TreeView.SelectedItemChanged 事件

定义

命名空间:

System.Windows.Controls

程序集:

PresentationFramework.dll

当 SelectedItem 更改时发生。

public:
 event System::Windows::RoutedPropertyChangedEventHandler<System::Object ^> ^ SelectedItemChanged;

public event System.Windows.RoutedPropertyChangedEventHandler<object> SelectedItemChanged;

member this.SelectedItemChanged : System.Windows.RoutedPropertyChangedEventHandler<obj> 

Public Custom Event SelectedItemChanged As RoutedPropertyChangedEventHandler(Of Object) 

事件类型

RoutedPropertyChangedEventHandler<Object>

示例

以下示例演示如何为 SelectedItemChanged 事件指定事件处理程序。

<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>

以下示例演示如何定义 事件处理程序。

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

Private Sub SelectionChanged(ByVal sender As Object, ByVal e As RoutedPropertyChangedEventArgs(Of Object))
    'Perform actions when SelectedItem changes
    MessageBox.Show((CType(e.NewValue, TreeViewItem)).Header.ToString())
End Sub

注解

路由事件信息

标识符字段	SelectedItemChangedEvent
路由策略	鼓 泡
委托	RoutedPropertyChangedEventHandler<T>

XAML 属性用法

<object SelectedItemChanged="RoutedPropertyChangedEventHandler"/>