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TreeView.SelectedItemChanged Event

.NET Framework 4

Occurs when the SelectedItem changes.

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

Syntax

C++

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public event RoutedPropertyChangedEventHandler<Object> SelectedItemChanged

XAML Attribute Usage

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<object SelectedItemChanged="RoutedPropertyChangedEventHandler"/>

Routed Event Information

Identifier Field	SelectedItemChangedEvent
Routing Strategy	Bubbling
Delegate	RoutedPropertyChangedEventHandler<T>

Examples

The following example shows how to specify an event handler for the SelectedItemChanged event.

XAML

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<TreeView SelectedItemChanged="SelectionChanged">
  <TreeViewItem Header="Employee1" IsSelected="True">
    <TreeViewItem Header="Jesper"/>
    <TreeViewItem Header="Aaberg"/>
    <TreeViewItem Header="12345"/>
  </TreeViewItem>
  <TreeViewItem Header="Employee2">
    <TreeViewItem Header="Dominik"/>
    <TreeViewItem Header="Paiha"/>
    <TreeViewItem Header="98765"/>
  </TreeViewItem>
</TreeView>

The following example shows how to define the event handler.

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private void SelectionChanged(object sender, RoutedPropertyChangedEventArgs<Object> e)
{
    //Perform actions when SelectedItem changes
    MessageBox.Show(((TreeViewItem) e.NewValue).Header.ToString());
}

Version Information

.NET Framework

Supported in: 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Platforms

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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

Reference

TreeView Class

System.Windows.Controls Namespace

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FAQ

Can e.NewValue be null?

If somehow the treeview loses its selection will e.NewValue be null? In this case the proposed event handler is wrong.

History

8/18/2011
Ignacio Soler