1 //声明委托 2 public delegate void StartClockDelegate(); 3         public delegate void StopClockDelegate(); 4 //创建委托实例 5         public StartClockDelegate StartClocks; 6         public StopClockDelegate StopClocks; 7 //通过调用委托调用方法 8         public void StartClockRunning() 9         {10             this.StartClocks();11         }12         public void StopClockRunning()13         {14             this.StopClocks();15         }16 17 18 //将方法加到委托中19 controller.StartClocks += localClock.StartLocalClock;20             controller.StartClocks += londonClock.StartEuropeanClock;21             controller.StartClocks += newYorkClock.StartAmericanClock;22             controller.StartClocks += tokyoClock.StartJapaneseClock;23             controller.StopClocks += localClock.StopLocalClock;24             controller.StopClocks += londonClock.StopEuropeanClock;25             controller.StopClocks += newYorkClock.StopAmericanClock;26             controller.StopClocks += tokyoClock.StopJapaneseClock;