C#_delegate和事件 - 如果金额小于0则触发事件

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;//如果账户金额小于0 触发事件namespace Starter
{
public delegate int DeleageteClass(out DateTime start, out DateTime stop); class Program
{
static void Main(string[] args)
{
Bank account = new Bank(); account.NSF += NSFHandler; //绑定账户小于0时候的事件 account.Deposit(500);
account.WithDrawal(750); Console.ReadLine();
} public static void NSFHandler(object o, BankEventArgs e) //如果小于0时候的会发生的事件
{
Console.WriteLine("NSF Transaction");
Console.WriteLine("Balance: "+e.Balance);
Console.WriteLine("Transaction: "+ e.Transaction);
}
} public delegate void OverDrawn(object o,BankEventArgs e); public class Bank { public event OverDrawn NSF; //定义委托事件的属性 public decimal Deposit(decimal amountDeposit)
{
propBalance += amountDeposit;
return propBalance;
} public decimal WithDrawal(decimal amountWithdrawn)
{
decimal newBalance = propBalance - amountWithdrawn;
if (newBalance < 0)
{
if (NSF != null)
{ //BankEventArgs 用于记录当前类相关信息，供事件调用
BankEventArgs args = new BankEventArgs(Balance,amountWithdrawn);
//事件调用 - 方法NSFHandler
NSF(this, args);
}
}
return propBalance = newBalance; } private decimal propBalance=0; public decimal Balance
{
get
{
return propBalance;
}
}
} public class BankEventArgs : EventArgs
{
public BankEventArgs(decimal amountBalance,decimal amountTransaction)
{
propTransaction = amountTransaction;
propBalance = amountBalance;
} private decimal propBalance; public decimal Balance
{
get {
return propBalance;
}
} private decimal propTransaction; public decimal Transaction
{
get
{
return propTransaction;
}
}
}
}