static void Main(string[] args)
{
Secretary tongzijie = new Secretary();
StockObserver tongshi1 = new StockObserver("张三", tongzijie);
StockObserver tongshi2 = new StockObserver("李四", tongzijie);
tongzijie.Attach(tongshi1);
tongzijie.Attach(tongshi2);
tongzijie.SecretaryAction = "老板回来了！";
tongzijie.Notify();
Console.ReadLine();
}
public StockObserver(string name, Secretary sec)
{
this._name = name;
this.sub = sec;
}