/// <summary>
    /// 状态接口
    /// </summary>
    public interface SimpleState
    {
        //检查购物车
        void CheckCart();
        //检查账号
        void CheckAcount();
        //提交订单
        void OrderSumbit();
    }

    public class Order
    {
        //初始状态
        SimpleState initsate;
        //待审核状态
        SimpleState Pendingsate;
        //提交后状态
        SimpleState submittedsate;

        public Order()
        {
            initsate = new InitState(this);
            Pendingsate = new Pendingsate(this);
            submittedsate = new submittedsate(this);
        }

        private SimpleState state;

        public void setState(SimpleState state)
        {
            this.state = state;
        }

        public SimpleState getInitState()
        {
            return initsate;
        }
        public SimpleState getPendingsate()
        {
            return Pendingsate;
        }
        public SimpleState getsubmittedsate()
        {
            return submittedsate;
        }

    }

    public class InitState : SimpleState
    {
        Order order;
        public InitState(Order order)
        {
            this.order = order;
        }
        public void CheckCart()
        {
            Console.WriteLine("订单进入初始状态");
            order.setState(order.getInitState());
        }
        public void CheckAcount()
        {
            Console.WriteLine("订单进入待审核状态");
            order.setState(order.getPendingsate());
        }
        public void OrderSumbit()
        {
            Console.WriteLine("该状态不能进入此步骤");           
        }

      
    }

    public class Pendingsate : SimpleState
    {
        Order order;
        public Pendingsate(Order order)
        {
            this.order = order;
        }
        public void CheckCart()
        {
            Console.WriteLine("该状态不能进入此步骤");
        }
        public void CheckAcount()
        {
            Console.WriteLine("订单进入待审核状态");
            order.setState(order.getPendingsate());
        }
        public void OrderSumbit()
        {
            Console.WriteLine("订单进入提交状态");
            order.setState(order.getsubmittedsate());
        }
    }

    public class submittedsate : SimpleState
    {
        Order order;
        public submittedsate(Order order)
        {
            this.order = order;
        }
        public void CheckCart()
        {
            Console.WriteLine("该状态不能进入此步骤");
        }
        public void CheckAcount()
        {
            Console.WriteLine("该状态不能进入此步骤");       
        }
        public void OrderSumbit()
        {
            Console.WriteLine("订单进入提交状态");
            order.setState(order.getsubmittedsate());
        }
    }