On Key Down(KeyRoutedEventArgs) Method
protected: virtual void OnKeyDown(KeyRoutedEventArgs ^ e) = OnKeyDown;
virtual void OnKeyDown(KeyRoutedEventArgs const & e);
protected virtual void OnKeyDown(KeyRoutedEventArgs e);
Protected Overridable Sub OnKeyDown (e As KeyRoutedEventArgs)
The data for the event.
As it's implemented directly on Control, OnKeyDown has an empty implementation. But each ancestor in a control's hierarchy may have provided an implementation. You won't be able to see this implementation because it's internal native code. In some cases a control will already have existing OnEvent overrides that mark the event Handled. For key events, controls are usually only handling for certain keys, by checking values in KeyRoutedEventArgs. For example, ButtonBase detects the Space key as a way to fire Click. Control code or your code probably shouldn't be suppressing all key events, because it's a common pattern to let key events bubble to the root visual so that they can be shortcuts or accelerators for app interaction. For more info see Keyboard interactions.