事件 委托 老鼠 猫 主人

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

namespace TheStoryOfCat
{
    class Program
    {
        static void Main(string[] args)
        {
            Cat cat = new Cat() { Name = "Petal" };
            Mouse mouse = new Mouse() { Name = "Jack" };
            cat.CatMonitorEvent += cat.Move;
            cat.CatMonitorEvent += mouse.Move;
            //主人
            Master master = new Master(cat) {  Name="Old Boss"};
            cat.Run();
            Console.ReadKey();
        }
    }

    public delegate void MonitorHandle();
    public class Cat
    {
        public string Name;

        public event MonitorHandle CatMonitorEvent;

        public Cat() { 
        }
        
        public void Move()
        {
            Console.WriteLine("Cat:" +this.Name +"Moving");
           
        }
        public void Run()
        {
            if (CatMonitorEvent != null)
                CatMonitorEvent();
        }
    }
    public class Mouse
    {
        public string Name;

        public Mouse() { 
        }

        public void Move()
        {
            Console.WriteLine("Mouse: "+this.Name + "Moving");
        }
    }

    public class Master
    {
        public string Name;

        /// <summary>
        /// 注入
        /// </summary>
        /// <param name="cat"></param>
        public Master(Cat cat)
        {
            if (cat != null)
                cat.CatMonitorEvent += Move;
        }
        public void Move()
        {
            Console.WriteLine("Master: " + this.Name + "Moving");
        }
    }
}

写法二：

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


namespace TheStoryOfCat
{
    
    class Program
    {
        static void Main(string[] args)
        {
            Cat cat = new Cat() { Name = "Petal" };
            Mouse mouse = new Mouse() { Name = "Jack" };
            cat.CatMonitorEvent += cat.Move;
           
            cat.CatMonitorEvent += mouse.Move;
            //主人
            Master master = new Master(cat) {  Name="Old Boss"};
            cat.Run(new MonitorEventArgs(20));
            Console.WriteLine("----------华丽分割线-------------");
            cat.Run(new MonitorEventArgs(70));
            Console.ReadKey();
        }
    }
    public class MonitorEventArgs : EventArgs
    {
        public int Sound;
        public MonitorEventArgs(int _Sound) {
            this.Sound = _Sound;
        }
    }

    public delegate void MonitorHandle(object obj,MonitorEventArgs arg);
    /// <summary>
    /// 猫
    /// </summary>
    public class Cat
    {
        public string Name;

        public event MonitorHandle CatMonitorEvent;

        public Cat() { 
        }

        public void Move(object obj, MonitorEventArgs arg)
        {
            Console.WriteLine( " {0} 当前叫声{1}分贝",this.Name,arg.Sound);
        }
        public virtual void Run(MonitorEventArgs arg )
        {
            if (CatMonitorEvent != null)
                CatMonitorEvent(this, arg);
        }
    }
    /// <summary>
    /// 老鼠
    /// </summary>
    public class Mouse
    {
        public string Name;

        public Mouse() { 
        }
        /// <summary>
        /// 猫叫声如果低于50分贝 则不预计较
        /// </summary>
        /// <param name="obj"></param>
        /// <param name="arg"></param>
        public void Move(object obj, MonitorEventArgs arg)
        {
            if (arg == null)
                return;
            string result = "不预计较";
            if (arg.Sound > 50)
                result = "快跑";
            Console.WriteLine(" {0}听见，猫当前叫声{1}分贝,{2}", this.Name, arg.Sound,result);
        }
    }
    /// <summary>
    /// 主人
    /// </summary>
    public class Master
    {
        public string Name;

        /// <summary>
        /// 注入
        /// </summary>
        /// <param name="cat"></param>
        public Master(Cat cat)
        {
            if (cat != null)
                cat.CatMonitorEvent += Move;
        }
        public void Move(object obj, MonitorEventArgs arg)
        {
            if (arg == null)
                return;
            string result = "猫中气不足";
            if (arg.Sound > 50)
                result = "猫状态不错";
            Console.WriteLine(" 主人{0},听见猫当前叫声{1}分贝,{2}", this.Name, arg.Sound, result);
        }
    }
}