1.问题分析
定义各类使用c#委托与事件实现定时自动从用户的信用卡中扣款还款的功能
2.源代码
定义一个Delegate类，定义事件与委托并绑定
class Delegate
{
public delegate void MyDelegate(User user);
public event MyDelegate Remind_event;
public event MyDelegate Deduct_event;
public void MyRemind(User user)
{
if (Remind_event != null)
Remind_event(user);
}
public void MyDeduct(User user)
{
if (Deduct_event != null)
Deduct_event(user);
}
}
定义一个Operation类，定义还款日期，欠款数，卡内余额
class Operation
{
public void Record()
{
DateTime DateTime1, DateTime2 = DateTime.Now;
DateTime1 = Convert.ToDateTime("2021 - 04 - 15");
string dateDiff = null;
TimeSpan ts1 = new TimeSpan(DateTime1.Ticks);
TimeSpan ts2 = new TimeSpan(DateTime2.Ticks);
TimeSpan ts = ts1.Subtract(ts2).Duration();
dateDiff = ts.Days.ToString() + "天";
Console.WriteLine("距离还款时间还有：{0}", dateDiff);
}
public void Remind_func(User user)
{
Console.WriteLine("亲爱的{0}用户,您的还款日期即将到临，本次需还款{1}元！", user.Name, user.Debt);
Record();
Console.ReadLine();
}
public void Deduct_func(User user)
{
Console.WriteLine("亲爱的{ 0}用户,您的信用卡原余额为{1}元", user.Name, user.Deposit);
Console.WriteLine("本次还清账单{ 0}元，信用卡目前余额为{1}元！", user.Debt, user.Deposit - user.Debt);
Console.WriteLine();
}
}
主程序
static void Main(string[] args)
{
Delegate obj1 = new Delegate();
Delegate obj2 = new Delegate();
User u1 = new User("王五", 4000, 300, 10);
User u2 = new User("张三", 10000, 2000, 20);
Operation operate = new Operation();
obj1.Remind_event += operate.Remind_func;
obj2.Deduct_event += operate.Deduct_func;
for (int day = 0; day <= 30; day++)
{
if (u1.Date - day == 3)
obj1.MyRemind(u1);
if (u2.Date - day == 3)
obj1.MyRemind(u2);
if (day == u1.Date)
{
Console.WriteLine("还款日期已到！");
obj2.MyDeduct(u1);
}
if (day == u2.Date)
{
Console.WriteLine("还款日期已到！");
obj2.MyDeduct(u2);
}
}
}
}
3.实验截图
4.实验心得 在此次实验中，我对委托的用法有了进一步的了解，但也还有很多不足去完善。
5.Gitee源码
