C# Winform 服务器和多个客户端通讯

实现功能效果如图所示：

1、服务器端：

 服务器界面如下：

代码如下：

public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();

            //关闭对文本框的非线程操作检查
            TextBox.CheckForIllegalCrossThreadCalls = false;
        }

        string RemoteEndPoint;     //客户端的网络结点

        Thread threadwatch = null;//负责监听客户端的线程
        Socket socketwatch = null;//负责监听客户端的套接字
        //创建一个和客户端通信的套接字
        Dictionary dic = new Dictionary { };   //定义一个集合，存储客户端信息


        private void btnServerListen_Click(object sender, EventArgs e)
        {
            btnServerListen.Enabled = false;

            //定义一个套接字用于监听客户端发来的消息，包含三个参数（IP4寻址协议，流式连接，Tcp协议）
            socketwatch = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);

            //服务端发送信息需要一个IP地址和端口号
            IPAddress address = IPAddress.Parse(txtServerIP.Text.Trim());//获取文本框输入的IP地址

            //将IP地址和端口号绑定到网络节点point上
            IPEndPoint point = new IPEndPoint(address, int.Parse(txtServerPort.Text.Trim()));//获取文本框上输入的端口号
            //此端口专门用来监听的

            //监听绑定的网络节点
            socketwatch.Bind(point);

            //将套接字的监听队列长度限制为20
            socketwatch.Listen(20);

            //创建一个监听线程
            threadwatch = new Thread(watchconnecting);



            //将窗体线程设置为与后台同步，随着主线程结束而结束
            threadwatch.IsBackground = true;

            //启动线程   
            threadwatch.Start();

            //启动线程后 textBox3文本框显示相应提示
            txtRecv.AppendText(\"开始监听客户端传来的信息!\" + \"\\r\\n\");
        }

        void OnlineList_Disp(string Info)
        {
            txtClientIP.Items.Add(Info);   //在线列表中显示连接的客户端套接字
        }

        //监听客户端发来的请求
        private void watchconnecting()
        {
            Socket connection = null;
            while (true)  //持续不断监听客户端发来的请求   
            {
                try
                {
                    connection = socketwatch.Accept();
                }
                catch (Exception ex)
                {
                    txtRecv.AppendText(ex.Message); //提示套接字监听异常   
                    break;
                }
                //获取客户端的IP和端口号
                IPAddress clientIP = (connection.RemoteEndPoint as IPEndPoint).Address;
                int clientPort = (connection.RemoteEndPoint as IPEndPoint).Port;

                //让客户显示\"连接成功的\"的信息
                string sendmsg = \"连接服务端成功！\\r\\n\" + \"本地IP:\" + clientIP + \"，本地端口\" + clientPort.ToString();
                byte[] arrSendMsg = Encoding.UTF8.GetBytes(sendmsg);
                connection.Send(arrSendMsg);

                RemoteEndPoint = connection.RemoteEndPoint.ToString(); //客户端网络结点号
                txtRecv.AppendText(\"成功与\" + RemoteEndPoint + \"客户端建立连接！\\t\\n\");     //显示与客户端连接情况
                dic.Add(RemoteEndPoint, connection);    //添加客户端信息

                OnlineList_Disp(RemoteEndPoint);    //显示在线客户端


                //IPEndPoint netpoint = new IPEndPoint(clientIP,clientPort);

                IPEndPoint netpoint = connection.RemoteEndPoint as IPEndPoint;

                //创建一个通信线程    
                ParameterizedThreadStart pts = new ParameterizedThreadStart(recv);
                Thread thread = new Thread(pts);
                thread.IsBackground = true;//设置为后台线程，随着主线程退出而退出   
                //启动线程   
                thread.Start(connection);
            }
        }

        ///   
        /// 接收客户端发来的信息    
        ///   
        ///客户端套接字对象  
        private void recv(object socketclientpara)
        {

