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Editorial Team
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Asked: 2026-05-21T05:14:29+00:00

I have a WPF app that uses a non-WPF vendor library. My app does

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I have a WPF app that uses a non-WPF vendor library. My app does not receive any events that the library fires. I’ve been told that this is because I need a message pump.

In another (very similar) question, the accepted answer suggested using System.Windows.Threading.Dispatcher.Run().

When I add in that call, however, my window won’t pop up– the app is effectively backgrounded and I have to shut it down with Task Manager.

I’m really stumped here, and I’m not even sure how to investigate it. Any help would be greatly appreciated.

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1 Answer

  1. Editorial Team

    You already have one if you use WPF, there’s no other way that it can get any Windows notifications. Every WPF app starts life with a call to Application.Run() on the main thread. It is usually well hidden, auto-generated in the bin\debug\app.g.cs source code file. Application.Run() in turn calls Dispatcher.Run()

    Your vendor is correct, without a message loop many COM components go catatonic. But since you have one you need to look for the problem elsewhere. Don’t use the component on threads.

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