ItemContainerGenerator Class
Provides mappings between the items of an ItemsControl and their container elements.
Namespace: System.Windows.Controls
Assembly: System.Windows (in System.Windows.dll)
The ItemContainerGenerator type exposes the following members.
| Name | Description | |
|---|---|---|
![]() ![]() | ContainerFromIndex | Returns the container for the item at the specified index within the ItemCollection. |
![]() ![]() | ContainerFromItem | Returns the container corresponding to the specified item. |
![]() ![]() | Equals(Object) | Determines whether the specified Object is equal to the current Object. (Inherited from Object.) |
![]() ![]() | Finalize | Allows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.) |
![]() ![]() | GeneratorPositionFromIndex | Gets the generated position of the item at the specified index. |
![]() ![]() | GetHashCode | Serves as a hash function for a particular type. (Inherited from Object.) |
![]() ![]() | GetType | Gets the Type of the current instance. (Inherited from Object.) |
![]() ![]() | IndexFromContainer | Returns the index to the item that has the specified, generated container. |
![]() ![]() | IndexFromGeneratorPosition | Returns the index that maps to the specified GeneratorPosition. |
![]() ![]() | ItemFromContainer | Returns the item that corresponds to the specified, generated container. |
![]() ![]() | MemberwiseClone | Creates a shallow copy of the current Object. (Inherited from Object.) |
![]() ![]() | ToString | Returns a string that represents the current object. (Inherited from Object.) |
| Name | Description | |
|---|---|---|
![]() ![]() ![]() | IItemContainerGenerator.GenerateNext | Returns the container element used to display the next item, and whether the container element has been newly generated (realized). |
![]() ![]() ![]() | IItemContainerGenerator.GetItemContainerGeneratorForPanel | Returns the ItemContainerGenerator appropriate for use by the specified panel. |
![]() ![]() ![]() | IItemContainerGenerator.PrepareItemContainer | Prepares the specified element as the container for the corresponding item. |
![]() ![]() ![]() | IItemContainerGenerator.Remove | Removes one or more generated (realized) items. |
![]() ![]() ![]() | IItemContainerGenerator.RemoveAll | Removes all generated (realized) items. |
![]() ![]() ![]() | IItemContainerGenerator.StartAt | Prepares the generator to generate items, starting at the specified GeneratorPosition, and in the specified GeneratorDirection, and controlling whether or not to start at a generated (realized) item. |
![]() ![]() ![]() | IRecyclingItemContainerGenerator.Recycle | Disassociates item containers from their data items and saves the containers so they can be reused later for other data items. |
The ItemContainerGenerator class maintains associations between items controls and their item containers, such as ListBox and ListBoxItem. If a control has an associated ItemContainerGenerator, you will be able to retrieve it through a property on the control
You can use the ItemContainerGenerator to retrieve items based on their index or containers by specifying the data item. For example, if you have a data-bound TreeView, and you want to get a TreeViewItem based on its index, you can use the ContainerFromIndex method. If you want to retrieve the data item, use ItemFromContainer method.
The following example shows how to retrieve an ItemContainerGenerator for a TreeView object and use the ContainerFromIndex method.
Public Sub New() InitializeComponent() Dim myItems As String() = New String() {"Item 1", "Item 2", "Item 3", "Item 4", "Item 5"} myTreeView.DataContext = myItems End Sub Shared count As Integer = 1 Private Sub Button_Click(ByVal sender As Object, ByVal e As RoutedEventArgs) Dim item As TreeViewItem = DirectCast(myTreeView.ItemContainerGenerator.ContainerFromIndex(3), TreeViewItem) item.IsExpanded = True If count < 5 Then item.Items.Add("Child " & count.ToString()) count += 1 End If End Sub
<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>
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.





