求助：能帮忙看看我这个代码吗，有更好的方式吗？

    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("请依次按提示输入：");
            Console.WriteLine("输入购买金额：");
            var inputMoney = double.Parse(Console.ReadLine());
            Console.WriteLine("输入购买数量：");
            var inputNumbers = int.Parse(Console.ReadLine());
            Console.WriteLine("@输入是否是会员：    0：非会员；    1：银卡会员；    2：金卡会员；");
            var inputVip = int.Parse(Console.ReadLine());
            var Person1 = new CashContext(inputMoney, inputNumbers,inputVip);

            Console.ReadLine();
        }
    }
    //现金收取父类
    internal abstract class CashReap
    {
        public abstract double AcceptCash(double money);
    }
    //正常收费子类
    internal class CashNormal : CashReap
    {
        public override double AcceptCash(double money)
        {
            return money;
        }
    }
    //打折子类
    internal class CashDiscount : CashReap
    {
        private double _moneyDiscount = 1d;
        public int ProductNumbers { get; set; }

        public CashDiscount(double moneyDiscount)
        {
            _moneyDiscount = moneyDiscount;
        }

        public override double AcceptCash(double money)
        {
            return money*_moneyDiscount;
        }
    }
    //返现子类
    internal class CashRebate : CashReap
    {
        private double _moneyCondition = 0.0d;
        private double _moneyReturn = 0.0d;
        public CashRebate(double moneyCondition, double moneyReturn)
        {
            _moneyCondition = moneyCondition;
            _moneyReturn = moneyReturn;
        }
        public float TotalPrices { get; set; } 

        public override double AcceptCash(double money)
        {
            double result = money;
            if (money >= _moneyCondition)
            {
                result = money - _moneyReturn;
            }
            return result;
        }
    }
    //VIP类
    internal class VipDiscount : CashReap
    {
        private double _moneyDiscount = 1d;
        public VipDiscount(double discountRate)
        {
            _moneyDiscount = discountRate;
        }

        public override double AcceptCash(double money) 
 
        {
            return money * _moneyDiscount;
        }
    }

    //现金收取工厂
    internal class CashContext
    {
        private CashReap _cReap;

        public CashContext(double totalMoney,int productnumbers,int isVip)
        {
            //购买数量的判断
            if (productnumbers == 1)
            {
                var cs1 = new CashDiscount(0.9);
                _cReap = cs1;
            }
            else if (productnumbers >= 2)
            {
                var cs2 = new CashDiscount(0.7);
                _cReap = cs2;
            }

            var temp1 = _cReap.AcceptCash(totalMoney);
            //购买金额的判断
            if (temp1 >= 100 && temp1 < 200)
            {
                var cs1 = new CashRebate(100, 10);
                _cReap = cs1;
            }
            if (temp1 >= 200 && temp1 < 300)
            {
                var cs2 = new CashRebate(200, 20);
                _cReap = cs2;
            }
            if (temp1 >= 300)
            {
                var cs3 = new CashRebate(300, 50);
                _cReap = cs3;
            }

            var temp2 = _cReap.AcceptCash(totalMoney);
            //VIP的判断
            switch (isVip)
            {
                case 0:
                    var cs1 = new VipDiscount(1);
                    _cReap = cs1;
                    break;
                case 1:
                    var cs2 = new VipDiscount(0.9);
                    _cReap = cs2;
                    break;
                case 2:
                    var cs3 = new VipDiscount(0.8);
                    _cReap = cs3;
                    break;
            } 
 
            Console.WriteLine("应付总额为： "+GetResult(temp2)+" 元");
        }

        public double GetResult(double money)
        {
            return _cReap.AcceptCash(money);
        }
    }

请问这里的if else可以换为更简便的写法嘛？这代码有什么问题没有啊，刚学完策略模式+工程模式；要运用OOP思想
[解决办法]
建议按以下结构设计代码：

class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("请依次按提示输入：");
            Console.WriteLine("输入购买金额：");
            var inputMoney = double.Parse(Console.ReadLine());
            Console.WriteLine("输入购买数量：");
            var inputNumbers = int.Parse(Console.ReadLine());
            Console.WriteLine("@输入是否是会员：    0：非会员；    1：银卡会员；    2：金卡会员；");
            var inputVip = int.Parse(Console.ReadLine());
            var Person1 = new CashContext(inputMoney, inputNumbers,inputVip);
 
            Console.ReadLine();
        }
    }
    
    //现金收取父类
    internal abstract class CashReap
    {
        public abstract double AcceptCash(double money);
    }
    
    //打折子类
    internal class CashDiscount : CashReap
    { 
        ......
        public int ProductNumbers { get; set; }      // 此处需要增加根据数量自动换算折扣率的代码
        ......
    }
    
    //返现子类
    internal class CashRebate : CashReap
    {
 
        ......
        public float TotalPrices { get; set; }      // 此处需要增加根据总金额自动换算返还金额的算法 
        ......
    }
    //VIP类
    internal class VipDiscount : CashReap
    {
      ......
    }
 
    //现金收取工厂
    internal class CashContext
    {
        private CashReap _cReap;
 
        public CashContext(double totalMoney,int productnumbers,int isVip)
        {
            // 活支折扣
            CashDiscount cs1 = new CashDiscount();
            cs1.productnumbers == 1;  
            totalMoney = cs1.AcceptCash(totalMoney);
            
            // VIP折扣
            VipDiscount cs2 = new VipDiscount(isVip);
            totalMoney = cs2.AcceptCash(totalMoney);            
 
            
            // 返现
            CashRebater cs3 = new CashRebate();
            totalMoney = cs3.AcceptCash(totalMoney)
 
            Console.WriteLine("应付总额为： "+ totalMoney.tostring() +" 元");
        }
 
    }