//激活事件的方法，创建了FireEventArgs 对象，发起事件，并将事件参数对象传递过去
public void ActivateFireAlarm(string room, int ferocity)
{
FireEventArgs fireArgs = new FireEventArgs(room, ferocity);
//执行对象事件处理函数指针，事件触发
FireEvent(this, fireArgs);
}
// 灭火
private void ExtinguishFire(object sender, FireEventArgs fe)
{
int ferocity = fe.ferocity; //得到火情
string room = fe.room;
if (ferocity <= 5)
{
string report = String.Format(@"群众在{0} 发现火情，级别为{1}，群众自行控制住了火势。", room, ferocity);
fireText.AppendText(report + "\n");
}
else
{
string report = String.Format(@"群众在{0} 发现火情，级别为{1}，群众无法控制火势。消防官兵赶来灭火", room, ferocity);
fireText.AppendText(report + "\n");
}
}