Question

Say I have the following Code:

   public static DependencyProperty LabelProperty =
        DependencyProperty.RegisterAttached(
            "Label",
            typeof(Label),
            typeof(HotKeyHelper),
            new FrameworkPropertyMetadata(default(Label), OnLabelChanged)
        );

    public static void SetLabel(DependencyObject obj, Label value)
    {
        obj.SetValue(LabelProperty, value);
    }

    public static Label GetLabel(DependencyObject obj)
    {
        return (Label)obj.GetValue(LabelProperty);
    }

    private static void OnLabelChanged(DependencyObject obj,
         DependencyPropertyChangedEventArgs e)
    {
        Label label = obj as Label;

        // Question is for Right Here!
    }

Is there a way in the OnLabelChanged event to get the object it is attached to?

For example, say I use this like this:

  <TextBox Controls:HotKeyHelper.Label="{Binding ElementName=SomeLabel}"/>

Is there a way to get a reference to the SomeLabel label in my OnLabelChanged event?

Answer 1

e.NewValue?

obj should be the object the attached property is set on, i doubt that you’ll want to cast it to Label as it can be anything…