Application.Idle event not firing in WPF application

I am using a third-party Windows Forms control that performs some actions "delayed"开发者_运维知识库 using the Application.Idle event.

Now that we're moving our application to WPF, these actions stopped working. I've found that the System.Windows.Forms.Application.Idle event is not raised as expected.

How can I get the Idle event to fire in a WPF application so that I can continue to use that third-party control (within a WindowsFormsHost)? It is not possible to modify the Windows Forms control.

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You should read this page on MSDN which describes the message loop behavior in a WPF application. In particular it looks like the ComponentDispatcher class can be used to catch a ThreadIdle event which would roughly correspond to the Windows Forms Application.Idle event.

You could then presumably use the System.Windows.Forms.Application.RaiseIdle method to raise the Idle event as the component expects.

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If you are using a WPF Application, you are actually no longer using the System.Windows.Forms.Application class to run your application, even if your application contains a Windows Forms Control.

Instead, you are using the System.Windows.Application class (different namespace).