一个简易的聊天程序（Socket）

效果图：

服务端Server代码：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
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网络编程_Server
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void btnStart_Click(object sender, EventArgs e)
        {
            try
            {
                //当点击开始监听的时候 在服务器端创建一个负责监IP地址跟端口号的Socket
                Socket socketWatch = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
                IPAddress ip = IPAddress.Any;
                //创建端口号对象
                IPEndPoint point = new IPEndPoint(ip, Convert.ToInt32(txtPort.Text));
                //监听
                socketWatch.Bind(point);
                ShowMsg("监听成功");
                socketWatch.Listen(10);

                Thread th = new Thread(Listen);
                th.IsBackground = true;
                th.Start(socketWatch);
            }
            catch
            { }

        }

        /// <summary>
        /// 等待客户端的连接 并且创建与之通信用的Socket
        /// </summary>
        Socket socketSend;
        void Listen(Object o)//线程所执行的函数，如果有参数，必须是Object类型
        {
            Socket socketWatch = o as Socket;
            //等待客户端的连接 并且创建一个负责通信的Socket
            while (true)
            {
                try
                {
                    //负责跟客户端通信的Socket
                    socketSend = socketWatch.Accept();
                    //将远程连接的客户端的IP地址和Socket存入集合中
                    dicSocket.Add(socketSend.RemoteEndPoint.ToString(),socketSend);
                    //将远程连接的客户端的IP地址和Socket存入到下拉框中
                    cboUsers.Items.Add(socketSend.RemoteEndPoint.ToString());
                    //192.168.11.87：连接成功
                    ShowMsg(socketSend.RemoteEndPoint.ToString() + "：连接成功");
                    //开启一个新线程，不停的接收客户端发来的消息
                    Thread th = new Thread(Recive);
                    th.IsBackground = true;
                    th.Start(socketSend);
                }
                catch
                { }

            }
        }

        //将远程连接的客户端的IP地址和Socket存入集合中
        Dictionary<string, Socket> dicSocket = new Dictionary<string, Socket>();

        /// <summary>
        /// 服务器端不停的接收客户端发来的消息
        /// </summary>
        /// <param name="o"></param>
        void Recive(Object o)
        {
            Socket socketSend = o as Socket;
            while (true)
            {
                try
                {
                    //客户端连接成功后，服务器应该接受客户端发来的信息
                    byte[] buffer = new byte[1024 * 1024 * 2];
                    //实际接收到的有效字节数
                    int r = socketSend.Receive(buffer);
                    if (r == 0)
                    {
                        break;
                    }
                    string str = Encoding.UTF8.GetString(buffer, 0, r);
                    ShowMsg(socketSend.RemoteEndPoint + ":" + str);
                }
                catch
                { }
            }
        }

        void ShowMsg(string str)
        {
            txtLog.AppendText(str + "\r\n");
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            Control.CheckForIllegalCrossThreadCalls = false;
        }

        /// <summary>
        /// 服务器给客户端发送消息
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnSend_Click(object sender, EventArgs e)
        {
            try
            {
                string str = txtMsg.Text;
                byte[] buffer = Encoding.UTF8.GetBytes(str);

                List<byte> list = new List<byte>();
                list.Add(0);
                list.AddRange(buffer);
                //将泛型集合转换为集合
                byte[] newBuffer = list.ToArray();

                //获得用户在下拉框总选中的IP地址
                string ip = cboUsers.SelectedItem.ToString();
                dicSocket[ip].Send(newBuffer);
                //socketSend.Send(buffer);
            }
            catch
            {}

        }

        /// <summary>
        /// 选择要发送的文件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnSelect_Click(object sender, EventArgs e)
        {
            OpenFileDialog ofd = new OpenFileDialog();
            ofd.Title = "请选择";
            ofd.InitialDirectory = @"C:\Users\Administrator\Desktop";
            ofd.Filter = "所有文件|*.*";
            ofd.ShowDialog();

            txtPath.Text = ofd.FileName;
        }

        private void btnSendFile_Click(object sender, EventArgs e)
        {
            //获得要发送文件的路径
            string path = txtPath.Text;
            using (FileStream fsRead=new FileStream(path,FileMode.Open,FileAccess.Read))
            {
                byte[] buffer = new byte[1024 * 1024 * 5];

                int r = fsRead.Read(buffer, 0, buffer.Length);

