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Editorial Team
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Asked: 2026-06-03T10:16:09+00:00

I am using VisualStudio 11 beta for windows 8 metro apps development, I have

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I am using VisualStudio 11 beta for windows 8 metro apps development, I have a error.
Error is:

Cannot implicitly convert type 
   'System.EventHandler<Windows.UI.Input.ManipulationStartedEventArgs>' to 
   'Windows.UI.Xaml.Input.ManipulationStartedEventHandler'

and my code is.

selectRectangle.ManipulationStarted += new EventHandler<ManipulationStartedEventArgs>(OnRectangleManipulationStarted);
ellipseTL.ManipulationStarted += new EventHandler<ManipulationStartedEventArgs>(OnRectangleManipulationStarted);
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1 Answer

  1. Editorial Team

    I haven’t worked with VS 2012 for Metro yet, but from what I understand, Metro/.NET 4.5 does a bit of reorganization of namespaces, or at least the selectRectangle/ellipseTL.ManipulationStarted events use a different class. Certainly in this case, they’re looking for a ManipulationStartedEventHandler not an EventHandler<>.

    Try this instead:

    selectRectangle.ManipulationStarted += new Windows.UI.Xaml.Input.ManipulationStartedEventHandler(OnRectangleManipulationStarted);
ellipseTL.ManipulationStarted += new Windows.UI.Xaml.Input.ManipulationStartedEventHandler(OnRectangleManipulationStarted);

    Or use the implicit event handler syntax:

    selectRectangle.ManipulationStarted += OnRectangleManipulationStarted;
ellipseTL.ManipulationStarted += OnRectangleManipulationStarted;

    But like I said, I haven’t worked with the new API yet, so this is just a best guess from my experience with 4.0.

    EDIT: You might also need to change the signature of your OnRectangleManipulationStarted method to match the ManipulationStartedEventHandler signature.

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