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Editorial Team
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Asked: 2026-05-11T19:32:46+00:00

My application generally running on 10-20 threads and these threads sending events to the

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My application generally running on 10-20 threads and these threads sending events to the GUI to the update certain controls almost every seconds.

When the user close the application middle of these, all updates related with these events causes several random crashes. Mostly ObjectDisposedException and NullReferenceException.

Since the events already thrown but not handled yet by the .NET Framework, they are not in a state where I can cancel them.

I’m not quite sure about the best way to handle this. Currently I’m just swallowing exceptions the exceptions.

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1 Answer

  1. Editorial Team

    A few options:

    • when the app starts closing (FormClosing?), you could start cleanly exiting the threads (via a flag somewhere)
    • presumably to talk to your UI, you are raising events that are handled by the UI (which handles synchronization etc) – keep a flag, and (if it is safe to do do) simply drop events if the flag has been set (again, because you are exiting)
    • when exiting, have the UI unsubscribe from events
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