1.

Explain Routed Events in WPF.

Answer»

Routed events are those that follow a specific routing strategy in order to move up or down the visual tree. Event handlers can be hooked up to the element that triggers the event or to multiple elements above and below it.


There are three main routing strategies for RoutedEvents, which are as follows:

  • Direct Event: An event triggered by a source element that MUST be handled by the source element itself. Direct events behave similarly to normal .NET events.
  • Bubbling Event: A bubble event begins with the element from where it was raised. AFTERWARDS, it navigates up to the top element (root) of the visual tree or until the event bubbles are stopped by marking it as handled. Typically, the top (root) element of WPF is a window.
  • Tunnel Event: The root element raises this event. Following that, it navigates down the visual tree to REACH the source element of the visual tree or until the TUNNELLING event is terminated by marking it as handled.


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