//Main方法是整个软件程序的入口
static void Main(string[] args)
{
//激活并触发事件
new SystemEvent().EventTrigger();
return;
EventIntroduction e = new EventIntroduction();
RegistedEvent r = new RegistedEvent(e);
e.TrigEvent(e);
//值类型
int x = 42;
//引用类型
string str = "hello world";
Console.WriteLine("值类型：{0} \n\t 引用类型：{1}",
x, str);
}
public RegistedEvent(EventIntroduction ei)
{
ei.changed += E_change;
}