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ItemContainerGenerator.ContainerFromIndex Method

Returns the container for the item at the specified index within the ItemCollection.

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

public DependencyObject ContainerFromIndex(
	int index
)

Parameters

index
Type: System.Int32
The index of the item to retrieve.

Return Value

Type: System.Windows.DependencyObject
The container for the item at the specified index within the item collection, if the item has a container; otherwise, null.

If there is no item at the specified index or the item has no container, the ContainerFromIndex method returns null.

The following example shows how to retrieve an ItemContainerGenerator for a TreeView object and use the ContainerFromIndex method.

Run this sample


public MainPage()
{
    InitializeComponent();
    string[] myItems = new string[]{"Item 1", "Item 2", "Item 3", "Item 4", "Item 5"};
    myTreeView.DataContext = myItems;
}
static int count = 1;
private void Button_Click(object sender, RoutedEventArgs e)
{
    TreeViewItem item = (TreeViewItem)myTreeView.ItemContainerGenerator.ContainerFromIndex(3);
    item.IsExpanded = true;
    if (count < 5)
    {
        item.Items.Add("Child " + count.ToString());
        count++;
    }
}



<StackPanel x:Name="LayoutRoot" Background="White">
    <sdk:TreeView x:Name="myTreeView" Width="200" ItemsSource="{Binding}" Margin="5"/>
    <Button Content="Add Child to Item 4" Width="150" Click="Button_Click"/>
</StackPanel>


Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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