Is it the right click menu in solution explorer on a single file? Feel free to screenshot if easier to describe.
The other useful things would be to know if this happens instantly, whether the code converter section of the output window shows anything, and if this happens even when all files are already saved since it seems related to saving.
Visual studio's about window has a copy info button which lists other installed extensions which could be interacting here too.

Thanks!

[GrahamTheCoder]

Thanks I've now actually managed to reproduce this issue.
It happens when you use the right click menu within a code editor, or on the Edit menu to convert a single file that has unsaved changes. Once it's occurred, the code editor will be in a broken state (and prevent any other attempts at conversion) until you close the unsaved file (you'll no longer be able to save it).

Workaround: Save all changes before running conversion

I've spent a bit of time looking at making a fix to automatically do this but haven't succeeded yet by running the Dte.SaveAll command

For my own reference, the full stack trace is

 	Microsoft.VisualStudio.CommonIDE.dll!Microsoft.VisualStudio.CommonIDE.Solutions.Dte.IdeAutomationObject<System.__Canon>.RunOnMainThreadHr.AnonymousMethod__21_0(System.Func<int> innerFunc)	Unknown
>	ICSharpCode.CodeConverter.VsExtension.dll!ICSharpCode.CodeConverter.VsExtension.VisualStudioInteraction.EnsureBuiltAsync(System.Collections.Generic.IReadOnlyCollection<EnvDTE.Project> projects, System.Func<string, System.Threading.Tasks.Task> writeMessageAsync) Line 197	C#
 	[Resuming Async Method]	
 	mscorlib.dll!System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, object state, bool preserveSyncCtx)	Unknown
 	mscorlib.dll!System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, object state, bool preserveSyncCtx)	Unknown
 	mscorlib.dll!System.Runtime.CompilerServices.AsyncMethodBuilderCore.MoveNextRunner.Run()	Unknown
 	mscorlib.dll!System.Runtime.CompilerServices.AsyncMethodBuilderCore.OutputAsyncCausalityEvents.AnonymousMethod__0()	Unknown
 	mscorlib.dll!System.Runtime.CompilerServices.TaskAwaiter.OutputWaitEtwEvents.AnonymousMethod__0()	Unknown
 	mscorlib.dll!System.Threading.Tasks.SynchronizationContextAwaitTaskContinuation.GetActionLogDelegate.AnonymousMethod__0()	Unknown
 	Microsoft.VisualStudio.Threading.dll!Microsoft.VisualStudio.Threading.JoinableTaskFactory.SingleExecuteProtector.TryExecute()	Unknown
 	WindowsBase.dll!System.Windows.Threading.ExceptionWrapper.InternalRealCall(System.Delegate callback, object args, int numArgs)	Unknown
 	WindowsBase.dll!System.Windows.Threading.ExceptionWrapper.TryCatchWhen(object source, System.Delegate callback, object args, int numArgs, System.Delegate catchHandler)	Unknown
 	WindowsBase.dll!System.Windows.Threading.DispatcherOperation.InvokeImpl()	Unknown
 	WindowsBase.dll!MS.Internal.CulturePreservingExecutionContext.CallbackWrapper(object obj)	Unknown
 	mscorlib.dll!System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, object state, bool preserveSyncCtx)	Unknown
 	mscorlib.dll!System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, object state, bool preserveSyncCtx)	Unknown
 	mscorlib.dll!System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, object state)	Unknown
 	WindowsBase.dll!MS.Internal.CulturePreservingExecutionContext.Run(MS.Internal.CulturePreservingExecutionContext executionContext, System.Threading.ContextCallback callback, object state)	Unknown
 	WindowsBase.dll!System.Windows.Threading.DispatcherOperation.Invoke()	Unknown
 	WindowsBase.dll!System.Windows.Threading.Dispatcher.ProcessQueue()	Unknown
 	WindowsBase.dll!System.Windows.Threading.Dispatcher.WndProcHook(System.IntPtr hwnd, int msg, System.IntPtr wParam, System.IntPtr lParam, ref bool handled)	Unknown
 	WindowsBase.dll!MS.Win32.HwndWrapper.WndProc(System.IntPtr hwnd, int msg, System.IntPtr wParam, System.IntPtr lParam, ref bool handled)	Unknown
 	WindowsBase.dll!MS.Win32.HwndSubclass.DispatcherCallbackOperation(object o)	Unknown
 	WindowsBase.dll!System.Windows.Threading.ExceptionWrapper.InternalRealCall(System.Delegate callback, object args, int numArgs)	Unknown
 	WindowsBase.dll!System.Windows.Threading.ExceptionWrapper.TryCatchWhen(object source, System.Delegate callback, object args, int numArgs, System.Delegate catchHandler)	Unknown
 	WindowsBase.dll!System.Windows.Threading.Dispatcher.LegacyInvokeImpl(System.Windows.Threading.DispatcherPriority priority, System.TimeSpan timeout, System.Delegate method, object args, int numArgs)	Unknown
 	WindowsBase.dll!MS.Win32.HwndSubclass.SubclassWndProc(System.IntPtr hwnd, int msg, System.IntPtr wParam, System.IntPtr lParam)	Unknown
 	[Async Call Stack]	
 	[Async] ICSharpCode.CodeConverter.VsExtension.dll!ICSharpCode.CodeConverter.VsExtension.CodeConversion.EnsureBuiltAsync(System.Collections.Generic.IReadOnlyCollection<EnvDTE.Project> readOnlyCollection) Line 115	C#
 	[Async] ICSharpCode.CodeConverter.VsExtension.dll!ICSharpCode.CodeConverter.VsExtension.CodeConversion.ConvertDocumentAsync<ICSharpCode.CodeConverter.CSharp.VBToCSConversion>(string documentFilePath, Microsoft.VisualStudio.Text.Span selected, System.Threading.CancellationToken cancellationToken) Line 90	C#
 	[Async] ICSharpCode.CodeConverter.VsExtension.dll!ICSharpCode.CodeConverter.VsExtension.ConvertVBToCSCommand.ConvertDocumentAsync(string documentPath, Microsoft.VisualStudio.Text.Span selected, System.Threading.CancellationToken cancellationToken) Line 183	C#
 	[Async] ICSharpCode.CodeConverter.VsExtension.dll!ICSharpCode.CodeConverter.VsExtension.ConvertVBToCSCommand.CodeEditorMenuItemCallbackAsync(System.Threading.CancellationToken cancellationToken) Line 156	C#
 	[Async] ICSharpCode.CodeConverter.VsExtension.dll!ICSharpCode.CodeConverter.VsExtension.OleMenuCommandWithBlockingStatus..ctor.__ExecuteAsync|1() Line 28	C#
 	[Async] Microsoft.VisualStudio.Threading.dll!Microsoft.VisualStudio.Threading.JoinableTask.SetWrappedTask.AnonymousMethod__91_0(System.Threading.Tasks.Task t, object s)	Unknown

[JohnRosePLI]

Thank you for your research and infos so far. From your feedback I could identify the Problem on my site. The error occurs when the chosen file has not been saved before starting the converter. So I got the solution.