wpf----命令(Command)

 public class DataCommands
    {
        private static RoutedUICommand requery;
        static DataCommands()
        {
            InputGestureCollection inputs = new InputGestureCollection();
            inputs.Add(new KeyGesture(Key.R, ModifierKeys.Control, "Ctrl+R"));
            requery = new RoutedUICommand(
              "Requery", "Requery", typeof(DataCommands), inputs);
        }

        public static RoutedUICommand Requery
        {
            get { return requery; }
        }
    }