.Net学习笔记----2015-06-30(超市收银系统02)

    class SupperMarket
    {
        //创建仓库对象
        CangKu ck = new CangKu();
        public SupperMarket()
        {
            ck.JinPros("Acer", 1000);
            ck.JinPros("SamSung", 1000);
            ck.JinPros("JiangYou", 1000);
            ck.JinPros("Banana", 1000);
        }
        /// <summary>
        /// 跟用户交互的过程
        /// </summary>
        public void AskBuying()
        {
            Console.WriteLine("欢迎光临，请问您需要些什么？");
            Console.WriteLine("我们有 Acer、SamSung、JiangYou、Banana");
            string strType = Console.ReadLine();
            Console.WriteLine("您需要多少？");
            int count = Convert.ToInt32(Console.ReadLine());
            //去仓库取货
            ProductFather[] pros = ck.QuPros(strType, count);
            //计算价钱
            double realMoney = GetMoney(pros);
            Console.WriteLine("您总共应付{0}元", realMoney);
            Console.WriteLine("请选择打折方式 1--不打折 2--打九折 3--打85折 4--买300送50  5--买500送100");
            string input = Console.ReadLine();
            //通过简单工厂的设计模式，根据用户的输入获得一个打折对象
            CalFather cal = GetCal(input);
            double totalMoney = cal.GetTotalMoney(realMoney);
            Console.WriteLine("打完折后，您应付{0}元", totalMoney);
            Console.WriteLine("以下是您的购物清单");
            foreach (var item in pros)
            {
                Console.WriteLine("货物名称：" + item.Name + "," + "\t" + "货物单价：" + item.Price + "," + "\t" + "货物编号：" + item.ID);
            }
        }
               
        /// <summary>
        /// 根据用户选择的打折方式返回一个打折对象
        /// </summary>
        /// <param name="input">用户的选择</param>
        /// <returns>返回的父类对象 但是里面装的是子类对象</returns>
        public CalFather GetCal(string input)
        {
            CalFather cal = null;
            switch(input)
            {
                case "1": cal = new CalNormal();
                    break;
                case "2": cal = new CalRate(0.9);
                    break;
                case "3": cal = new CalRate(0.85);
                    break;
                case "4": cal = new CalMN(300, 50);
                    break;
                case "5": cal = new CalMN(500, 100);
                    break;
            }
            return cal;
        }
        /// <summary>
        /// 根据用户买的货物计算总价钱
        /// </summary>
        /// <param name="pros"></param>
        /// <returns></returns>
        public double GetMoney(ProductFather[] pros)
        {
            double realMoney = 0;
            for (int i = 0; i < pros.Length; i++)
            {
                realMoney += pros[i].Price;
            }
            return realMoney;
        }

        public void ShwoPros()
        {
            ck.ShowPros();
        }
    }

    /// <summary>
    /// 打折的父类
    /// </summary>
    abstract class CalFather
    {
        /// <summary>
        /// 计算打折后应付多少钱
        /// </summary>
        /// <param name="realMoney">打折前应付的价钱</param>
        /// <returns>打折后应付的钱</returns>
        public abstract double GetTotalMoney(double realMoney);
    }

    class CalNormal : CalFather
    {
        /// <summary>
        /// 不打折
        /// </summary>
        /// <param name="realMoney"></param>
        /// <returns></returns>
        public override double GetTotalMoney(double realMoney)
        {
            return realMoney;
        }
    }

    /// <summary>
    /// rate 折扣率，按折扣率打折
    /// </summary>
    class CalRate : CalFather
    {
        /// <summary>
        /// 折扣率属性
        /// </summary>
        public double Rate
        {
            get;
            set;
        }

        public CalRate(double rate)
        {
            this.Rate = rate;
        }
        public override double GetTotalMoney(double realMoney)
        {
            return realMoney * this.Rate;
        }
    }

    /// <summary>
    /// 买M元送N元
    /// </summary>
    class CalMN : CalFather
    {
        //买500送100
        //买300送50
        /// <summary>
        /// 买的数
        /// </summary>
        public double M
        {
            get;
            set;
        }
        /// <summary>
        /// 送的数
        /// </summary>
        public double N
        {
            get;
            set;
        }

        public CalMN(double m, double n)
        {
            this.M = m;
            this.N = n;
        }
        public override double GetTotalMoney(double realMoney)
        {
            if(realMoney >= this.M)
            {
                return realMoney - (int)(realMoney / this.M) * this.N;
            }
            else
            {
                return realMoney;
            }
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            //创建超市对象
            SupperMarket sm = new SupperMarket();            
            //展示货物
            sm.ShwoPros();
            //跟用户交互
            sm.AskBuying();
            Console.ReadKey();
        }
    }