Raises the CleanUpVirtualizedItem event for rows that have scrolled out of view.
Assembly: PresentationFramework (in PresentationFramework.dll)
By default, the DataGridRowsPresenter class maintains DataGridRow instances only for data items that are currently on display within the user interface. When rows are scrolled out of view, the DataGridRow instances become available for garbage collection.
This method override cancels cleanup for rows that have validation errors. You can override this method or handle the CleanUpVirtualizedItem event to provide your own logic for canceling the cleanup of particular rows.
Raising an event invokes the event handler through a delegate. For more information, see Raising an Event.
The method also allows derived classes to handle the event without attaching a delegate. This is the preferred technique for handling the event in a derived class.Notes to Inheritors
When overriding in a derived class, make sure to call the base class’s method so that registered delegates receive the event.
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2