接口实现观察者模式

using System.Text;
using System.Collections.Generic;
using System.Linq;
using System;

namespace 观察者
{
    public interface IServer
    {
  void Notice( IClient C);
    }

    public interface IClient
    {
  void Show();
    }

 public class Person : IClient
 {
  public Person( IServer S )
  {
           S.Notice(this);
  }
  public void Show()
  {
   Console.WriteLine("主人被惊醒了");
  }
 }

 public class Mouses : IClient
 {
  public Nouses( IServer C )
  {
   C.Notice( this );
  }
  public void Show()
  {
   Console.WriteLine("老鼠被吓跑了");
  }
 }

    public class Tom : IServer
    {
  ArrayList al =new ArrayList();
  public void Notice(IClient C)
  {
   al.Add( C );
  }

  public void Runs()
  {
   Console.WriteLine("猫叫了");
   foreach (IClient item in al)
   {
    item.Show();
   }
  }
    }
    
 class Test
 {
  static void Main(string[] args)
  {
   Tom t=new Tom();
   Person p=new Person(t);
   Mouses m =new Mouses(t);
   t.Runs();
  }
 }
}