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ItemContainerGenerator.ContainerFromIndex Method

.NET Framework 4.5

[This documentation is for preview only, and is subject to change in later releases. Blank topics are included as placeholders.]

Returns the element corresponding to the item at the given index within the ItemCollection.

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

Syntax

C++

public DependencyObject ContainerFromIndex(
	int index
)

Parameters

index: Type: System.Int32
The index of the desired item.

Return Value

Type: System.Windows.DependencyObject
Returns the element corresponding to the item at the given index within the ItemCollection or returns null if the item is not realized.

Examples

If you need to get a specific ListBoxItem at a particular index in a ListBox, you can use an ItemContainerGenerator.

The following example shows a ListBox and its items.

XAML


<ListBox Margin="10,0,0,5" Name="lb" VerticalAlignment="Top" Grid.Column="0" Grid.Row="2">
    <ListBoxItem>Item 0</ListBoxItem>
    <ListBoxItem>Item 1</ListBoxItem>
    <ListBoxItem>Item 2</ListBoxItem>
    <ListBoxItem>Item 3</ListBoxItem>
</ListBox>

The following example shows how to retrieve the item by specifying the index of the item in the ContainerFromIndex property of the ItemContainerGenerator.


private void GetIndex0(object sender, RoutedEventArgs e)
{
  ListBoxItem lbi = (ListBoxItem)
      (lb.ItemContainerGenerator.ContainerFromIndex(0));
  Item.Content = "The contents of the item at index 0 are: " +
      (lbi.Content.ToString()) + ".";
}

After you have retrieved the list box item, you can display the contents of the item, as shown in the following example.


Item.Content = "The contents of the item at index 0 are: " +
    (lbi.Content.ToString()) + ".";

Version Information

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Platforms

Windows 8 Consumer Preview, Windows Server 8 Beta, Windows 7, Windows Server 2008 SP2, 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.

Reference

ItemContainerGenerator Class

System.Windows.Controls Namespace

Other Resources

How to: Get a ComboBoxItem

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