如何将父元素属性和子usercontrol元素属性多重绑定

MultiBinding multiBinding = new MultiBinding();
childUserControl.SetBinding(UserControl.SomePropertyProperty, multiBinding);

Binding parentBinding = new Binding("ParentProperty");
multiBinding.Bindings.Add(parentBinding);

Binding childBinding = new Binding("ChildProperty");
multiBinding.Bindings.Add(childBinding);

multiBinding.Converter = new MyMultiValueConverter();

public class MyMultiValueConverter : IMultiValueConverter
{
    public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
    {
        // 对父元素属性和子元素属性的值进行处理，并返回最终的绑定目标属性的值
        return /* 最终的绑定目标属性的值 */;
    }

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