When working with WPF it can be necessary to extend a control to enable data-binding to a property that isn’t bind-able (because it is not a dependency property etc.). The following code demonstrates an example I have made where I override a Text property and give it a dependency property to enable data-binding.
public static readonly DependencyProperty TextProperty = DependencyProperty.Register("Text", typeof(string), typeof(TextEditorControl), new FrameworkPropertyMetadata(OnTextPropertyChanged));
private static void OnTextPropertyChanged(DependencyObject dp, DependencyPropertyChangedEventArgs e)
{
//TODO: action handler here
}
public override string Text
{
get
{
return (string)GetValue(TextProperty) ?? string.Empty;
}
set
{
base.Text = value;
SetValue(TextProperty, value);
}
}
The code also shows how to handle the event raised when the binding source (the view model) is updated. I recommend using dependency properties for WPF controls; as for view model classes I recommend implementing the INotifyPropertyChanged interface instead.
