Handles the Selected event for all TreeViewItems

     
<Window x:Class="WpfApplication1.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="WPF" Height="200" Width="300">
    <DockPanel LastChildFill="True">
        <DockPanel.Resources>
            <Style TargetType="{x:Type TreeViewItem}">
                <EventSetter Event="Selected" Handler="TreeViewItem_Selected" />
            </Style>
        </DockPanel.Resources>
        <Button Click="Button_Click" DockPanel.Dock="Bottom" Content="Show Selected" MaxHeight="23" MaxWidth="100" />
        <TreeView FontSize="16" Name="tvTree">
            <TreeViewItem Header="A" IsExpanded="True">
                <TreeViewItem Header="1">
                    <TreeViewItem Header="2" />
                    <TreeViewItem Header="3" />
                </TreeViewItem>
                <TreeViewItem Header="B" IsExpanded="True">
                    <TreeViewItem Header="11" />
                    <TreeViewItem Header="22" />
                </TreeViewItem>
            </TreeViewItem>
            <TreeViewItem Header="C">
                <TreeViewItem Header="E">
                    <TreeViewItem Header="111" />
                    <TreeViewItem Header="222" />
                    <TreeViewItem Header="333" />
                </TreeViewItem>
                <TreeViewItem Header="F">
                    <TreeViewItem Header="1111" />
                    <TreeViewItem Header="2222" />
                    <TreeViewItem Header="333" />
                </TreeViewItem>
            </TreeViewItem>
        </TreeView>
    </DockPanel>
</Window>

//File:Window.xaml.vb
Imports System
Imports System.Windows
Imports System.Windows.Controls

Namespace WpfApplication1
  Public Partial Class Window1
    Inherits Window
    Public Sub New()
      InitializeComponent()
    End Sub
    Private Sub TreeViewItem_Selected(sender As Object, e As RoutedEventArgs)
      Dim item As TreeViewItem = TryCast(sender, TreeViewItem)
      If item Is e.OriginalSource Then
        Console.WriteLine(item.Header)
        Console.WriteLine(item.Items.Count)
      Else
        Console.WriteLine("Parent of selected")
        Console.WriteLine(item.Header)
        Console.WriteLine(item.Items.Count)
      End If
    End Sub

    Private Sub Button_Click(sender As Object, e As RoutedEventArgs)
      Dim item As TreeViewItem = TryCast(tvTree.SelectedItem, TreeViewItem)

      If item IsNot Nothing Then
        MessageBox.Show("Item selected: " & Convert.ToString(item.Header), Title)
      Else
        MessageBox.Show("No item selected", Title)
      End If
    End Sub
  End Class
End Namespace

Related examples in the same category

1.	Bind a TreeView to a data source and use DataTemplate objects to customize the TreeView.
2.	Set TreeView with TreeViewItem
3.	View and Select Items Using a Tree
4.	Get selected tree node item

Handles the Selected event for all TreeViewItems : TreeView « Windows Presentation Foundation « VB.Net

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