Removes the specified routed event handler from this UIElement.
Assembly: System.Windows (in System.Windows.dll)
routedEvent or handler is nullNothingnullptrunita null reference (Nothing in Visual Basic).
routedEvent does not represent a supported routed event.
handler does not implement a supported delegate.
Attempted to remove handler for an event not supported by the current platform variation.
can only be used for the event handlers of the events that are supported by AddHandler. You cannot use to remove handlers for general events that are added with the language-specific event wiring syntax (such as += in C#) or with event attribute in XAML. You should instead use language-specific event handler disconnection / removal syntax (such as -= in C#) for such event handlers.
Calling this method has no effect if there were no handlers registered with criteria that match the input parameters for the method call.
If more than one handler is attached that matched the criteria, only the first handler in the event handler store is removed. This behavior is consistent with CLR behavior of the -= operator.
Neither routedEvent nor handler may be nullNothingnullptrunita null reference (Nothing in Visual Basic). Attempting to provide either value as nullNothingnullptrunita null reference (Nothing in Visual Basic) will raise an exception.
This method ignores the handledEventsToo parameter information of the symmetric AddHandler call.
Silverlight 3: Not all events noted in Remarks above are available in Silverlight 3. Silverlight 3 does not support right-click events, manipulation/touch events, drag/drop events, or IME support events. Attempting to add or remove handlers for these in Silverlight 3 throws an ArgumentException.
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.