Custom object as a DependencyProperty

Question

I have a custom class, MyPerson. All (relevant) properties implement INotifyPropertyChanged. I created a UserControl to display it, and it all worked fine. Binding to properties like MyPerson.FirstName (a string) all work - they display and update (two way binding) as expected.

Now I want to do more complex stuff in the codebehind, so I wanted to create a DependencyProperty with a PropertyType of MyPerson, but I'm not sure how to construct the DependencyProperty, in particular the PropertyChangedCallback part.

Can this be done? How so?

Answer 1

Read on this article - Custom Dependency Properties

Something like -

public static readonly DependencyProperty MyPersonValueProperty = 
      DependencyProperty.Register( "MyPersonValue", typeof(MyPerson), 
         typeof(MyPersonControl), new FrameworkPropertyMetadata(null, 
             FrameworkPropertyMetadataOptions.AffectsRender,
               new PropertyChangedCallback(OnPersonChanged) ) ); 

public MyPerson ThePerson
{ 
    get { return (MyPerson)GetValue(MyPersonValueProperty); }
    set { SetValue(MyPersonValueProperty, value); }
}

private static void OnPersonChanged(DependencyObject d, 
                                 DependencyPropertyChangedEventArgs e)
{
    // Property change code here
}