Microsoft.Net.Compilers is only supported on MSBuild v16.3 and above

Question

I encounered this problem when I've open one of my projects for the first time on Visual Studio 2019. This was a project that I've created about three years ago and demand me just a few changes a year.

The first time I've tried to compile this project on Visual Studio 2019 I received an error related to csc.exe file, and as I've had been this error before, I've reinstaled compilers componente at Nuget Package Manager, as I did in previous times successfully.

After that, I got the error "Microsoft.Net.Compilers is only supported on MSBuild v16.3 and above".

I found out some solutions on Microsoft Developer Community recommending to open and edit the file: "packages\Microsoft.Net.Compilers.3.4.0\build\Microsoft.Net.Compilers.props", but it seens like wierd to me.

Answer 1

EDIT: As this new answer to another question states it is unlikely that Microsoft.Net.Compilers is necessary to have in your project. Read through that answer to make sure you actually need it at all. If you don't, removing Microsoft.Net.Compilers should resolve your issue. If you still need its limited functionality or if you have a problem after uninstalling it, read on for the original answer:

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I had this problem after upgrading to .NET framework 4.7.2, and could not upgrade to the suggested beta of Microsoft.Net.Compilers as it didn't seem to be available.

It should be noted that Microsoft.Net.Compilers has been deprecated and migrating to Microsoft.Net.Compilers.Toolset is recommended.

To migrate, you can simply use Nuget to uninstall Microsoft.Net.Compilers and install Microsoft.Net.Compilers.Toolset.

The version number for both was the same for me, but this fixed the problem for me and I was able to build.

Answer 2

Upgrade nuget package Microsoft.Net.Compilers to version 3.5.0-beta2-final and it should work.