理解C#中的委托与事件

前段日子，在学习C#中委托与事件，理解得不是很清楚，直到在园子里看到一篇博客，用了热水器的一件例子讲解委托与事件，才让我恍然大悟。

然后就利用委托与事件写了一个两人互聊的小程序。

代码如下：

 

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

namespace Chat
{
    class ChatEventArgs:EventArgs
    {
        public string ChatMsg;

        public ChatEventArgs(string msg) 
        {
            ChatMsg=msg;
        }
    }
    
    class Chater
    {
        public string name;
        public delegate void ChatEventHandler(object sender, ChatEventArgs e);
        public event ChatEventHandler Chat;

        public static Queue MsgQueue;

        public Chater(string name)
        {
            this.name = name;
            if (MsgQueue == null)
                MsgQueue = new Queue();
        }

        private void OnChat(ChatEventArgs e)
        {
            if (Chat != null)
                Chat(this, e);
        }

        private void ShowAllMsg()
        {
            Console.Clear();
            foreach (string msg in MsgQueue)
                Console.WriteLine(msg);
            Console.WriteLine("----------------------------");
        }

        private void ChatMsgQueue(string name, string msg)
        {
            if (MsgQueue.Count >= 12)
            {
                MsgQueue.Dequeue();
                MsgQueue.Dequeue();
            }
            MsgQueue.Enqueue(name + ":");
            MsgQueue.Enqueue("  " + msg);
            ShowAllMsg();
        }

        public void Chatting(object sender, ChatEventArgs e)
        {
            string name = ((Chater)sender).name;
            ChatMsgQueue(name, e.ChatMsg);
            Console.Write("{0} says \"{1}\" to you, what do you want to reply: ", name, e.ChatMsg);        
            string replysContent = Console.ReadLine();
            if (replysContent != "exit" && replysContent != "I'm tired!")
            {
                ChatEventArgs replys = new ChatEventArgs(replysContent);
                OnChat(replys);
            }
            else
                return;
        }


        public void StartChat()
        {
            Console.WriteLine("Okay, let's starting chatting!");
            Console.WriteLine("My name is {0}, I get starting!",name);
            string start = Console.ReadLine();
            if (start != "exit" && start != "I'm tired!")
            {
                ChatEventArgs startMsg = new ChatEventArgs(start);
                OnChat(startMsg);
            }
            else
                return;
        }
    }
    
    class Program
    {
        static void Main(string[] args)
        {
            Chater PersonA = new Chater("Jobs");
            Chater PersonB = new Chater("Eric");

            PersonA.Chat += PersonB.Chatting;
            PersonB.Chat += PersonA.Chatting;

            PersonA.StartChat();
        }
    }
}

 

 

程序运行结果：

转载于:https://www.cnblogs.com/baurine/archive/2011/01/02/1924070.html