public static void ShowMsg(Object sender, Heater.BoiledEventArgs e)
{ //静态方法
Heater heater = (Heater)sender; //这里是不是很熟悉呢？
Trace.WriteLine(string.Format("Display：{0} - {1}: ", heater.area, heater.type)); //访问 sender 中的公共字段
Trace.WriteLine(string.Format("Display：水快开了，当前温度：{0}度。", e.temperature));
}
// 发出语音警报
public void MakeAlert(Object sender, Heater.BoiledEventArgs e)
{
Heater heater = (Heater)sender; //这里是不是很熟悉呢？
Trace.WriteLine(string.Format("Alarm：{0} - {1}: ", heater.area, heater.type)); //访问 sender 中的公共字段
Trace.WriteLine(string.Format("Alarm：嘀嘀嘀，水已经 {0} 度了。", e.temperature));
}