Assembly: WindowsBase (in WindowsBase.dll)
A handler can mark the exception as handled, which will prevent the internal exception handler from being called.
Event handlers for this event must be written with care to avoid creating secondary exceptions and to catch any that occur. It is recommended to avoid allocating memory or doing any resource intensive operations in the handler.
The UnhandledExceptionFilter event provides a means to not raise the event. The UnhandledExceptionFilter event is raised first, and If RequestCatch on the DispatcherUnhandledExceptionFilterEventArgs is set to false, the event will not be raised.