            Socket socketServer = socketclientpara as Socket;
            while (true)
            {
                //创建一个内存缓冲区 其大小为1024*1024字节  即1M   
                byte[] arrServerRecMsg = new byte[1024 * 1024];
                //将接收到的信息存入到内存缓冲区,并返回其字节数组的长度  
                try
                {
                    int length = socketServer.Receive(arrServerRecMsg);

                    //将机器接受到的字节数组转换为人可以读懂的字符串   
                    string strSRecMsg = Encoding.UTF8.GetString(arrServerRecMsg, 0, length);

                    //将发送的字符串信息附加到文本框txtMsg上   
                    txtRecv.AppendText(\"客户端:\" + socketServer.RemoteEndPoint + \",time:\" + GetCurrentTime() + \"\\r\\n\" + strSRecMsg + \"\\r\\n\\n\");
                }
                catch (Exception ex)
                {
                    txtRecv.AppendText(\"客户端\" + socketServer.RemoteEndPoint + \"已经中断连接\" + \"\\r\\n\"); //提示套接字监听异常 
                    txtClientIP.Items.Remove(socketServer.RemoteEndPoint.ToString());//从listbox中移除断开连接的客户端
                    socketServer.Close();//关闭之前accept出来的和客户端进行通信的套接字
                    break;
                }
            }
        }

        /// 

        /// 获取当前系统时间的方法
        /// 
        /// 
        private DateTime GetCurrentTime()
        {
            DateTime currentTime = new DateTime();
            currentTime = DateTime.Now;
            return currentTime;
        }

        private void btnSend_Click(object sender, EventArgs e)
        {
            string sendMsg = txtSend.Text.Trim() + \"\\r\\n\";  //要发送的信息
            //byte[] bytes = System.Text.Encoding.UTF8.GetBytes(sendMsg);   //将要发送的信息转化为字节数组，因为Socket发送数据时是以字节的形式发送的
            byte[] bytes = System.Text.Encoding.ASCII.GetBytes(sendMsg);   //将要发送的信息转化为字节数组，因为Socket发送数据时是以字节的形式发送的
            if (txtClientIP.SelectedIndex == -1)
            {
                MessageBox.Show(\"请选择要发送的客户端！\", \"提示\", MessageBoxButtons.OK, MessageBoxIcon.Stop);
            }
            else
            {
                string selectClient = txtClientIP.Text;  //选择要发送的客户端
                dic[selectClient].Send(bytes);   //发送数据
                txtSend.Clear();
                //txtRecv.AppendText(label4.Text + GetCurrentTime() + \"\\r\\n\" + sendMsg + \"\\r\\n\");

            }

        }

        private void btnSendAll_Click(object sender, EventArgs e)
        {
            string sendMsg = txtSend.Text.Trim() + \"\\r\\n\";  //要发送的信息    
            //将要发送的信息转化为字节数组，因为Socket发送数据时是以字节的形式发送的
            byte[] bytes = System.Text.Encoding.ASCII.GetBytes(sendMsg);
            int count = txtClientIP.Items.Count;
            if(count<1)
            {
                MessageBox.Show(\"当前无客户端连接！\", \"提示\", MessageBoxButtons.OK, MessageBoxIcon.Stop);
            }
            foreach(var selectClient in txtClientIP.Items)
            {
                string str = selectClient.ToString();
                dic[str].Send(bytes);   //发送数据
            }

        }
    }

2、客户端。

界面如下：

代码如下：

public Form1()
        {
            InitializeComponent();

            //关闭对文本框的非法线程操作检查
            TextBox.CheckForIllegalCrossThreadCalls = false;
        }

        //创建 1个客户端套接字 和1个负责监听服务端请求的线程
        Thread threadclient = null;
        Socket socketclient = null;
        List mlist = new List();

        private void btnConnect_Click(object sender, EventArgs e)
        {
            //SocketException exception;
            this.btnConnect.Enabled = false;
            //定义一个套接字监听
            socketclient = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);

            //获取文本框中的IP地址
            IPAddress address = IPAddress.Parse(txtIP.Text.Trim());

