Create workspace from MSBuild project

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First obtain the Microsoft.CodeAnalysis.CSharp.Workspaces nuget before continuing.

var workspace = Microsoft.CodeAnalysis.MSBuild.MSBuildWorkspace.Create();
var project = await workspace.OpenProjectAsync(projectFilePath);
var compilation = await project.GetCompilationAsync();

foreach (var diagnostic in compilation.GetDiagnostics()
    .Where(d => d.Severity == Microsoft.CodeAnalysis.DiagnosticSeverity.Error))

To load existing code to the workspace, compile and report errors. Afterwards the code will be located in memory. From here, both the syntactic and semantic side will be available to work with.

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