Binding can only be set on a DependencyProperty of a DependencyObject - when property is overridden with new

Question

I have a class hierarchy as follows and binding to the VisibleRange property is throwing in the designer. Given the class hierarchy here: ``` // Base class public abstract class AxisBase : ContentControl, IAxis { public static readonly DependencyProperty VisibleRangeProperty = DependencyProperty.Register( "VisibleRange", typeof(IRange), typeof(AxisBase), new PropertyMetadata(default(IRange), OnVisibleRangeChanged)); public IRange VisibleRange { get { return (IRange)GetValue(VisibleRangeProperty); } set { SetValue(VisibleRangeProperty, value); } } } // Derived class public class DateTimeAxis : AxisBase { public new IRange VisibleRange { get { return (IRange)GetValue(VisibleRangeProperty); } set { SetValue(VisibleRangeProperty, value); } } } // And interface definitions public interface IRange : IRange { } ``` And designer (XAML) here: ```

Accepted Answer

The 'dependency property' is the thing you registered with:

```
 public static readonly DependencyProperty VisibleRangeProperty = 
    DependencyProperty.Register("VisibleRange", typeof(IRange), typeof(AxisBase), ...);
```

And when you look at that statement you can see that it is registering with `typeof(IRange)`

The derived class DateTimeAxis is exposing the VisibleRange property which is overridden by the new keyword.

Yes, but it is exposing a 'normal' property, not a Dependency Property. Another factor is that the properties have different types.

Binding can only be set on a DependencyProperty of a DependencyObject - when property is overridden with new

Solution

Problem