RoutedEventArgs.Source vs Sender

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The difference between the two is not often seen, as usually the sender and Source are the same. Most code written like Windows Forms will basically ignore the difference and send them along as the same reference. However, given how WPF’s event routing works they represent two different concepts.

sender is the object at which the event handler was attached. This is the owner that raised the handler to begin routing the event. From MSDN:

A difference between sender and Source is the result of the event being routed to different elements, during the traversal of the routed event through an element tree.

MSDN: Event routing diagram

Source is the object where the event originates. In the case of tunneling and bubbling, the Source will be one of their child elements. You can use the OriginalSource property to peel back any event tree encapsulation.

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