                List<byte> list = new List<byte>();
                list.Add(1);
                list.AddRange(buffer);
                byte[] newBuffer = list.ToArray();
                dicSocket[cboUsers.SelectedItem.ToString()].Send(newBuffer, 0, r+1, SocketFlags.None);
            }
        }

        /// <summary>
        /// 发送震动
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnZD_Click(object sender, EventArgs e)
        {
            byte[] buffer = new byte[1];
            buffer[0] = 2;
            dicSocket[cboUsers.SelectedItem.ToString()].Send(buffer);
        }
    }
}

客户端Client代码：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
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网络编程_Client
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        Socket socketSend;
        private void btnStart_Click(object sender, EventArgs e)
        {
            try
            {
                //创建负责通信的Socket    1:表示IP v4     2:什么类型的流,流氏的   3:对应的服务
                socketSend = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
                //需要将文本框的IP地址转换成IPAddress类型
                IPAddress ip = IPAddress.Parse(txtServer.Text);
                //需要将端口号转换成IPEndPoint类型
                IPEndPoint point = new IPEndPoint(ip, Convert.ToInt32(txtPort.Text));
                //获得要连接的远程服务器应用程序的IP地址和端口号
                socketSend.Connect(point);

                ShowMsg("连接成功");

                //开启一个新的线程不停的接收服务器端发来的消息
                Thread th = new Thread(Recive);
                th.IsBackground = true;
                th.Start();
            }
            catch { }
        }

        /// <summary>
        /// 不停的接收服务器发来的消息
        /// </summary>
        void Recive()
        {
            while (true)
            {
                try
                {
                    byte[] buffer = new byte[1024 * 1024 * 3];
                    //实际接收到的有效字节数
                    int r = socketSend.Receive(buffer);
                    if (r == 0)
                    {
                        break;
                    }

                    //先拿到第一位，判断发送的是否文字消息
                    if (buffer[0] == 0)
                    {
                        //注意解码的时候要从第一个开始到长度-1个字节
                        string s = Encoding.UTF8.GetString(buffer, 1, r-1);
                        ShowMsg(socketSend.RemoteEndPoint + ":" + s);
                    }
                    if (buffer[0] == 1)
                    {
                        SaveFileDialog sfd = new SaveFileDialog();
                        sfd.InitialDirectory = @"C:\Users\Administrator\Desktop";
                        sfd.Title = "请选择要保存的文件";
                        sfd.Filter = "所有文件|*.*";
                        sfd.ShowDialog(this);//不加this弹不出？
                        string path = sfd.FileName;
                        using (FileStream fsWrite=new FileStream(path,FileMode.OpenOrCreate,FileAccess.Write))
                        {
                            fsWrite.Write(buffer,1,r-1);
                        }
                        MessageBox.Show("保存成功 ");
                    }
                    if (buffer[0] == 2)
                    {
                        ZD();
                    }
                }
                catch { }
            }
        }

        /// <summary>
        /// 震动
        /// </summary>
        void ZD()
        {
            for (int i = 0; i < 500; i++)
            {
                this.Location = new Point(200, 200);
                this.Location = new Point(280,280);
            }
        }

        void ShowMsg(string str)
        {
            txtLog.AppendText(str + "\r\n");
        }

        /// <summary>
        /// 客户端给服务器发送消息
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnSend_Click(object sender, EventArgs e)
        {
            string str = txtMsg.Text.Trim();
            byte[] buffer = Encoding.UTF8.GetBytes(str);
            socketSend.Send(buffer);
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            Control.CheckForIllegalCrossThreadCalls = false;
        }

    }
}