TreeView.SelectedItemChanged 事件

定義

命名空間:
System.Windows.Controls
組件:
PresentationFramework.dll

發生在變化 SelectedItem 時。

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)

事件類型

RoutedPropertyChangedEventHandler<Object>

範例

以下範例說明如何指定事件處理程序。SelectedItemChanged

<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>

以下範例說明如何定義事件處理程序。

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

備註

路由事件資訊

Item 價值觀
標識元欄位 SelectedItemChangedEvent
路由策略 氣泡
代理人 RoutedPropertyChangedEventHandler<T>

XAML 屬性使用方式

<object SelectedItemChanged="RoutedPropertyChangedEventHandler"/>

適用於