//发送文件

        private void btn_sendFile_Click(object sender, EventArgs e)

        {

            //打开文件

            OpenFileDialog dlg = new OpenFileDialog();

            if (dlg.ShowDialog() == DialogResult.OK)

            {

                //初始化接受套接字：寻址方案，以字符流方式和Tcp通信

                socketSent = new Socket(AddressFamily.InterNetwork,

                       SocketType.Stream,

                       ProtocolType.Tcp);

                //设置服务器IP地址和端口

                ipSent = new IPEndPoint(IPAddress.Parse(ip), 8001);

                //与服务器进行连接

                ClassSocket socketConnet = new ClassSocket(socketSent, ipSent);

                Thread tConnection = new Thread(new ThreadStart(socketConnet.SocketConnect));

                tConnection.Start();

                Thread.Sleep(100);

                //将要发送的文件加上"DAT"标识符

                ClassSentFile sentFile = new ClassSentFile(dlg, socketSent);

                Thread tSentFile = new Thread(new ThreadStart(sentFile.SentFile));

                tSentFile.Start();

            }

        }

using System;using System.Collections.Generic;using System.Text;using System.IO;using System.Net;using System.Net.Sockets;using System.Windows.Forms;namespace Message

{

    class ClassSentFile

    {

        private OpenFileDialog dlg;

        private Socket socketSent;

        public ClassSentFile(OpenFileDialog dlg, Socket socketSent)

        {

            this.dlg = dlg;

            this.socketSent = socketSent;

        }

        public void SentFile()

        {

            string msg = "DAT " + dlg.FileName;

            //将 "msg" 转化为字节流的形式进行传送

            socketSent.Send(Encoding.Default.GetBytes(msg));

            //定义一个读文件流

            FileStream read = new FileStream(dlg.FileName, FileMode.Open, FileAccess.Read);

            //设置缓冲区为1024byte

            byte[] buff = new byte[1024];

            int len = 0;

            while ((len = read.Read(buff, 0, 1024)) != 0)

            {

                //按实际的字节总量发送信息

                socketSent.Send(buff, 0, len, SocketFlags.None);

            }

            //将要发送信息的最后加上"END"标识符

            msg = "END";

            //将 "msg" 发送

            socketSent.Send(Encoding.Default.GetBytes(msg));

            socketSent.Close();

            read.Close();

        }

    }

}

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