Szerkesztés

Megosztás a következőn keresztül:

VirtualizingPanel.VirtualizationMode Attached Property

  • Reference

Definition

Namespace:
System.Windows.Controls
Assembly:
PresentationFramework.dll

Gets or sets how a panel in an ItemsControl virtualizes its child items.

see GetVirtualizationMode, and SetVirtualizationMode
see GetVirtualizationMode, and SetVirtualizationMode
see GetVirtualizationMode, and SetVirtualizationMode

Examples

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.

Applies to