Socket服务端

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

namespace socket服务
{
    public partial class socket服务端 : Form
    {
        public socket服务端()
        {
            InitializeComponent();
            Form.CheckForIllegalCrossThreadCalls = false;
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }
        /// 创建一个字典，用来存储记录服务器与客户端之间的连接(线程问题)
        private Dictionary<string, Socket> clientList = new Dictionary<string, Socket>();
        /// <summary>
        /// 启动服务
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button1_Click(object sender, EventArgs e)
        {
            Thread myServer = new Thread(MySocket);
            //设置这个线程是后台线程
            myServer.IsBackground = true;
            myServer.Start();
        }
        /// 创建连接的方法
        private void MySocket()
        {
            try
            {
                //启用按钮不可用
                button1.Enabled = false;
                int port = 8201;
                string host = "127.0.0.1";
                IPAddress ip = IPAddress.Parse(host);
                IPEndPoint ipe = new IPEndPoint(ip, port);
                Socket sSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
                sSocket.Bind(ipe);
                sSocket.Listen(0);
                listBox1.Items.Add("监听已经打开，请等待");
                while (true)
                {
                    Socket connectClient = sSocket.Accept();
                    if (connectClient != null)
                    {
                        string infor = connectClient.RemoteEndPoint.ToString();
                        clientList.Add(infor, connectClient);
                        listBox1.Items.Add(infor + "客户端接入!");
                        ///服务器将消息发送至客服端
                        string msg = "连接成功!";
                        SendMsg(msg);
                        //每有一个客户端接入时，需要有一个线程进行服务 
                        Thread threadClient = new Thread(ReciveMsg);
                        threadClient.IsBackground = true;

                        //创建的新的对应的Socket和客户端Socket进行通信
                        threadClient.Start(connectClient);
                    }
                }
            }
            catch (Exception ex)
            {
                button1.Enabled = true;
                
                listBox1.Invoke(new MethodInvoker(delegate () { listBox1.Items.Add("发生异常:" + ex.Message); }));
            }
        }
        /// 服务器接收到客户端发送的消息
        private void ReciveMsg(object o)
        {
            //connectClient负责客户端的通信
            Socket connectClient = o as Socket;
            IPEndPoint endPoint = null;
            while (true)
            {
                try
                {
                    byte[] arrMsg = new byte[1024 * 1024];
                    int length = connectClient.Receive(arrMsg);
                    if (length > 0)
                    {
                        string recMsg = Encoding.UTF8.GetString(arrMsg, 0, length);
                        endPoint = connectClient.RemoteEndPoint as IPEndPoint;
                        //服务器显示客户端的端口号和消息
                        listBox1.Items.Add(DateTime.Now + "客户端请求:[" + endPoint.Port.ToString() + "]：" + recMsg);

                        //服务器(connectClient)发送接收到的客户端信息给客户端
                        SendMsg("服务端响应:[" + endPoint.Port.ToString() + "]：" + recMsg);
                    }
                }
                catch (Exception)
                {
                    ///移除添加在字典中的服务器和客户端之间的线程
       
                        clientList.Remove(endPoint.ToString());
                        connectClient.Dispose();
                        listBox1.Items.Add("客户端连接断开!");
                        break; 
                }
            }
        }

        /// 服务器发送消息，客户端接收
        private void SendMsg(string str)
        {
            ///遍历出字典中的所有线程
            foreach (var item in clientList)
            {
                byte[] arrMsg = Encoding.UTF8.GetBytes(str);
                ///获取键值(服务器），发送消息
                item.Value.Send(arrMsg);
            }
        }
        /// <summary>
        /// 窗体
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            listBox1.HorizontalScrollbar = true;//任何时候都显示水平滚动条
            listBox1.ScrollAlwaysVisible = true;//任何时候都显示垂直滚动条
        }
    }
}