c#学习笔记2-委托

佚名 6年前 (2019-05-14) 随笔 1784人围观抢沙发百度已收录

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


namespace Demo
{
    class Demo9
    {
        //static void Main(string[] args)
        //{
            
        //    A a = new A(); 
        //    B b = new B(a); 
        //    C c = new C(a); 
        //    a.Fall();
        //    Console.ReadLine();
          
        //}
    }

    /// <summary>
    /// 首领A举杯委托
    /// </summary>
    /// <param name="hand">手：左、右</param>
    public delegate void RaiseEventHandler(string hand);
    /// <summary>
    /// 首领A摔杯委托
    /// </summary>
    public delegate void FallEventHandler();
    /// <summary>
    /// 首领A
    /// </summary>
    public class A
    {
        /// <summary>
        /// 首领A举杯事件
        /// </summary>
        public event RaiseEventHandler RaiseEvent;
        /// <summary>
        /// 首领A摔杯事件
        /// </summary>
        public event FallEventHandler FallEvent;

        /// <summary>
        /// 举杯
        /// </summary>
        /// <param name="hand">手：左、右</param>
        public void Raise(string hand)
        {
            Console.WriteLine("A{0} is ready", hand);
            // 调用举杯事件，传入左或右手作为参数
            if (RaiseEvent != null)
            {
                RaiseEvent(hand);
            }
        }
        /// <summary>
        /// 摔杯
        /// </summary>
        public void Fall()
        {
            Console.WriteLine("A is goods");
            // 调用摔杯事件
            if (FallEvent != null)
            {
                FallEvent();
            }
        }
    }
    /// <summary>
    /// 部下B
    /// </summary>
    public class B
    {
        A a;

        public B(A a)
        {
            this.a = a;
            a.RaiseEvent += new RaiseEventHandler(a_RaiseEvent); // 订阅举杯事件
            a.FallEvent += new FallEventHandler(a_FallEvent); // 订阅摔杯事件
        }
        /// <summary>
        /// 首领举杯时的动作
        /// </summary>
        /// <param name="hand">若首领A左手举杯，则B攻击</param>
        void a_RaiseEvent(string hand)
        {
            if (hand.Equals("left"))
            {
                Attack();
            }
        }

        /// <summary>
        /// 首领摔杯时的动作
        /// </summary>
        void a_FallEvent()
        {
            Attack();
        }

        /// <summary>
        /// 攻击
        /// </summary>
        public void Attack()
        {
            Console.WriteLine("b attack");
        }
    }
    /// <summary>
    /// 部下C
    /// </summary>
    public class C
    {
        A a;
        public C(A a)
        {
            this.a = a;
            a.RaiseEvent += new RaiseEventHandler(a_RaiseEvent); // 订阅举杯事件
            a.FallEvent += new FallEventHandler(a_FallEvent); // 订阅摔杯事件
        }
        /// <summary>
        /// 首领举杯时的动作
        /// </summary>
        /// <param name="hand">若首领A右手举杯，则攻击</param>
        void a_RaiseEvent(string hand)
        {
            if (hand.Equals("right"))
            {
                Attack();
            }
        }

        /// <summary>
        /// 首领摔杯时的动作
        /// </summary>
        void a_FallEvent()
        {
            Attack();
        }
        /// <summary>
        /// 攻击
        /// </summary>
        public void Attack()
        {
            Console.WriteLine("c attack");
        }
    }
}