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Editorial Team
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Asked: 2026-06-01T18:55:05+00:00

I’m really desperate. I have WPF MVVM app and I send and recieve some

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I’m really desperate. I have WPF MVVM app and I send and recieve some packets through USB. I use a library for that and this library needs HwndSource. Everything works fine, but now I need to send many packets and it takes some time so I decided that I use BackgroundWorker and show ProgressBar, but I don’t know how to use HwndSource in BackgroundWorker, because I got this error:

The calling thread must be STA, because many UI components require this.

Can anyone help me with this issue?
Thank you.

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1 Answer

  1. Editorial Team

    When using seperate threads they need to be in a STA (single-threaded apartment), which is not the case for background worker threads. You will probably have to create the thread yourself as stated in this answer

    Thread t = new Thread(ThreadProc); 
t.SetApartmentState(ApartmentState.STA); 
t.Start();

    with ThreadProc being a delegate of type ThreadStart.

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