No, an Adorner DOES NOT automagically take the DataContext of its AdornedElement in WPF
-
12-09-2019 - |
Question
Original question: Does an Adorner
automagically inherit the "DataContext" of its "AdornedElement" in WPF?
Solution
This proves (or can prove) that it doesn't:
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();
}
}
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