SilverLight DataGrid 自訂欄資料繫結 上下文代理器 DataContextProxy

public class DataContextProxy : FrameworkElement    {        public DataContextProxy()        {            this.Loaded += new RoutedEventHandler(DataContextProxy_Loaded);        }        void DataContextProxy_Loaded(object sender, RoutedEventArgs e)        {            Binding binding = new Binding();            if (!String.IsNullOrEmpty(BindingPropertyName))            {                binding.Path = new PropertyPath(BindingPropertyName);            }            binding.Source = this.DataContext;            binding.Mode = BindingMode;            this.SetBinding(DataContextProxy.DataSourceProperty, binding);        }        public Object DataSource        {            get { return (Object)GetValue(DataSourceProperty); }            set { SetValue(DataSourceProperty, value); }        }        public static readonly DependencyProperty DataSourceProperty =            DependencyProperty.Register("DataSource", typeof(Object), typeof(DataContextProxy), null);        public string BindingPropertyName { get; set; }        public BindingMode BindingMode { get; set; }    }