【Day2】使用C#委托事件实现信用卡用户定时还款功能

问题分析

1. 使用C#的委托功能
2. 拥有信用卡类、储蓄卡类、还款委托类
3. 信用卡类将绑定储蓄卡类，若信用卡需要还款，则从储蓄卡里取
4. 还款则可以视为事件

代码实现

储蓄卡类

    //储蓄卡类
    class depositCard
    {
        //储蓄名
        private string name;
        //储蓄金额
        private int depositMoney;
        //基础储蓄金额
        public depositCard(string name, int money)
        {
            this.name = name;
            this.depositMoney = money;
        }
        //获取储蓄金额
        public int getDepositMoney()
        {
            return this.depositMoney;
        }
        public void setDepositMoney(int r)
        {
            this.depositMoney = r;
        }
    }

信用卡类

    //信用卡类
    class creditCard
    {
        //信用卡持有者名称
        public string name;
        //信用卡余额
        public int creditMoney;
        //扣款日期
        public int dueDay;
        //绑定储蓄卡对象
        public depositCard DC;
        //初始化
        public creditCard(string name, int CM, int DD, depositCard DC)
        {
            this.name = name;
            this.creditMoney = CM;
            this.dueDay = DD;
            this.DC = DC;
        }
        //还款
        public void repayM()
        {
            Console.WriteLine("用户{0}当前金额{1}",this.name, this.DC.getDepositMoney());
            DC.setDepositMoney(this.DC.getDepositMoney() + creditMoney);
            Console.WriteLine("用户已还款");
            Console.WriteLine("还款金额:{0}", Math.Abs(this.creditMoney));
            Console.WriteLine("余下金额为{0}", DC.getDepositMoney());
            Console.WriteLine();
        }
        //无需还款
        public void norepayM()
        {
            Console.WriteLine("用户{0}当前金额{1}", this.name, this.DC.getDepositMoney());
            Console.WriteLine("用户未到还款日期，无需还款", this.name);
            Console.WriteLine();
        }
    }

扣款委托类

    //扣款委托类
    class repayDelegate
    {
        //扣款委托
        public delegate void repayMoney();
        //扣款事件
        public event repayMoney DoRepay;
        //事件执行
        public void NotifyRepay()
        {
            if (DoRepay != null)
            {
                Console.WriteLine("触发事件：");
                // 触发事件
                DoRepay();
            }
        }
    }

主程序入口

 class Program
    {
        static void Main(string[] args)
        {
            //初始化数据
            depositCard D1 = new depositCard("张三", 10000);
            depositCard D2 = new depositCard("李四", 10000);
            depositCard D3 = new depositCard("王五", 10000);

            creditCard C1 = new creditCard("张三", -5000, 31, D1);
            creditCard C2 = new creditCard("李四", -3000, 31, D2);
            creditCard C3 = new creditCard("王五", -1000, 20, D3);
            List<creditCard> cCards = new List<creditCard>();
            cCards.Add(C1);
            cCards.Add(C2);
            cCards.Add(C3);
            //创建委托对象
            repayDelegate rD = new repayDelegate();

            foreach (creditCard C in cCards)
            {
                //判断是否到了该还款的日期
                if (C.dueDay == int.Parse(DateTime.Now.ToString("yyyy-MM-dd").Split('-')[2]))
                {
                    //事件添加
                    rD.DoRepay += new repayDelegate.repayMoney(C.repayM);
                }
                else
                {
                    rD.DoRepay += new repayDelegate.repayMoney(C.norepayM);
                }
            }
            //事件执行
            rD.NotifyRepay();
        }
    }
}

结果样例

仓库地址

https://gitee.com/lazy_lazy_tang_lan/my-programming