Cannot open multiple Unity projects at the same time

[sbfkcel]

Issue Description

Unity project, cannot open multiple projects

Steps to Reproduce

• According to the official guidance of vscode（https://code.visualstudio.com/docs/other/unity）
• Open a project with vscode
• Close vscode (note: not exit)
• Double-click the c# file in the Unity project again
• It will prompt: OmniSharp requires a complete install of Mono (including MSBuild) to provide language services when omnisharp.useModernNet is disabled in Settings. Please install the latest Mono and restart.

Expected Behavior

No prompts will pop up, and everything is fine.

Actual Behavior

A prompt window pops up and the language server is unavailable

Logs

OmniSharp log

Post the output from Output-->OmniSharp log here

C# log

Post the output from Output-->C# here

Environment information

VSCode version: 1.74.2
C# Extension: 1.25.2

Mono Information

There is a problem with running OmniSharp on mono: Error: Unable to find Mono. Ensure that Mono's '/bin' folder is added to your environment's PATH variable.

Dotnet Information

Command failed: dotnet --version /bin/sh: dotnet: command not found

Visual Studio Code Extensions

Extension	Author	Version
beautify	HookyQR	1.5.0
better-comments	aaron-bond	3.0.2
comment-translate	intellsmi	2.2.4
csharp	ms-dotnettools	1.25.2
eslint-rules-zh-plugin	maggie	0.2.1
file-path-bar	wraith13	2.1.7
git-graph	mhutchie	1.30.0
markdown-mermaid	bierner	1.17.3
material-icon-theme	PKief	4.23.1
material-theme	zhuangtongfa	3.15.6
mermaid-markdown-syntax-highlighting	bpruitt-goddard	1.5.0
path-intellisense	christian-kohler	2.8.4
remote-explorer	ms-vscode	0.0.3
remote-ssh	ms-vscode-remote	0.94.0
remote-ssh-edit	ms-vscode-remote	0.84.0
rust-analyzer	rust-lang	0.3.1348
simple-react-snippets	burkeholland	1.2.7
unity-debug	deitry	3.0.11
vscode-deno	denoland	3.15.0
vscode-docker	ms-azuretools	1.23.3
vscode-drawio	hediet	1.6.4
vscode-eslint	dbaeumer	2.2.6
vscode-gutter-preview	kisstkondoros	0.30.0
vscode-jest	Orta	5.1.0
vscode-language-pack-zh-hans	MS-CEINTL	1.74.12140931
vscode-markdown-paste-image	telesoho	0.19.4
vscode-vlang	vlanguage	0.1.14

[sbfkcel]

The problem is the same as here

#5454 (comment)

[doseonfairsutdios]

Same issue in C# Extension 1.25.4 version

[heshuimu]

Bump, still not fixed in 1.25.4.

[doseonfairsutdios]

Bump, still not fixed in 1.25.5.

[alakoring]

I think I am seeing the same issue — I want to use VS Code with Unity. If I launch VS Code 1.77.1 from Unity, I get the message. If I launch it from Terminal, it works. (C# extension is 1.25.4.)

[stanroy]

Same for me, if I open VSCode through the dock and open Unity project from there it works fine, opening it by double clicking in Unity results in the mono install popup.

[epurban]

Same

[doseonfairsutdios]

The latest version( v2.0.248 ) c# extension does not show a pop-up, but when you open multiple projects with vscode through Unity, IntelliSense does not work properly in the second vscode.

As @stanroy said, it works fine when you open it in vscode, not in Unity with The latest version( v2.0.248 ) c# extension.

Same for me, if I open VSCode through the dock and open Unity project from there it works fine, opening it by double clicking in Unity results in the mono install popup.

It is quite inconvenient to open a Unity project with vscode instead of opening a project in Unity.

[JoeRobich]

A lot has changed with O# and mono since this issue was opened. If you are still having problems, please open a new issue at https://github.com/omnisharp/omnisharp-roslyn/issues. It is recommended to use the Unity extension for VS Code.