public void BoilWater()//烧水
{
for (int i = 0; i <= 99; i++)
{
temprature = i + 1;
if (temprature > 97)//当水快烧开时(温度>97度)，通知Observer
{
BoiledEventArgs e = new BoiledEventArgs(temprature, type, area);
OnBoiled(e);
}
}
}
private bool isDisplayedType = false;//标记变量，标示是否已经打印过
public void Update(BoiledEventArgs e)
{
if (!isDisplayedType)
{
Console.WriteLine("{0}-{1}:", e.Area, e.Type);
Console.WriteLine();
isDisplayedType = true;
}
if (e.Temperature < 100)
{
Console.WriteLine(string.Format("Alarm".PadRight(7) + ":水快烧开了，当前温度:{0}。", e.Temperature));
}
else
{
Console.WriteLine(string.Format("Alarm".PadRight(7) + ":水已经烧开了！！"));
}
}
//供子类覆盖，以便子类拒绝被通知，或添加额外行为
protected virtual void OnBoiled(BoiledEventArgs e)
{
base.Notify(e);//调用父类Notify方法，进而调用所有祖册了Observer的Update方法
}