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Editorial Team
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Asked: 2026-05-27T01:48:40+00:00

I am starting a new UI-Thread in my WPF-application. Now I am searching a

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I am starting a new UI-Thread in my WPF-application. Now I am searching a way to get a list with all windows in this thread – like I will get it for the main-thread with System.Windows.Application.Current.Windows.
Is there something in the .NET-Framework or does I have to implement it myself? When I have to implement it myself, perhaps someone have little bit of sample-code?

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  1. Editorial Team

    To quote MSDN:

    A Window reference is automatically added to Windows as soon as a window is instantiated on the user interface (UI) thread; windows that are created by worker threads are not added. A Window reference is automatically removed after its Closing event has been handled and before its Closed event is raised.

    By default, the first item added to the Windows property becomes the MainWindow.

    This property is available only from the thread that created the Application object.

    So it seems the windows created by worker threads are not hold in any collection automatically. I assume you create that window on the worker thread – so you should store a reference to it yourself for later access (you could do that in the Windows constructor by adding this to some window manager class)

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