Roslyn, MSBuildWorkspace compiling a .NetStandard project referencing a .NetStandard project throws “No value for RuntimeMetadataVersion found.”

Question

Create a solution with the following projects.

A .NetStandard2.0 project, name it \"1\"

A .NetStandard2.0 project, name it \"2\"

Add a reference of p

Answer 1

To address this, here are the steps you need to take:

1. Reference the Microsoft.Build.Locator NuGet package.
2. Call MSBuildLocator.RegisterDefaults(); before creating the MSBuildWorkspace
3. Make sure that there aren't any Microsoft.Build.* assemblies in your app bin folder (see below).

With those steps I was able to correctly build the 2 projects.

This is how you can remove the files from the output folder (add this to your .csproj or use the Post Build steps in Visual Studio).

  
    del "$(TargetDir)\Microsoft.Build.dll"
del "$(TargetDir)\Microsoft.Build.Framework.dll"
del "$(TargetDir)\Microsoft.Build.Tasks.Core.dll"
del "$(TargetDir)\Microsoft.Build.Utilities.Core.dll"
    
  

For additional information please see: https://github.com/dotnet/roslyn/issues/26029