策略

 

        //策略模式
        static void Behavior()
        ...{
            CushContext cc = new CushContext();
            CushSuper cs = null;
            Console.Write("请输入价格 ");
            string douPrice = Console.ReadLine();
            Console.Write("请输入数量 ");
            string douNum = Console.ReadLine();
            Console.Write("请选择收费类型;0正常收费,1打折，2买300送100n");
            string strType = Console.ReadLine();
            switch (strType)
            ...{
                case "0":
                    cs = new CushSuperNormal();
                    //cs = (CushSuper)Assembly.Load("Head First Desig").CreateInstance("Head_First_Desig.CushSuperNormal");
                    break;
                case "1":
                    cs = new CushSuperRebate("0.8");
                    break;
                case "2":
                   // cs = new CushReturn(300, 100);
                    break;
            }
            cc.setBehavior(cs);
            double result = cc.GetResult(double.Parse(douPrice) * double.Parse(douNum));
            Console.Write("应收费:" + result.ToString());
            Console.Read();

        }
        //

 

using System;
using System.Collections.Generic;
using System.Text;

namespace Head_First_Desig
...{
   public abstract class CushSuper
    ...{
        public abstract double acceptCush(double money);


    }
    class CushSuperNormal : CushSuper
    ...{
        public override double acceptCush(double money)
        ...{
            return money;
        }
    }

     class CushSuperRebate : CushSuper
    ...{
        private double rebate = 1d;
        public CushSuperRebate(string Rebate)
        ...{
            this.rebate = double.Parse(Rebate);
        }
        public override double acceptCush(double money)
        ...{
            return money * rebate;
        }
    }
     class CushReturn : CushSuper
    ...{
        private double condition = 0.0d;
        private double moneyReturn = 0.0d;
         public CushReturn(string Condition, string MoneyReturn)
         ...{
             this.condition = double.Parse(Condition);
             this.moneyReturn = double.Parse(MoneyReturn);
         }
        public override double acceptCush(double money)
        ...{
            double result = 0.0d;
            if (money > condition)
            ...{
                result = money - Math.Floor(money / condition) * moneyReturn;
            }
            return result;
        }
    }
    class CushFactory
    ...{
        public static CushSuper createCushAccept(string type)
        ...{
            CushSuper cs = null;
            switch (type)
            ...{
                case "0":
                    cs = new CushSuperNormal();
                    break;
                case "1":
                    cs = new CushSuperRebate("0.8");
                    break;
                case "2":
                    //cs = new CushReturn(300, 100);
                    break;
            }
            return cs;
        }
    }
}

 

 

using System;
using System.Collections.Generic;
using System.Text;

namespace Head_First_Desig
{
    class CushContext
    {
        //声明一个现金收费父类对象
        private CushSuper cs;
        //设置策略行为，参数为具体的现金收费子类（正常，打折或返利）
        public void setBehavior(CushSuper cs)
        {
            this.cs = cs;
        }
        //得到现金促销计算结果（利用了多态机制，不同的策略行为导致不同的结果）
        public double GetResult(double money)
        {
            return cs.acceptCush(money);
        }
    }
}