C# WinForm使用Socket通信搭建简易聊天室

1、创建WinForm应用程序

主入口两个按钮事件：

     /// <summary>
    /// 打开客户端
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    private void btn_OpenClient_Click(object sender, EventArgs e)
    {
        SocketClient socketClient = new SocketClient();
        socketClient.ShowDialog();
    }
    /// <summary>
    /// 打开服务端
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    private void btn_OpenService_Click(object sender, EventArgs e)
    {
        SocketService socketService = new SocketService();
        socketService.ShowDialog();
    }

View Code

2、服务端界面绘制

其中txt_MessageBox与txtSendBox属性Multiline=true

3、客户端界面绘制

4、服务端功能实现

using System;
using System.Collections.Generic;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using System.Windows.Forms;

namespace Socket通信聊天室
{
    public partial class SocketService : Form
    {
        public SocketService()
        {
            InitializeComponent();
            //多线程编程中，如果子线程需要使用主线程中创建的对象和控件，最好在主线程中体现进行检查取消
            CheckForIllegalCrossThreadCalls = false;
        }
        /// <summary>
        /// 界面加载
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void SocketService_Load(object sender, EventArgs e)
        {
            //获取Ip大概率位【0.0.0.0】表示任何IP
            //在服务端连接的时候先查看本机Ipv4地址
            var ip = IPAddress.Any.ToString();
            this.txt_IpAddress.Text = ip;
        }
        /// <summary>
        /// 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)
        /// </summary>
        Dictionary<string, System.Net.Sockets.Socket> clientList = new Dictionary<string, System.Net.Sockets.Socket>();
        private void btn_Create_Click(object sender, EventArgs e)
        {
            System.Threading.Thread myServer = new System.Threading.Thread(MySocket);
            //设置这个线程是后台线程
            myServer.IsBackground = true;
            myServer.Start();
        }
        /// <summary>
        /// 发送
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btn_Send_Click(object sender, EventArgs e)
        {
            if (this.txtSendBox.Text != "")
            {
                SendMsg(this.txtSendBox.Text);
                this.txtSendBox.Text = "";
            }
        }
        /// <summary>
        /// 创建连接的方法
        /// </summary>
        public void MySocket()
        {
            //1.创建服务器端电话
            Socket server = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.IP);
            //2.创建手机卡
            IPAddress iP = IPAddress.Parse(this.txt_IpAddress.Text);
            IPEndPoint endPoint = new IPEndPoint(iP, int.Parse(this.txt_Port.Text));
            //3.将电话卡插进电话中
            server.Bind(endPoint);
            //4.开始监听电话卡
            //同一时刻内允许同时加入链接的最大数量
            server.Listen(20);
            this.txt_MessageBox.AppendText("服务器已经成功开启! \r\n");
            //5.等待来电接电话
            while (true)
            {
                //接受接入的一个客户端
                Socket connectClient = server.Accept();
                if (connectClient != null)
                {
                    string infor = connectClient.RemoteEndPoint.ToString();
                    clientList.Add(infor, connectClient);
                    this.txt_MessageBox.AppendText(infor + "加入服务器! \r\n");
                    ///服务器将消息发送至客服端
                    string msg = $"[{infor}]已成功进入到聊天室!";
                    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;
                    //设置这个线程中的通信对象是对应的Socket和客户端Socket进行通信
                    threadClient.Start(connectClient);
                }
            }
        }
        /// <summary>
        /// 不停尝试接收服务器接收到客户端发送的消息
        /// </summary>
        /// <param name="o">客户端</param>
        public void ReciveMsg(object o)
        {
            Socket client = o as Socket;
            while (true)
            {
                try
                {
                    ///定义服务器接收的字节大小
                    byte[] arrMsg = new byte[1024 * 1024];
                    ///接收到的信息大小(所占字节数)
                    int length = client.Receive(arrMsg);
                    if (length > 0)
                    {
                        string recMsg = Encoding.UTF8.GetString(arrMsg, 0, length);
                        //获取客户端的端口号
                        IPEndPoint endPoint = client.RemoteEndPoint as IPEndPoint;
                        //服务器显示客户端的端口号和消息
                        this.txt_MessageBox.AppendText($"{DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss")}[{ endPoint.Port.ToString()}]：{recMsg} \r\n");
                        //服务器发送接收到的客户端信息给客户端
                        SendMsg($"[{endPoint.Port.ToString()}]{recMsg}");
                    }
                }
                catch (Exception)
                {
                    ///关闭客户端
                    client.Close();
                    ///移除添加在字典中的服务器和客户端之间的线程
                    clientList.Remove(client.RemoteEndPoint.ToString());
                }
            }
        }
        /// <summary>
        /// 服务器发送消息，
        /// </summary>
        public 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，发送消息
                item.Value.Send(arrMsg);
            }
        }

    }
}

View Code

5、客户端功能实现

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

namespace Socket通信聊天室
{
    /// <summary>
    /// 客户端
    /// </summary>
    public partial class SocketClient : Form
    {
        public SocketClient()
        {
            InitializeComponent();
        }
        /// <summary>
        /// Socket连接
        /// </summary>
        private System.Net.Sockets.Socket socket;
        /// <summary>
        /// 加入聊天室
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btn_Join_Click(object sender, EventArgs e)
        {
            // Internet 协议、字节流、IPv4连接
            socket = new System.Net.Sockets.Socket(
                System.Net.Sockets.AddressFamily.InterNetwork,
                System.Net.Sockets.SocketType.Stream,
                System.Net.Sockets.ProtocolType.IP);
            System.Net.IPAddress ip = System.Net.IPAddress.Parse(this.txt_IpAddress.Text);
            System.Net.IPEndPoint point = new System.Net.IPEndPoint(ip, int.Parse(this.txt_Port.Text));
            socket.Connect(point);

            System.Threading.Thread thread = new System.Threading.Thread(ReciveMsg);
            thread.IsBackground = true;
            thread.Start(socket);
        }
        /// <summary>
        ///  不停的尝试接收消息
        ///  接收信息
        /// </summary>
        /// <param name="o">客户端</param>
        public void ReciveMsg(object o)
        {
            System.Net.Sockets.Socket client = o as System.Net.Sockets.Socket;
            while (true)
            {
                try
                {
                    ///定义客户端接收到的信息大小
                    byte[] arrList = new byte[1024 * 1024];
                    ///接收到的信息大小(所占字节数)
                    int length = client.Receive(arrList);
                    this.txt_MessageBox.AppendText($"{DateTime.Now}：{Encoding.UTF8.GetString(arrList, 0, length)} \r\n");
                }
                catch (Exception)
                {
                    client.Close();
                }
            }
        }
        /// <summary>
        /// 发送消息
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btn_Send_Click(object sender, EventArgs e)
        {
            if (txtSendBox.Text != "")
            {
                byte[] arrMsg = Encoding.UTF8.GetBytes(txtSendBox.Text);
                socket.Send(arrMsg);
            }
        }
    }
}