Namespace:
System.Windows.Controls
Assembly:
PresentationFramework (in PresentationFramework.dll)
XMLNS for XAML: http://schemas.microsoft.com/winfx/2006/xaml/presentation, http://schemas.microsoft.com/netfx/2007/xaml/presentation
Visual Basic (Declaration)
See GetIsVirtualizing, SetIsVirtualizing
See GetIsVirtualizing, SetIsVirtualizing
See GetIsVirtualizing, SetIsVirtualizing
See GetIsVirtualizing, SetIsVirtualizing
See GetIsVirtualizing, SetIsVirtualizing
<object VirtualizingStackPanel.IsVirtualizing="bool" .../>
Dependency Property Information
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.
The following example shows how to bind to an XML data source and virtualize the items displayed in a ListBox element by using XAML. Notice that the IsVirtualizing attached property is explicitly set to true.
<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
WindowTitle="VirtualizingStackPanel Sample"
Height="150"
VerticalAlignment="Top">
<Page.Resources>
<XmlDataProvider x:Key="Leagues" Source="Leagues.xml" XPath="Leagues/League"/>
<DataTemplate x:Key="NameDataStyle">
<TextBlock Text="{Binding XPath=@name}" FontFamily="Arial" FontSize="12" Foreground="Black"/>
</DataTemplate>
</Page.Resources>
<Border HorizontalAlignment="Left"
VerticalAlignment="Top"
BorderBrush="Black"
BorderThickness="2">
<ScrollViewer>
<StackPanel DataContext="{Binding Source={StaticResource Leagues}}">
<TextBlock Text="{Binding XPath=@name}" FontFamily="Arial" FontSize="18" Foreground="Black"/>
<ListBox VirtualizingStackPanel.IsVirtualizing="True"
ItemsSource="{Binding XPath=Team}"
ItemTemplate="{DynamicResource NameDataStyle}"/>
</StackPanel>
</ScrollViewer>
</Border>
</Page>
Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
.NET Framework
Supported in: 3.5, 3.0
Reference
Other Resources