Crashing while editing razor files

Environment data

dotnet SDK version: 3.0.100-preview6-012264 VS Code version: 1.35.1 C# Extension version: 1.20.0

Steps to reproduce

Edit razor files of a blazor client app. it sometimes crash.

Expected behavior

Nothing happen

Actual behavior

[Error - 5:01:26 PM] Request textDocument/completion failed.
  Message: Internal Error - System.AggregateException: One or more errors occurred. (Exception of type 'OmniSharp.Extensions.JsonRpc.Server.JsonRpcException' was thrown.) ---> OmniSharp.Extensions.JsonRpc.Server.JsonRpcException: Exception of type 'OmniSharp.Extensions.JsonRpc.Server.JsonRpcException' was thrown.
   at OmniSharp.Extensions.JsonRpc.ResponseRouter.SendRequest[T,TResponse](String method, T params)
   at Microsoft.AspNetCore.Razor.LanguageServer.DefaultRemoteTextLoaderFactory.RemoteTextLoader.LoadTextAndVersionAsync(Workspace workspace, DocumentId documentId, CancellationToken cancellationToken) in /_/src/Microsoft.AspNetCore.Razor.LanguageServer/DefaultRemoteTextLoaderFactory.cs:line 73
   at Microsoft.CodeAnalysis.Razor.ProjectSystem.DocumentState.GetTextAsync()
   at Microsoft.CodeAnalysis.Razor.ProjectSystem.DefaultProjectSnapshotManager.<>c__DisplayClass19_0.<<DocumentOpened>b__0>d.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at Microsoft.CodeAnalysis.Razor.ProjectSystem.DocumentState.GetTextAsync()
   at Microsoft.AspNetCore.Razor.LanguageServer.RazorDocumentSynchronizationEndpoint.Handle(DidChangeTextDocumentParams notification, CancellationToken token) in /_/src/Microsoft.AspNetCore.Razor.LanguageServer/RazorDocumentSynchronizationEndpoint.cs:line 79
   at OmniSharp.Extensions.LanguageServer.Server.Pipelines.ResolveCommandPipeline`2.Handle(TRequest request, CancellationToken cancellationToken, RequestHandlerDelegate`1 next)
   at OmniSharp.Extensions.LanguageServer.Server.LspRequestRouter.RouteNotification(IHandlerDescriptor descriptor, Notification notification)
   --- End of inner exception stack trace ---
   at System.Threading.Tasks.Task`1.GetResultCore(Boolean waitCompletionNotification)
   at Microsoft.CodeAnalysis.Razor.ProjectSystem.DocumentState.TryGetTextVersion(VersionStamp& result)
   at Microsoft.CodeAnalysis.Razor.ProjectSystem.DocumentState.GetTextVersionAsync()
   at Microsoft.CodeAnalysis.Razor.ProjectSystem.DocumentState.ComputedStateTracker.GetGeneratedOutputAndVersionCoreAsync(DefaultProjectSnapshot project, DocumentSnapshot document)
   at Microsoft.CodeAnalysis.Razor.ProjectSystem.DefaultDocumentSnapshot.GetGeneratedOutputAsync()
   at Microsoft.AspNetCore.Razor.LanguageServer.Completion.RazorCompletionEndpoint.Handle(CompletionParams request, CancellationToken cancellationToken) in /_/src/Microsoft.AspNetCore.Razor.LanguageServer/Completion/RazorCompletionEndpoint.cs:line 100
   at OmniSharp.Extensions.LanguageServer.Server.Pipelines.ResolveCommandPipeline`2.Handle(TRequest request, CancellationToken cancellationToken, RequestHandlerDelegate`1 next)
   at OmniSharp.Extensions.LanguageServer.Server.LspRequestRouter.RouteRequest(IHandlerDescriptor descriptor, Request request)
---> (Inner Exception #0) OmniSharp.Extensions.JsonRpc.Server.JsonRpcException: Exception of type 'OmniSharp.Extensions.JsonRpc.Server.JsonRpcException' was thrown.
   at OmniSharp.Extensions.JsonRpc.ResponseRouter.SendRequest[T,TResponse](String method, T params)
   at Microsoft.AspNetCore.Razor.LanguageServer.DefaultRemoteTextLoaderFactory.RemoteTextLoader.LoadTextAndVersionAsync(Workspace workspace, DocumentId documentId, CancellationToken cancellationToken) in /_/src/Microsoft.AspNetCore.Razor.LanguageServer/DefaultRemoteTextLoaderFactory.cs:line 73
   at Microsoft.CodeAnalysis.Razor.ProjectSystem.DocumentState.GetTextAsync()
   at Microsoft.CodeAnalysis.Razor.ProjectSystem.DefaultProjectSnapshotManager.<>c__DisplayClass19_0.<<DocumentOpened>b__0>d.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at Microsoft.CodeAnalysis.Razor.ProjectSystem.DocumentState.GetTextAsync()
   at Microsoft.AspNetCore.Razor.LanguageServer.RazorDocumentSynchronizationEndpoint.Handle(DidChangeTextDocumentParams notification, CancellationToken token) in /_/src/Microsoft.AspNetCore.Razor.LanguageServer/RazorDocumentSynchronizationEndpoint.cs:line 79
   at OmniSharp.Extensions.LanguageServer.Server.Pipelines.ResolveCommandPipeline`2.Handle(TRequest request, CancellationToken cancellationToken, RequestHandlerDelegate`1 next)
   at OmniSharp.Extensions.LanguageServer.Server.LspRequestRouter.RouteNotification(IHandlerDescriptor descriptor, Notification notification)<---

  Code: -32602 

[nkev]

I’ve posted a bit more info at aspnet/Razor.VSCode#372

[NTaylorMullen]

Ahh, that helps a lot thanks for investigating further! We’re tracking the fix for this issue over here: https://github.com/aspnet/Razor.VSCode/issues/372