            //将获取的IP地址和端口号绑定在网络节点上
            IPEndPoint point = new IPEndPoint(address, int.Parse(txtPort.Text.Trim()));

            try
            {
                //客户端套接字连接到网络节点上，用的是Connect
                socketclient.Connect(point);
            }
            catch (Exception)
            {
                //MessageBox.
                MessageBox.Show(\"连接失败\\r\\n\");
                this.btnConnect.Enabled = true;
                return;
            }

            threadclient = new Thread(recv);

            threadclient.IsBackground = true;

            threadclient.Start();
        }

        // 接收服务端发来信息的方法  
        private void recv()//
        {
            int x = 0;
            while (true)//持续监听服务端发来的消息
            {
                try
                {
                    //定义一个1M的内存缓冲区，用于临时性存储接收到的消息
                    byte[] arrRecvmsg = new byte[1024 * 1024];

                    //将客户端套接字接收到的数据存入内存缓冲区，并获取长度
                    int length = socketclient.Receive(arrRecvmsg);

                    //将套接字获取到的字符数组转换为人可以看懂的字符串
                    string strRevMsg = Encoding.UTF8.GetString(arrRecvmsg, 0, length);
                    if (x == 1)
                    {
                        txtRecv.AppendText(\"服务器:\" + GetCurrentTime() + \"\\r\\n\" + strRevMsg + \"\\r\\n\\n\");

                    }
                    else
                    {

                        txtRecv.AppendText(strRevMsg + \"\\r\\n\\n\");
                        x = 1;
                    }
                }
                catch (Exception ex)
                {
                    //txtRecv.AppendText(\"远程服务器已经中断连接\" + \"\\r\\n\");
                    this.btnConnect.Enabled = true;
                    break;
                }
            }
        }

        //获取当前系统时间
        private DateTime GetCurrentTime()
        {
            DateTime currentTime = new DateTime();
            currentTime = DateTime.Now;
            return currentTime;
        }

        //发送字符信息到服务端的方法
        private void ClientSendMsg(string sendMsg)
        {
            //将输入的内容字符串转换为机器可以识别的字节数组   
            byte[] arrClientSendMsg = Encoding.UTF8.GetBytes(sendMsg);
            //调用客户端套接字发送字节数组   
            socketclient.Send(arrClientSendMsg);
            //将发送的信息追加到聊天内容文本框中   
            txtRecv.AppendText(this.label4.Text + \": \" + GetCurrentTime() + \"\\r\\n\" + sendMsg + \"\\r\\n\\n\");
        }


        private void btnSend_Click(object sender, EventArgs e)
        {
            //调用ClientSendMsg方法 将文本框中输入的信息发送给服务端   
            ClientSendMsg(txtSend.Text.Trim());
            //txtSend.Clear();
        }

        private void txtSend_KeyDown(object sender, KeyEventArgs e)
        {
            //当光标位于文本框时 如果用户按下了键盘上的Enter键
            if (e.KeyCode == Keys.Enter)
            {
                //则调用客户端向服务端发送信息的方法  
                ClientSendMsg(txtSend.Text.Trim());
                txtSend.Clear();
            }
        }

        private void btnExit_Click(object sender, EventArgs e)
        {
            Application.Exit();
        }

        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            DialogResult result = MessageBox.Show(\"是否退出？选否,最小化到托盘\", \"操作提示\", MessageBoxButtons.YesNoCancel, MessageBoxIcon.Question);
            if (result == DialogResult.Yes)
            {
                if (threadclient!=null)
                {
                    threadclient.Abort();
                }
                
                Thread.Sleep(500);
                if (socketclient == null)
                {
                    this.Dispose();
                }
                else
                {
                    socketclient.Close();
                    this.Dispose();
                }
            }
            else if (result == DialogResult.Cancel)
            {
                e.Cancel = true;

            }
            else
            {
                e.Cancel = true;
                this.WindowState = FormWindowState.Minimized;
                this.Visible = false;
                //this.notifyIcon1.Visible = true;
                this.ShowInTaskbar = false;
            }

        }

        
    }