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