How can I make a background worker thread set to Single Thread Apartment?

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This is not possible, BGW uses a threadpool thread. TP threads are always MTA, it cannot be changed. You will have to use a regular Thread, call SetApartmentState() before you start it. This thread also should pump a message loop, call Application.Run().

Maybe you ought to consider calling this code from the UI thread. Because in all likelihood, the COM server is running its methods on the UI thread anyway. Marshaling calls from a worker thread to the STA thread that created the COM server is automatic, COM takes care of it.

Or take the bull by the horns and marshal yourself. You can create your own STA thread to give the server a happy home. You’ll find code in this post, be sure to create the COM object in your Initialize() override.

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