VirtualizingPanel.VirtualizationMode Attached Property
Definition
Important
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Gets or sets how a panel in an ItemsControl virtualizes its child items.
see GetVirtualizationMode, and SetVirtualizationModesee GetVirtualizationMode, and SetVirtualizationModesee GetVirtualizationMode, and SetVirtualizationModeExamples
The following example creates a ListBox and sets the VirtualizingPanel.VirtualizationMode attached property to Recycling.
<StackPanel>
<StackPanel.Resources>
<src:LotsOfItems x:Key="data"/>
</StackPanel.Resources>
<ListBox Height="150" ItemsSource="{StaticResource data}"
VirtualizingStackPanel.VirtualizationMode="Recycling" />
</StackPanel>
The following example shows the data used in the previous example.
public class LotsOfItems : ObservableCollection<String>
{
public LotsOfItems()
{
for (int i = 0; i < 1000; ++i)
{
Add("item " + i.ToString());
}
}
}
Public Class LotsOfItems
Inherits ObservableCollection(Of String)
Public Sub New()
For i As Integer = 0 To 999
Add("item " & i.ToString())
Next
End Sub
End Class
Remarks
By default, a VirtualizingPanel creates an item container for each visible item and discards it when it is no longer needed (such as when the item is scrolled out of view). When an ItemsControl contains a lot of items, the process of creating and discarding item containers can negatively affect performance. When VirtualizingPanel.VirtualizationMode is set to Recycling, the VirtualizingPanel reuses item containers instead of creating a new one each time.
