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Avoid BuildHost crash in Mono due to missing types #74392

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11 changes: 10 additions & 1 deletion src/Workspaces/Core/MSBuild.BuildHost/BuildHost.cs
Original file line number Diff line number Diff line change
Expand Up @@ -161,9 +161,18 @@ private void EnsureMSBuildLoaded(string projectFilePath)
/// <summary>
/// Returns the target ID of the <see cref="ProjectFile"/> object created for this.
/// </summary>
public async Task<int> LoadProjectFileAsync(string projectFilePath, string languageName, CancellationToken cancellationToken)
public Task<int> LoadProjectFileAsync(string projectFilePath, string languageName, CancellationToken cancellationToken)
{
EnsureMSBuildLoaded(projectFilePath);
return LoadProjectFileCoreAsync(projectFilePath, languageName, cancellationToken);
}

// When using the Mono runtime, the MSBuild types used in this method must be available
// to the JIT during compilation of the method, so they have to be loaded by the caller;
// therefore this method must not be inlined.
[MethodImpl(MethodImplOptions.NoInlining)]
private async Task<int> LoadProjectFileCoreAsync(string projectFilePath, string languageName, CancellationToken cancellationToken)
{
CreateBuildManager();

ProjectFileLoader projectLoader = languageName switch
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