C# prerelease version of C# extension errors with .NET 6

[johnnyreilly]

Environment data

dotnet --info output:

dotnet --info
.NET SDK (reflecting any global.json):
 Version:   6.0.408
 Commit:    0c3669d367

Runtime Environment:
 OS Name:     Mac OS X
 OS Version:  13.3
 OS Platform: Darwin
 RID:         osx.13-x64
 Base Path:   /usr/local/share/dotnet/sdk/6.0.408/

global.json file:
  Not found

Host:
  Version:      6.0.16
  Architecture: x64
  Commit:       1e620a42e7

.NET SDKs installed:
  6.0.408 [/usr/local/share/dotnet/sdk]

.NET runtimes installed:
  Microsoft.AspNetCore.App 6.0.16 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 6.0.16 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]

Download .NET:
  https://aka.ms/dotnet-download

Learn about .NET Runtimes and SDKs:
  https://aka.ms/dotnet/runtimes-sdk-info

VS Code version:

Version: 1.79.2
Commit: 695af097c7bd098fbf017ce3ac85e09bbc5dda06
Date: 2023-06-14T08:58:52.392Z (5 days ago)
Electron: 22.5.7
Chromium: 108.0.5359.215
Node.js: 16.17.1
V8: 10.8.168.25-electron.0
OS: Darwin x64 22.4.0

C# Extension version: v2.0.212

OmniSharp log

Activating C# + C# Dev Kit + C# IntelliCode...
You must install or update .NET to run this application.

App: /Users/jreilly/.vscode/extensions/ms-dotnettools.csharp-2.0.212-darwin-x64/.roslyn/Microsoft.CodeAnalysis.LanguageServer.dll
Architecture: x64
Framework: 'Microsoft.NETCore.App', version '7.0.0-preview.7.22362.8' (x64)
.NET location: /usr/local/share/dotnet/

The following frameworks were found:
  6.0.16 at [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]

Learn about framework resolution:
https://aka.ms/dotnet/app-launch-failed

To install missing framework, download:
https://aka.ms/dotnet-core-applaunch?framework=Microsoft.NETCore.App&framework_version=7.0.0-preview.7.22362.8&arch=x64&rid=osx.13-x64
[Info  - 08:15:31] Connection to server got closed. Server will restart.
[Error - 08:15:31] Server initialization failed.
  Message: Pending response rejected since connection got disposed
  Code: -32097 
[Error - 08:15:31] Microsoft.CodeAnalysis.LanguageServer client: couldn't create connection to server.
  Message: Pending response rejected since connection got disposed
  Code: -32097 
Dotnet path: /Users/jreilly/Library/Application Support/Code/User/globalStorage/ms-dotnettools.vscode-dotnet-runtime/.dotnet/7.0.7/dotnet
Activating C# + C# Dev Kit + C# IntelliCode...
You must install or update .NET to run this application.

App: /Users/jreilly/.vscode/extensions/ms-dotnettools.csharp-2.0.212-darwin-x64/.roslyn/Microsoft.CodeAnalysis.LanguageServer.dll
Architecture: x64
Framework: 'Microsoft.NETCore.App', version '7.0.0-preview.7.22362.8' (x64)
.NET location: /usr/local/share/dotnet/

The following frameworks were found:
  6.0.16 at [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]

Learn about framework resolution:
https://aka.ms/dotnet/app-launch-failed

To install missing framework, download:
https://aka.ms/dotnet-core-applaunch?framework=Microsoft.NETCore.App&framework_version=7.0.0-preview.7.22362.8&arch=x64&rid=osx.13-x64
[Info  - 08:15:31] Connection to server got closed. Server will restart.
[Error - 08:15:31] Server initialization failed.
  Message: Pending response rejected since connection got disposed
  Code: -32097 
[Error - 08:15:31] Microsoft.CodeAnalysis.LanguageServer client: couldn't create connection to server.
  Message: Pending response rejected since connection got disposed
  Code: -32097 
Dotnet path: /Users/jreilly/Library/Application Support/Code/User/globalStorage/ms-dotnettools.vscode-dotnet-runtime/.dotnet/7.0.7/dotnet
Activating C# + C# Dev Kit + C# IntelliCode...
You must install or update .NET to run this application.

App: /Users/jreilly/.vscode/extensions/ms-dotnettools.csharp-2.0.212-darwin-x64/.roslyn/Microsoft.CodeAnalysis.LanguageServer.dll
Architecture: x64
Framework: 'Microsoft.NETCore.App', version '7.0.0-preview.7.22362.8' (x64)
.NET location: /usr/local/share/dotnet/

The following frameworks were found:
  6.0.16 at [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]

Learn about framework resolution:
https://aka.ms/dotnet/app-launch-failed

To install missing framework, download:
https://aka.ms/dotnet-core-applaunch?framework=Microsoft.NETCore.App&framework_version=7.0.0-preview.7.22362.8&arch=x64&rid=osx.13-x64
[Info  - 08:15:31] Connection to server got closed. Server will restart.
[Error - 08:15:31] Server initialization failed.
  Message: Pending response rejected since connection got disposed
  Code: -32097 
[Error - 08:15:31] Microsoft.CodeAnalysis.LanguageServer client: couldn't create connection to server.
  Message: Pending response rejected since connection got disposed
  Code: -32097 
[Error - 08:15:31] Restarting server failed
  Message: Pending response rejected since connection got disposed
  Code: -32097 
Dotnet path: /Users/jreilly/Library/Application Support/Code/User/globalStorage/ms-dotnettools.vscode-dotnet-runtime/.dotnet/7.0.7/dotnet
Activating C# + C# Dev Kit + C# IntelliCode...
You must install or update .NET to run this application.

