StatePattern

class Program
    {
        static void Main(string[] args)
        {
            var state = new OpeningState();
            var lift = new Lift();
            lift.SetListState(state);
            lift.Close();
            lift.Open();

            lift.Run();
            lift.Stop();
            Console.Read();
        }
    }
    public abstract class LiftState
    {
        protected Lift Lift;

        public void SetLift(Lift lift)
        {
            this.Lift = lift;
        }
        public abstract void Open();
        public abstract void Close();
        public abstract void Run();
        public abstract void Stop();
    }
    public class OpeningState : LiftState
    {
        public override void Open()
        {
            Console.WriteLine("电梯打开!");
        }

        public override void Close()
        {
            base.Lift.SetListState(Lift.CloseingState);
            base.Lift.Close();
        }

        public override void Run()
        {
            Console.WriteLine("打开不能运行");
        }

        public override void Stop()
        {
            base.Lift.SetListState(Lift.StopingState);
            base.Lift.Stop();
        }
    }
    public class ClosingState : LiftState
    {
        public override void Open()
        {
            base.Lift.SetListState(Lift.OpeningState);
            base.Lift.Open();
        }

        public override void Close()
        {
            Console.WriteLine("电梯关闭!");
        }

        public override void Run()
        {
            base.Lift.SetListState(Lift.RuningState);
            base.Lift.Open();
        }

        public override void Stop()
        {
            base.Lift.SetListState(Lift.StopingState);
            base.Lift.Stop();
        }
    }
    public class RuningState : LiftState
    {
        public override void Open()
        {
            base.Lift.SetListState(Lift.OpeningState);
            base.Lift.Open();
        }

        public override void Close()
        {
            base.Lift.SetListState(Lift.CloseingState);
            base.Lift.Close();

        }

        public override void Run()
        {
            Console.WriteLine("电梯运行!");
        }

        public override void Stop()
        {
            base.Lift.SetListState(Lift.StopingState);
            base.Lift.Stop();
        }
    }
    public class StopingState : LiftState
    {
        public override void Open()
        {
            base.Lift.SetListState(Lift.OpeningState);
            base.Lift.Open();
        }

        public override void Close()
        {
            base.Lift.SetListState(Lift.CloseingState);
            base.Lift.Close();
        }

        public override void Run()
        {
            base.Lift.SetListState(Lift.RuningState);
            base.Lift.Open();
        }

        public override void Stop()
        {
            Console.WriteLine("电梯停止!");
        }
    }

    public class Lift
    {
        public static LiftState OpeningState = new OpeningState();
        public static LiftState CloseingState = new ClosingState();
        public static LiftState RuningState = new RuningState();
        public static LiftState StopingState = new StopingState();

        private LiftState _liftState;
        public LiftState GetState()
        {
            return this._liftState;
        }

        public void SetListState(LiftState state)
        {
            this._liftState = state;
            this._liftState.SetLift(this);
        }
        public void Open()
        {
            this._liftState.Open();
        }
        public void Close()
        {
            this._liftState.Close();
        }
        public void Stop()
        {
            this._liftState.Stop();
        }
        public void Run()
        {
            this._liftState.Run();
        }
    }