How to load the projects having .slnx using MSBuildWorkspace

[RishadOR]

• I can load a solution .sln using MSBuildWorkspace.OpenSolutionAsync
• I can load a project .csproj using MSBuildWorkspace.OpenProjectAsync
• But get error when i try to load a .slnx solution using MSBuildWorkspace.OpenSolutionAsync

For example:
https://github.com/dotnet/orleans/blob/main/Orleans.slnx

[jasonmalinowski]

@RishadOR What version of Microsoft.CodeAnalysis.Workspaces.MSBuild are you using? 4.14 should work. If not, share the error you're getting.

[RishadOR]

<PackageReference Include="Microsoft.CodeAnalysis.Workspaces.MSBuild" Version="4.14.0" />

I am getting the following error

Unhandled exception. Microsoft.Build.Exceptions.InvalidProjectFileException: No file format header found.  /home/rishad/OrHome/csharp/projects/orleans/Orleans.slnx
   at Microsoft.Build.Shared.ProjectFileErrorUtilities.VerifyThrowInvalidProjectFile(Boolean condition, String errorSubCategoryResourceName, BuildEventFileInfo projectFile, Exception innerException, String resourceName, Object[] args)
   at Microsoft.Build.Shared.ProjectFileErrorUtilities.VerifyThrowInvalidProjectFile(Boolean condition, String errorSubCategoryResourceName, BuildEventFileInfo projectFile, String resourceName, Object[] args)
   at Microsoft.Build.Construction.SolutionFile.ParseFileHeader()
   at Microsoft.Build.Construction.SolutionFile.ParseSolution()
   at Microsoft.Build.Construction.SolutionFile.ParseSolutionFile()
   at Microsoft.Build.Construction.SolutionFile.Parse(String solutionFile)
   at Microsoft.CodeAnalysis.MSBuild.MSBuildProjectLoader.LoadSolutionInfoAsync(String solutionFilePath, IProgress`1 progress, ILogger msbuildLogger, CancellationToken cancellationToken)
   at Microsoft.CodeAnalysis.MSBuild.MSBuildWorkspace.OpenSolutionAsync(String solutionFilePath, ILogger msbuildLogger, IProgress`1 progress, CancellationToken cancellationToken)

[jasonmalinowski]

Ah my apologies: looks like #77326 got merged after that cutoff and would be in the 5.0 packages. We should get 5.0 packages out with some preview so you don't have to wait for GA.