App: /Users/jreilly/.vscode/extensions/ms-dotnettools.csharp-2.0.212-darwin-x64/.roslyn/Microsoft.CodeAnalysis.LanguageServer.dll
Architecture: x64
Framework: 'Microsoft.NETCore.App', version '7.0.0-preview.7.22362.8' (x64)
.NET location: /usr/local/share/dotnet/

The following frameworks were found:
  6.0.16 at [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]

Learn about framework resolution:
https://aka.ms/dotnet/app-launch-failed

To install missing framework, download:
https://aka.ms/dotnet-core-applaunch?framework=Microsoft.NETCore.App&framework_version=7.0.0-preview.7.22362.8&arch=x64&rid=osx.13-x64
[Info  - 08:15:31] Connection to server got closed. Server will restart.
[Error - 08:15:31] Server initialization failed.
  Message: Pending response rejected since connection got disposed
  Code: -32097 
[Error - 08:15:31] Microsoft.CodeAnalysis.LanguageServer client: couldn't create connection to server.
  Message: Pending response rejected since connection got disposed
  Code: -32097 
[Error - 08:15:31] Restarting server failed
  Message: Pending response rejected since connection got disposed
  Code: -32097 
Dotnet path: /Users/jreilly/Library/Application Support/Code/User/globalStorage/ms-dotnettools.vscode-dotnet-runtime/.dotnet/7.0.7/dotnet
Activating C# + C# Dev Kit + C# IntelliCode...
You must install or update .NET to run this application.

App: /Users/jreilly/.vscode/extensions/ms-dotnettools.csharp-2.0.212-darwin-x64/.roslyn/Microsoft.CodeAnalysis.LanguageServer.dll
Architecture: x64
Framework: 'Microsoft.NETCore.App', version '7.0.0-preview.7.22362.8' (x64)
.NET location: /usr/local/share/dotnet/

The following frameworks were found:
  6.0.16 at [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]

Learn about framework resolution:
https://aka.ms/dotnet/app-launch-failed

To install missing framework, download:
https://aka.ms/dotnet-core-applaunch?framework=Microsoft.NETCore.App&framework_version=7.0.0-preview.7.22362.8&arch=x64&rid=osx.13-x64
[Error - 08:15:31] The Microsoft.CodeAnalysis.LanguageServer server crashed 5 times in the last 3 minutes. The server will not be restarted. See the output for more information.
[Error - 08:15:31] Server initialization failed.
  Message: Pending response rejected since connection got disposed
  Code: -32097 
[Error - 08:15:31] Microsoft.CodeAnalysis.LanguageServer client: couldn't create connection to server.
  Message: Pending response rejected since connection got disposed
  Code: -32097 
[Error - 08:15:31] Restarting server failed
  Message: Pending response rejected since connection got disposed
  Code: -32097 

Steps to reproduce

1. Install the C# plugin with .NET 6 installed locally
2. See errors

Expected behavior

C# plugin works.

Actual behavior

C# plugin doesn't work.

Additional context

Add any other context about the problem here.

[dibarbet]

Currently the server requires the .NET 7 runtime to start, however it should be acquiring it on startup using the vscode dotnet runtime acquisition extension.

Have you by chance changed this setting? - dotnetAcquisitionExtension.existingDotnetPath

cc @genlu

[johnnyreilly]

I have not changed that setting.

[dibarbet]

I think this should fix the issue - #5838

This won't be shipping until next week, but if you'd like to test it out and confirm if it fixes your issue, the darwin-x64 vsix with the change is available here - https://artprodcus3.artifacts.visualstudio.com/A6fcc92e5-73a7-4f88-8d13-d9045b45fb27/cbb18261-c48f-4abb-8651-8cdcb5474649/_apis/artifact/cGlwZWxpbmVhcnRpZmFjdDovL2RuY2VuZy1wdWJsaWMvcHJvamVjdElkL2NiYjE4MjYxLWM0OGYtNGFiYi04NjUxLThjZGNiNTQ3NDY0OS9idWlsZElkLzMxNDQ5OS9hcnRpZmFjdE5hbWUvVlNJWHMrLStBdHRlbXB0KzE1/content?format=file&subPath=%2Fcsharp-darwin-x64-2.0.239-g4f15821649.vsix

(From this pipeline build - https://dev.azure.com/dnceng-public/public/_build/results?buildId=314499&view=artifacts&pathAsName=false&type=publishedArtifacts)