VirtualizingStackPanel.AddCleanUpVirtualizedItemHandler Method (DependencyObject, CleanUpVirtualizedItemEventHandler)


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Adds an event handler for the CleanUpVirtualizedItem attached event.

Namespace:   System.Windows.Controls
Assembly:  PresentationFramework (in PresentationFramework.dll)

Public Shared Sub AddCleanUpVirtualizedItemHandler (
	element As DependencyObject,
	handler As CleanUpVirtualizedItemEventHandler


Type: System.Windows.DependencyObject

The DependencyObject that is listening for this event.

Type: System.Windows.Controls.CleanUpVirtualizedItemEventHandler

The event handler that is to be added.

The standard layout system creates item containers and computes layout for each item associated with a list control. The word "virtualize" refers to a technique by which a subset of UI elements are generated from a larger number of data items based on which items are visible on-screen. Generating many UI elements when only a few elements might be on the screen can adversely affect the performance of your application. The VirtualizingStackPanel calculates the number of visible items and works with the ItemContainerGenerator from an ItemsControl (such as ListBox or ListView) to create UI elements only for visible items.

.NET Framework
Available since 3.0
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