public class Cat
{
    //Cat不稳定--这一堆对象--甩锅--自己不写让别人传递
    private List<IObserver> _ObserverList = new List<IObserver>();
    public void AddObserver(IObserver observer)
    {
        this._ObserverList.Add(observer);
　　　　　MiaoHandler += observer.Action;
    }
    public void MiaoObserver()
    {
        Console.WriteLine("{0} MiaoObserver.....", this.GetType().Name);
        if (this._ObserverList != null && this._ObserverList.Count > 0)
        {
            foreach (var item in this._ObserverList)
            {
                item.Action();
            }
        }
    }

    private event Action MiaoHandler;
    public void MiaoEvent()
    {
        Console.WriteLine("{0} MiaoEvent.....", this.GetType().Name);
        if (this.MiaoHandler != null)
        {
            foreach (Action item in this.MiaoHandler.GetInvocationList())
            {
                item.Invoke();
            }
        }
    }
}

 Cat cat = new Cat();
 cat.AddObserver(new Chicken());
 cat.AddObserver(new Baby());
 cat.AddObserver(new Brother());
 cat.AddObserver(new Dog());
 cat.AddObserver(new Father());
 cat.AddObserver(new Mother());
 cat.AddObserver(new Mouse());
 cat.AddObserver(new Neighbor());
 cat.AddObserver(new Stealer());
 cat.MiaoObserver();