AddHandler throws Platform::InvalidArgumentException

Question

Hi,

 I have a Grid^ myGrid in  XAML and I am trying to attach an event handler for the PointerPressed by using AddHandler function as seen below:

myGrid->AddHandler(UIElement::PointerPressedEvent, ref new PointerEventHandler([](Object^ sender, PointerRoutedEventArgs^ e)
	{
		e->Handled = true;
	}), true);

This will throw Platform::InvalidArgumentException. Could anyone shed some light on this?

Thanks,

 Stefan

Answer 1

Hi Stefan,

Where do you call this? Where exactly do you see the exception? Can you provide exact repro steps? Are you using Windows 8 RTM or a pre-release version?

I created a new Blank App, added x:Name="myGrid" to the root Grid, and copied your code snipped to MainPage::OnNavigatedTo(). Everything worked as expected: the handler was called when I touched the screen and no exception was thrown.

--Rob

Answer 2

Hi Rob,

 I am using the Release Preview version of windows 8 and VS 2012 RC. Just like you I have created a blank app and added the code in navigatedto(). 

Stefan

Answer 3

Hi Stefan,

I'd recommend upgrading to the RTM versions. From what you describe there may have been a problem with this in the previews.

--Rob