C# 1.25.0 causing code editing issues

[rkb-ravi]

Finally found the solution.
Downgrading C# extension to 1.24.4 worked.
Its a problem with C# 1.25.0 update that caused problems with outlines; which also caused problem with C# editing support, including Syntax Highlighting, IntelliSense, Go to Definition, Find All References, etc. Downgrading to previous version, solved these issues :)

Originally posted by @rkb-ravi in microsoft/vscode#150406 (comment)

[2151891911]

The solution that actually works with no downgrade is a workaround. Install Visual Studio Build Tools 2022 ( and choose the specific MSBuild instances that you need.

Of course, setting the setting into false ("omnisharp.useModernNet" : false) will not bring an MSBuild into your computer.

[gfigueras-sage]

Having the same issue. Also, tests can't be run or debugged individually.

[filipw]

Please see the announcement https://github.com/OmniSharp/omnisharp-vscode#the-c-extension-no-longer-ships-with-an-included-mono--msbuild-tools

and the related issue #5120

TL;DR

• ensure .NET SDK 6 is installed
• for .NET Core (and newer) development this should be enough
• for Unity / .NET Framework development, set "omnisharp.useModernNet" : false and ensure global MSBuild is installed on your machine - either using VS 2022 Build Tools (Windows) or using latest Mono Preview (*nix)

[mzvast]

Having the same issue. Downgrade to 1.24.4 worked

[itatharopanthayanantham]

Using 2.0.376, recently updated. Having the same issue.