日期:2014-05-17 浏览次数:20918 次
using System;
using System.Collections.Generic;
using System.Text;
namespace Delegate
{
// 热水器
public class Heater
{
private int temperature;
public string type = "RealFire 001"; // 添加型号作为演示
public string area = "China Xian"; // 添加产地作为演示
//声明委托
public delegate void BoiledEventHandler(Object sender, BoiledEventArgs e);
public event BoiledEventHandler Boiled; //声明事件
// 定义BoiledEventArgs类,传递给Observer所感兴趣的信息
public class BoiledEventArgs : EventArgs //??????????????????????????????????????为何要继承这个class
{
public readonly int temperature;
public BoiledEventArgs(int temperature)
{
this.temperature = temperature;
}
}
// 可以供继承自 Heater 的类重写,以便继承类拒绝其他对象对它的监视
protected virtual void OnBoiled(BoiledEventArgs e)
{
if (Boiled != null)
{ // 如果有对象注册
Boiled(this, e); // 调用所有注册对象的方法
}
}
// 烧水。
public void BoilWater()
{
for (int i = 0; i <= 100; i++)
{
temperature = i;
if (temperature > 95)
{
//建立BoiledEventArgs 对象。
&nb