VirtualizingStackPanel.AddCleanUpVirtualizedItemHandler Method

Adds an event handler for the CleanUpVirtualizedItem attached event.

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

public static void AddCleanUpVirtualizedItemHandler(
	DependencyObject element,
	CleanUpVirtualizedItemEventHandler handler
)

Parameters

element
Type: System.Windows.DependencyObject

The DependencyObject that is listening for this event.

handler
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

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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