WPF Binding FallbackValue set to Binding

Question

Is there a way to have another binding as a fallback value?

I\'m trying to do something like this:

Answer 1

If you run into problems with binding to null values and PriorityBinding (as Shimmy pointed out) you could go with MultiBinding and a MultiValueConverter like that:

public class PriorityMultiValueConverter : IMultiValueConverter
{
    public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
    {
        return values.FirstOrDefault(o => o != null);
    }

    public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}

Usage: