WeakEventManager.Purge(Object, Object, Boolean) Method

Reference

Definition

Namespace:: System.Windows

Assembly:: WindowsBase.dll

Important

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Removes inactive listener entries from the data list for the provided source. Returns true if some entries were actually removed from the list.

protected:
 virtual bool Purge(System::Object ^ source, System::Object ^ data, bool purgeAll);

protected virtual bool Purge (object source, object data, bool purgeAll);

abstract member Purge : obj * obj * bool -> bool
override this.Purge : obj * obj * bool -> bool

Protected Overridable Function Purge (source As Object, data As Object, purgeAll As Boolean) As Boolean

Parameters

source: Object

The source for events being listened to.

data: Object

The data to check. This object is expected to be a WeakEventManager.ListenerList implementation.

purgeAll: Boolean

true to stop listening to source, and completely remove all entries from data.

Returns

Boolean

true if some entries were actually removed; otherwise, false.

Remarks

The Purge method has a default implementation that will remove all entries when data is a WeakEventManager.ListenerList.

Notes to Inheritors

If the underlying type for the Item[Object] is something other than WeakEventManager.ListenerList, or contains data beyond a WeakEventManager.ListenerList, you must override the Purge(Object, Object, Boolean) method. The override should provide purge behavior for the alternate type items list. Generally, the override should provide behavior without calling the base implementation. If a specific WeakEventManager.ListenerList still needs clearing, call Purge().

Applies to