c# socket 异步通信，一个服务器端和多个客户端

一个服务器端和多个客户端的Socket通信。启动服务端后，服务端通过持续监听客户端发来的请求，一旦监听到客户端传来的信息后，两端便可以互发信息了。服务器端需要绑定一个IP和端口号，用于客户端在网络中寻找并建立连接。信息发送原理：将手动输入字符串信息转换成机器可以识别的字节数组，然后调用套接字的Send()方法将字节数组发送出去。信息接收原理：调用套接字的Receive()方法，获取对端传来的字节数组,然后将其转换成人可以读懂的字符串信息。

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Net;
using System.Net.Sockets;


namespace SocketClient
{
    public partial class FormClient : Form
    {
        Socket client;
        public FormClient（）
        {
            InitializeComponent（）;
        }
        private void button1_Click（object sender EventArgs e）
        {
            AsyncConnect（）;
        }

        /// 

        /// 连接到服务器
        /// 

        public void AsyncConnect（）
        {
            try
            {
                //端口及IP
                IPEndPoint ipe = new IPEndPoint（IPAddress.Parse（textBox_ip.Text） int.Parse（textBox_port.Text））;
                //创建套接字
                client = new Socket（AddressFamily.InterNetwork SocketType.Stream ProtocolType.Tcp）;
                //开始连接到服务器
                client.BeginConnect（ipe asyncResult =>
                {
                    client.EndConnect（asyncResult）;
                    //向服务器发送消息
                    AsyncSend（client “你好我是客户端“）;
                    //接受消息
                    AsyncReceive（client）;
                } null）;
            }
            catch （Exception ex）
            {

            }


        }

        /// 

        /// 发送消息
        /// 

        /// 
        /// 
        public void AsyncSend（Socket socket string message）
        {
            if （socket == null || message == string.Empty） return;
            //编码
            byte[] data = Encoding.UTF8.GetBytes（message）;
            try
            {

                socket.BeginSend（data 0 data.Length SocketFlags.None asyncResult =>
                {
                    //完成发送消息
                    int length = socket.EndSend（asyncResult）;
                } null）;
            }
            catch （Exception ex）
            {
            }
        }

        /// 

        /// 接收消息
        /// 

        /// 
        public void AsyncReceive（Socket socket）
        {
            byte[] data = new byte[1024];
            try
            {

                //开始接收数据
                socket.BeginReceive（data 0 data.Length SocketFlags.None
                asyncResult =>
                {
                    try
                    {
                        int length = socket.EndReceive（asyncResult）;
                        setText（Encoding.UTF8.GetString（data））;
                    }
                    catch （Exception）
                    {
                        AsyncReceive（socket）;
                    }


                    AsyncReceive（socket）;
                } null）;
            }
            catch （Exception ex）
            {
   

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2017-10-31 16:53  SocketTest\
     目录           0  2017-10-17 09:07  SocketTest\SocketClient\
     目录           0  2017-10-12 17:24  SocketTest\SocketClient\bin\
     目录           0  2017-10-31 16:53  SocketTest\SocketClient\bin\Debug\
     文件       11776  2017-10-19 21:23  SocketTest\SocketClient\bin\Debug\SocketClient.exe
     文件       26112  2017-10-19 21:23  SocketTest\SocketClient\bin\Debug\SocketClient.pdb
     文件       11600  2017-10-16 14:36  SocketTest\SocketClient\bin\Debug\SocketClient.vshost.exe
     文件         490  2016-07-16 19:44  SocketTest\SocketClient\bin\Debug\SocketClient.vshost.exe.manifest
     目录           0  2017-10-12 17:24  SocketTest\SocketClient\bin\Release\
     文件        3596  2017-10-19 21:22  SocketTest\SocketClient\FormClient.cs
     文件        5892  2017-10-19 17:39  SocketTest\SocketClient\FormClient.Designer.cs
     文件        5817  2017-10-19 17:39  SocketTest\SocketClient\FormClient.resx
     目录           0  2017-10-12 17:24  SocketTest\SocketClient\obj\
     目录           0  2017-10-12 17:24  SocketTest\SocketClient\obj\x86\
     目录           0  2017-10-19 21:23  SocketTest\SocketClient\obj\x86\Debug\
     文件        5420  2017-10-17 08:19  SocketTest\SocketClient\obj\x86\Debug\DesignTimeResolveAssemblyReferences.cache
     文件        6341  2017-10-19 21:23  SocketTest\SocketClient\obj\x86\Debug\DesignTimeResolveAssemblyReferencesInput.cache
     文件         656  2017-10-19 21:23  SocketTest\SocketClient\obj\x86\Debug\SocketClient.csproj.FileListAbsolute.txt
     文件         980  2017-10-19 21:23  SocketTest\SocketClient\obj\x86\Debug\SocketClient.csproj.GenerateResource.Cache
     文件       11776  2017-10-19 21:23  SocketTest\SocketClient\obj\x86\Debug\SocketClient.exe
     文件         180  2017-10-19 21:23  SocketTest\SocketClient\obj\x86\Debug\SocketClient.FormClient.resources
     文件       26112  2017-10-19 21:23  SocketTest\SocketClient\obj\x86\Debug\SocketClient.pdb
     文件         180  2017-10-19 21:23  SocketTest\SocketClient\obj\x86\Debug\SocketClient.Properties.Resources.resources
     目录           0  2017-10-12 17:24  SocketTest\SocketClient\obj\x86\Debug\TempPE\
     文件         498  2017-10-12 17:24  SocketTest\SocketClient\Program.cs
     目录           0  2017-10-12 17:24  SocketTest\SocketClient\Properties\
     文件        1356  2017-10-12 17:24  SocketTest\SocketClient\Properties\AssemblyInfo.cs
     文件        2876  2017-10-12 17:24  SocketTest\SocketClient\Properties\Resources.Designer.cs
     文件        5612  2017-10-12 17:24  SocketTest\SocketClient\Properties\Resources.resx
     文件        1099  2017-10-12 17:24  SocketTest\SocketClient\Properties\Settings.Designer.cs
     文件         249  2017-10-12 17:24  SocketTest\SocketClient\Properties\Settings.settings
............此处省略35个文件信息