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();        }    }