How to call DispatchedHandler::Invoke()?

Question

Its protected I know, but somehow the CoreDispatcher is able to call it in its runAsync method. How does it do that?

Answer 1

Hi,

You can follow these codes

		Windows::UI::Core::CoreDispatcher ^dispatcher = CoreWindow::GetForCurrentThread() -> Dispatcher;
		dispatcher -> RunAsync(Windows::UI::Core::CoreDispatcherPriority::Normal,
			ref new Windows::UI::Core::DispatchedHandler(
			[]{
			// change something in UI					);
			}));

Best regards,
Jesse

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Jesse Jiang
MSDN Community Support | Feedback to us
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Answer 2

Thanks Jesse for your answer. Thats not what I was asking though. I know how to use DispatchedHandler with the CoreDispatcher.

I was interested in the internals of how it calls the DispatchedHandler::Invoke method because the crazy IntelliSense underlined my code when I wanted to call Invoke myself complaining that the call is protected. I needed that because in background tasks I do not have a CoreDispatcher available. However, the compiler did not complain (makes you wonder why IntelliSense uses a different set of rules than the compiler) but the app terminated when I called Invoke().

Doesn't matter now anymore though, since I found out that just calling callbacks without DispatchedHandler works very well in background task scenarios.