策略模式应用之商场收费系统(C#源代码)

来源：互联网发布：lols8 知乎编辑：程序博客网时间：2024/04/29 15:16
转自:http://blog.csdn.net/andylin02/archive/2008/11/14/3302034.aspx
using System;
namespace CashSystem
{
    //线程类 
    class CRunMain
    {
        public static void ShowMessage()
        {
            Console.WriteLine("-----------------please input your choise: ------------");
            Console.WriteLine("/t/t0. quite");
            Console.WriteLine("/t/t1. pay cash noremally");
            Console.WriteLine("/t/t2. pya cash in 8 rebate");
            Console.WriteLine("/t/t3. pay cash in after 300 return 100");
            Console.WriteLine("-------------------------------------------------------");
        }
        public static int Main()
        {
            CCashContext objCont = new CCashContext();
            CCashSuper objCash = null;
            while (true)
            {
                int nChoice = 0;
                int nCount = 0;
                double duMoney = 0.0;
                double duPrice = 0.0;
                ShowMessage();
                nChoice = Convert.ToInt32(Console.ReadLine());
                switch (nChoice)
                {
                    case 0:
                        Console.WriteLine("press any key to quit!");
                        Console.Read();
                        return 0;
                    case 1:
                        objCash = new CCashNormal();
                        break;
                        
                    case 2:
                        objCash = new CCashRebate(0.8);
                        break;
                    case 3:
                        objCash = new CCashReturn(300, 100);
                        break;
                    default:
                        objCash = null;
                        break;
                }
                if (null == objCash)
                {
                    Console.WriteLine("input error!");
                    continue;
                }
                //set cash object 
                objCont.SetBehavior(objCash);
                Console.WriteLine("please input price: ");
                duPrice = Convert.ToDouble(Console.ReadLine());
                Console.WriteLine("please input count: ");
                nCount = Convert.ToInt32(Console.ReadLine());
                duMoney = duPrice * nCount;
                Console.WriteLine("the properly money you should pay is " + objCont.GetResult(duMoney));
            }
        }
    };
    //收费策略Context 
    class CCashContext
    {
        //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(CCashSuper objCash)
        {
            this.m_objCash = objCash;
        }
        public double GetResult(double duMoney)
        {
            if (null == this.m_objCash)
            {
                Console.WriteLine("null == m_objCash");
                return 0;
            }
            return this.m_objCash.AcceptCash(duMoney);
        }
        private CCashSuper m_objCash;
    };
    abstract class CCashSuper
    {
        public abstract double AcceptCash(double duMoney);
    };
    class CCashReturn:CCashSuper
    {
        public CCashReturn(double duCondition, double duReturn)
        {
            this.m_duCondition = duCondition;
            this.m_duReturn = duReturn;
        }
        public override double AcceptCash(double duMoney)
        {
            if (duMoney > this.m_duCondition)
            {
                duMoney -= this.m_duReturn;
            }
            return duMoney;
        }
        private double m_duCondition = 0.0;
        private double m_duReturn = 0.0;
    };
    class CCashNormal:CCashSuper
    {
        public override double AcceptCash(double duMoney)
        {
            return duMoney;
        }
    };
    class CCashRebate:CCashSuper
    {
        public CCashRebate(double duRebate)
        {
            this.m_duRebate = duRebate;
        }
        public override double AcceptCash(double duMoney)
        {
            return duMoney * this.m_duRebate;
        }
        private double m_duRebate;
    };
}