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Visual Studio Code Generator Hanging

Thomas Hammond 1 Reputation point
2025-12-10T19:17:36.9+00:00

I implemented a Visual Studio code generator that uses the Microsoft.VisualStudio.TextTemplating.VSHost.BaseCodeGeneratorWithSite in the Visual Studio SDK. When running in Visual Studio 2026, the following code hangs:
var p = GetService(typeof(SVSMDCodeDomProvider));

I tried switching to using a GUID instead of the type, but same result.

Is there something special I have to do in VS2026 to get this to work?

Thanks.

Developer technologies | Visual Studio | Extensions
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  1. Surya Amrutha Vaishnavi Lanka (INFOSYS LIMITED) 1,205 Reputation points Microsoft External Staff
    2025-12-11T12:15:51.72+00:00

    Thanks for sharing the details

    The hang occurs because Visual Studio 2022 no longer supports retrieving IVsMDCodeDomProvider through synchronous GetService. This service must be loaded via the async service provider. Please replace your service lookup with:

    var asyncServiceProvider = (IAsyncServiceProvider)Package.GetGlobalService(typeof(SAsyncServiceProvider));

    var codeDomProvider = await asyncServiceProvider

        .GetServiceAsync(typeof(SVsMDCodeDomProvider)) 

        as IVsMDCodeDomProvider;

    If your generator does not support async execution, preload this service in your package’s async initialization and use the cached instance. Synchronous service calls will hang in VS2022, which is the behavior you are seeing.

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