TreeViewItem Class

Updated: February 2009

Implements a selectable item in a TreeView control.

Namespace:  System.Windows.Controls
Assembly:  PresentationFramework (in PresentationFramework.dll)
XMLNS for XAML: http://schemas.microsoft.com/winfx/2006/xaml/presentation, http://schemas.microsoft.com/netfx/2007/xaml/presentation

[TemplatePartAttribute(Name = "PART_Header", Type = typeof(FrameworkElement))]
[StyleTypedPropertyAttribute(Property = "ItemContainerStyle", StyleTargetType = typeof(TreeViewItem))]
public class TreeViewItem : HeaderedItemsControl
<TreeViewItem>
  Items
</TreeViewItem>

Content Model: TreeViewItem is a HeaderedItemsControl. Its content properties are Items and ItemsSource, and its header property is Header. For more information on the content model for TreeViewItem, see Controls Content Model Overview.

TreeViewItem controls can be embedded inside other TreeViewItem controls to create a hierarchy of nodes inside a TreeView control.

The following illustration shows a hierarchy of TreeViewItem controls inside a TreeView.

TreeView illustration

To expand or collapse a TreeViewItem, use the IsExpanded property.

For more information about the TreeView control, see the TreeView Overview.

Dependency properties for this control might be set by the control’s default style. If a property is set by a default style, the property might change from its default value when the control appears in the application. The default style is determined by which desktop theme is used when the application is running. For more information, see Themes.

The following example shows how to create a hierarchy of TreeViewItem controls in a TreeView control.

<TreeView Name="myTreeViewEvent" >
  <TreeViewItem Header="Employee1" IsSelected="True">
    <TreeViewItem Header="Jesper Aaberg"/>
    <TreeViewItem Header="Employee Number">
      <TreeViewItem Header="12345"/>
    </TreeViewItem>
    <TreeViewItem Header="Work Days">
      <TreeViewItem Header="Monday"/>
      <TreeViewItem Header="Tuesday"/>
      <TreeViewItem Header="Thursday"/>
    </TreeViewItem>
  </TreeViewItem>
  <TreeViewItem Header="Employee2">
    <TreeViewItem Header="Dominik Paiha"/>
    <TreeViewItem Header="Employee Number">
      <TreeViewItem Header="98765"/>
    </TreeViewItem>
    <TreeViewItem Header="Work Days">
      <TreeViewItem Header="Tuesday"/>
      <TreeViewItem Header="Wednesday"/>
      <TreeViewItem Header="Friday"/>
    </TreeViewItem>
  </TreeViewItem>
</TreeView>

More Code

How to: Create Simple or Complex TreeViews This example shows how to create simple or complex TreeView controls.

System.Object
  System.Windows.Threading.DispatcherObject
    System.Windows.DependencyObject
      System.Windows.Media.Visual
        System.Windows.UIElement
          System.Windows.FrameworkElement
            System.Windows.Controls.Control
              System.Windows.Controls.ItemsControl
                System.Windows.Controls.HeaderedItemsControl
                  System.Windows.Controls.TreeViewItem

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0

Date

History

Reason

February 2009

Described how default styles change dependency properties.

Customer feedback.

July 2008

Added new members: MeasureOverride method, PrepareContainerForItemOverride method.

SP1 feature change.

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