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Home/ Questions/Q 250095
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Editorial Team
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Editorial Team
Asked: May 11, 20262026-05-11T21:28:56+00:00 2026-05-11T21:28:56+00:00

We have some C# code that uses COM (its calling legacy code). When an

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We have some C# code that uses COM (its calling legacy code).

When an event happens, a COM event is fired.

Everything works perfectly.

However, if we call that same code from within a unit test, then suddenly the COM events cease to be fired – its just silence, like some sort of empty room with no party.

Any ideas why?

Environment:

  • Microsoft Visual Studio 2008.
  • Unit testing using the built in unit testing for MSVS 2008
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  1. Editorial Team
    Editorial Team
    2026-05-11T21:28:57+00:00Added an answer on May 11, 2026 at 9:28 pm

    Without further details, this is hard to diagnose. However, it is possible that this is actually an apartment issue: IIRC, VS runs tests in an STA. If your application uses an MTA to run the same code, it could be that you are facing deadlocking or similar issues.

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