switch (_mediaState)            {                case State.Run:                  AAA();                    break;                case State.Stop:                   BBB();                    break;                case State.Forward:                    CCC();                    break;                case State.Rewind:                    DDD();                    break;            }

public delegate void RelaceSwitch();private  static Dictionary
     
       ReplaceSwitch=new Dictionary
      
       ();        public static void MethodRun()        {            AAA();        }        public static void MethodStop()        {            BBB();        }        public static void MethodForward()        {            CCC();        }        public static void MethodRewind()        {            DDD();        }        private static void Adddic()        {            ReplaceSwitch.Add(State.Run, MethodRun);//ReplaceSwitch[State.Run]=MethodRun;            ReplaceSwitch.Add(State.Stop, MethodStop);            ReplaceSwitch.Add(State.Forward, MethodForward);            ReplaceSwitch.Add(State.Rewind, MethodRewind);        }        private static void Exec(State state, RelaceSwitch action)        {            action.Invoke();        }
      
     

调用

去掉switch

首先Adddic();

之后Exec(_mediaState, ReplaceSwitch[_mediaState]);