不，Adorner不会在WPF中自动获取其AdornedElement的DataContext

1 回答

• 1

  这证明（或可以证明）它没有：

  public class SomeObject
  { }
  
  public class SomeAdorner : Adorner
  {
      public SomeAdorner(UIElement adornedElement) : base(adornedElement)
      {
          // comment out the following statement to see that, by default, an adorner does not
          // take on the data context of its adorned ui element
          SetBinding(
              DataContextProperty,
              new Binding(DataContextProperty.Name)
              {
                  Mode = BindingMode.OneWay,
                  Source = adornedElement
              }
          );
      }
  
      protected override void OnPropertyChanged(DependencyPropertyChangedEventArgs e)
      {
          base.OnPropertyChanged(e);
  
          if ((e.Property.Name.Equals(DataContextProperty.Name)) && (e.NewValue is SomeObject))
          { MessageBox.Show("DataContext changed!"); }
      }
  }
  
  public partial class Window1 : Window
  {
      public Window1()
      {
          InitializeComponent();
          Loaded += new RoutedEventHandler(Window1_Loaded);
      }
  
      void Window1_Loaded(object sender, RoutedEventArgs e)
      {
          AdornerLayer.GetAdornerLayer(WindowContentWithElementName)
              .Add(new SomeAdorner(WindowContentWithElementName));
  
          WindowContentWithElementName.DataContext = new SomeObject();
      }
  }
  

  回复于 2024-04-28T15:21:57+08:00