windows程序设计c#事件与委托_c#委托执行慢-优快云博客

本文链接：https://blog.youkuaiyun.com/weixin_60687445/article/details/129352563

该文介绍了使用委托和事件来处理信用卡指定储蓄卡还款的设计流程。关键代码展示了一个类`CreditCardDelegate`，它定义了委托和事件，检查储蓄卡余额并触发还款事件。另一个类`Card_event`作为事件订阅者，执行实际的还款操作。文章强调了事件发布与订阅机制在处理这种一对多关系中的作用。

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功能说明:对信用卡指定还款的储蓄卡

设计流程:明确事件,确定参数的传递过程,

传递参数- 检验 -消息通知- 委托事件?执行

建立委托- 添加事件

关键源码展示

class CreditCardDelegate
    {
        public int billamount;
        public int repaymentday;
        //请在此处添加自己的代码
    
            //委托,事件的定义
        public delegate void pay_credit_card(DepositCard depositCard, CreditCard creditCard);

        public event  pay_credit_card Select_pay_depositCard;

        //参数的初始入口、
        public void check(DepositCard depositCard, CreditCard creditCard)
        {
            repaymentday = creditCard.getrepaymentday();
            billamount = creditCard.getbillamount();

            if (depositCard.amount >= Math.Abs(billamount) && repaymentday == DateTime.Today.Day)
            {
                //depositCard.Account(billamount, repaymentday);
                event_notify(depositCard, creditCard);
            }

        }
  
        //起到传输作用
        public void event_notify(DepositCard depositCard, CreditCard creditCard) {
            if (Select_pay_depositCard != null)
            {
                Console.WriteLine("尝试选择卡ing");
                Select_pay_depositCard(depositCard,creditCard);
            }
            else
            {
                Console.WriteLine("暂时没有事件");
            }
        }

      
    }
    //收到消息,执行事件,动作执行者
    class card_envent {
        // 事件订阅器
        //private int billamount;
        //private int repaymentday;
        public void pay_cbill(DepositCard depositCard, CreditCard creditCard)
        {
            int billamount = creditCard.getbillamount();
            int repaymentday = creditCard.getrepaymentday();
            
            try
            {
                
                if (depositCard.amount >= Math.Abs(billamount))
                    depositCard.Account(billamount, repaymentday);
                //else
                //{
                //    throw (Exception("the deposit amount balance is not able to pay the creditcard"));
                //}

            }
            catch
            {
                Console.WriteLine("invalid op");
            }

        }

        private Exception Exception(string v)
        {
            throw new NotImplementedException();
        }
    }

执行结果