CanExecuteChangedEventManager.Purge Method (Object, Object, Boolean)
Removes inactive listener entries from the data list for the provided source.
Assembly: PresentationCore (in PresentationCore.dll)
The source for events being listened to.
The data to check. This object is expected to be a WeakEventManager.ListenerList implementation.
true to stop listening to source, and completely remove all entries from data.
Return ValueType: System.Boolean
true if some entries were actually removed; otherwise, false.
Available since 4.5