I cloned the catel repo, opened Catel.sln in VS 2019, and switched to master branch. None of the projects load. In the Solution output window I'm getting messages like
\Catel.Tests.TestReferenceC\Catel.Tests.TestReferenceC.csproj : error : The expression "[System.IO.Path]::GetDirectoryName('')" cannot be evaluated. The path is not of a legal form.
for each project in the solution. The message also mentions
.nuget\packages\msbuild.sdk.extras\2.0.54\Sdk\Sdk.props
It looks like the problem is in msbuild.sdk.extras. How do I fix it?
Please check out the section in the readme about building Catel:
https://github.com/catel/catel#building-catel
MSBuild.Sdk.Extras is required as sdk for the projects (allows multi-targeting and more). The most important thing is to restore packages. Once packages (especially MSBuild.Sdk.Extras) are restored, it should work as expected.