Detect DataContext change in user control

Question

I am implementing an UserControl and I want to detect if the DataContext is changed from the code. FrameworkElement.DataContext.Get is not virtual so I can't override it. I can hide it with new but I believe there is better way to do this. In WPF there is something like DataContextChanged event. Can we do something similar with Windows Phone?

Answer 1

In your user control constructor add this:

this.SetBinding(BoundDataContextProperty, new Binding());

Then add these:

public static readonly DependencyProperty BoundDataContextProperty = DependencyProperty.Register(
    "BoundDataContext",
    typeof(object),
    typeof(MyUserControl),
    new PropertyMetadata(null, OnBoundDataContextChanged));

private static void OnBoundDataContextChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
    // e.NewValue is your new DataContext
    // d is your UserControl
}