Windows课程作业C#实现银行卡还款

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为了熟悉C#的委托与事件，用委托与事件实现简单的银行卡与储蓄卡的还款功能

前言

信用卡还款是银行系统的重要业务，业务流程说明如下：

用户有信用卡和储蓄卡，储蓄卡有查询余额和取款功能，信用卡能够查看账单金额、查看还款日和查看余额三个功能；
请使用委托与事件实现下列功能：用户可自由设置信用卡还款关联的储蓄卡，当还款日到期时进行账单金额的自动划扣；
请注意事件主要是设计什么时候启动委托，委托的主要目的是设置还款的储蓄卡
为避免设计出现偏差，给出了部分功能代码，请在此基础上进行开发。

一、基本框架

namespace ConsoleApplication3delegate{class DepositCard{public int amount;public void Display(){Console.WriteLine("储蓄卡余额为：{0}", amount);}public void Account(int balance,int payday){amount += balance;Console.WriteLine("今天是本月的｛0｝，取款｛1｝，储蓄卡余额为：{2}。", DateTime.Today.Day,balance,amount);}}class CreditCard{private int billamount;private int repaymentday;public CreditCard(int billamount, int repaymentday){this.billamount = billamount;this.repaymentday = repaymentday;}public int getbillamount() {return billamount;}public int getrepaymentday() { return repaymentday;}public void Display(){Console.WriteLine("信用卡余额为：{0}", billamount);}}class CreditCardDelegate{public int billamount;public int repaymentday;//请在此处添加自己的代码}class Program{static void Main(string[] args){DepositCard depositCard = new DepositCard();depositCard.amount = 10000;CreditCard creditCard1 = new CreditCard(-2000,9);CreditCard creditCard2 = new CreditCard(-3000, 13);CreditCard creditCard3 = new CreditCard(-5000, 29);depositCard.Display(); Console.WriteLine("");List<CreditCard> Cards = new List<CreditCard>();Cards.Add(creditCard1); Cards.Add(creditCard2); Cards.Add(creditCard3);foreach (CreditCard card in Cards){Console.WriteLine("信用卡开始执行委托还款。。。。。。");//请在此处添加自己的代码Console.WriteLine("");}Console.ReadLine();}}}

二、具体部分实现

1.实现委托与事件

由于题目要求，可知这个委托主要应该是对储蓄卡的操作，获取储蓄卡相关信息的方法为account它的形参为（int，int）所以将委托也设置为（int，int）便于添加。

代码如下：

public delegate void Carddelegate(int c, int d1);

public class CreditCardDelegate{public int billamount;public int repaymentday;public event Carddelegate Orderhandle;public void action(int balance,int payday){if (Orderhandle != null){Orderhandle(balance,payday);}}//请在此处添加自己的代码}

2.功能实现

代码如下：

Timer t = new Timer();
int date = DateTime.Today.Day;
int date1 = DateTime.Today.Month;
int[] monthday = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };//设置时间
//其实感觉有点多余对于这个例子，可以只取这个月

    CreditCardDelegate Corder = new CreditCardDelegate();//创建委托Corder.Orderhandle += depositCard.Account;//将储蓄卡的方法添加进去   foreach (CreditCard card in Cards)//遍历每一张卡{for (int i = 1; i <= monthday[date1]; i++){//循环是遍历每个月的最大天数到期还款if (date==card.getrepaymentday() ){//当满足需要还款的时间时执行还款Console.WriteLine("信用卡开始执行委托还款。。。。。。");Corder.action(card.getbillamount(), date);date++;//执行完过一天break;}else{t.Interval = 1000;date++;//不到还款日}//请在此处添加自己的代码}Console.WriteLine("");}Console.ReadLine();

3.完整代码和结果

代码如下：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Web;
using System.Timers;
namespace ConsoleApplication3delegate
{public class DepositCard{public int amount;public void Display(){Console.WriteLine("储蓄卡余额为：{0}", amount);}public void Account(int balance, int payday){amount += balance;Console.WriteLine("今天是本月的第{0}天，取款{1}，储蓄卡余额为：{2}。", payday, balance, amount);}}public class CreditCard{private int billamount;private int repaymentday;public CreditCard(int billamount, int repaymentday){this.billamount = billamount;this.repaymentday = repaymentday;}public int getbillamount() { return billamount; }public int getrepaymentday() { return repaymentday; }public void Display() { Console.WriteLine("信用卡余额为：{0}", billamount); }}public delegate void Carddelegate(int c, int d1);public class CreditCardDelegate{public int billamount;public int repaymentday;public event Carddelegate Orderhandle;public void action(int balance,int payday){if (Orderhandle != null){Orderhandle(balance,payday);}}//请在此处添加自己的代码}class Program{static void Main(string[] args){DepositCard depositCard = new DepositCard();depositCard.amount = 10000;CreditCard creditCard1 = new CreditCard(-2000, 9);CreditCard creditCard2 = new CreditCard(-3000, 13);CreditCard creditCard3 = new CreditCard(-5000, 29);depositCard.Display(); Console.WriteLine("");List<CreditCard> Cards = new List<CreditCard>();Cards.Add(creditCard1); Cards.Add(creditCard2); Cards.Add(creditCard3);Timer t = new Timer();int date = DateTime.Today.Day;int date1 = DateTime.Today.Month;int[] monthday = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };CreditCardDelegate Corder = new CreditCardDelegate();Corder.Orderhandle += depositCard.Account;foreach (CreditCard card in Cards){for (int i = 1; i <= monthday[date1]; i++){if (date==card.getrepaymentday() ){Console.WriteLine("信用卡开始执行委托还款。。。。。。");Corder.action(card.getbillamount(), date);date++;break;}else{t.Interval = 1000;date++;}//请在此处添加自己的代码}Console.WriteLine("");}Console.ReadLine();}}
}