TreeView.SelectedItemChanged Evento

Definizione

Spazio dei nomi:

System.Windows.Controls

Assembly:

PresentationFramework.dll

Si verifica quando la proprietà SelectedItem viene modificata.

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) 

Tipo evento

RoutedPropertyChangedEventHandler<Object>

Esempio

Nell'esempio seguente viene illustrato come specificare un gestore eventi per l'evento 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>

Nell'esempio seguente viene illustrato come definire il gestore eventi.

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

Commenti

Informazioni evento indirizzato

Campo identificatore	SelectedItemChangedEvent
Strategia di routing	Bubbling
Delegato	RoutedPropertyChangedEventHandler<T>

Uso della sintassi XAML per gli attributi

<object SelectedItemChanged="RoutedPropertyChangedEventHandler"/>