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   源码介绍

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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;
using System.Net;
using System.Net.Sockets;
using System.IO;
using System.Threading;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        private bool control = false;
        private TcpClient client;
        private int i;
        private NetworkStream netStream;
        private FileStream fileStream = null;
        private Stream stream = null;
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            int port = 0;
            IPAddress myIP = IPAddress.Parse("127.0.0.1");
            try
            {
                myIP = IPAddress.Parse(textBox1.Text);
            }
            catch
            {
                MessageBox.Show("你输入的IP地址格式错误！");
            }
            try
            {
                port = Int32.Parse(textBox2.Text);
            }

            catch { MessageBox.Show("请输入整数。"); }
            try
            {
                client.Connect(myIP, port);
                statusStrip1.Text = "与服务器建立连接";
                netStream = client.GetStream();
                byte[] b = new byte[6400];
                int i = netStream.Read(b, 0, 6400);
                string str = System.Text.Encoding.BigEndianUnicode.GetString(b);
                richTextBox1.AppendText(str);
                int j = richTextBox1.Lines.Length;
                for(int k=0;k<j-1;k  )
                {
                    comboBox1.Items.Add(richTextBox1.Lines[k]);

                }
                comboBox1.Text = comboBox1.Items[0].ToString();

            }
            catch (Exception ex) { MessageBox.Show(ex.Message); }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            control = false;
            if(saveFileDialog1.ShowDialog() ==DialogResult.OK)
            {//创建新的文件流
                fileStream =new FileStream(saveFileDialog1.FileName,FileMode.Open,FileAccess.Write);
                //获得服务器网络流
                netStream = client.GetStream();
                string down = comboBox1.Text   "\r\n";
                byte[] b = System.Text.Encoding.BigEndianUnicode.GetBytes(down.ToCharArray());
                //发送要下载的文件名给服务器
                netStream.Write(b, 0, b.Length);
                //流shuaxin
                netStream.Flush();
                //启动接收文件的线程
                Thread thread = new Thread(new ThreadStart(download));
                thread.Start();
            }
        }
        private void download()
        {
            //由于在线程中要使用控件，在这里禁止检查跨线程的调用是否合法
            Control.CheckForIllegalCrossThreadCalls = false;
            Stream stream = null;
            //获取网络流
            stream = client.GetStream();
            int length = 1024;
            byte[] b = new byte[1024];
            int num = stream.Read(b, 0, length);
            //读取网络流并写入文件
            while(num > 0)
            {
                //读取服务器流
                string str = System.Text.Encoding.ASCII.GetString(b);
                int m = str.IndexOf("<EOF>");
                if(m == -1)
                {
                    fileStream.Write(b, 0, num);
                    fileStream.Flush();
                    statusStrip1.Text = "正在下载文件";
                }
                else
                {
                    fileStream.Write(b, 0, m);
                    fileStream.Flush();
                    break;
                }
            }
            fileStream.Close();
            MessageBox.Show("下载完毕！");
            statusStrip1.Text = "文件下载完毕";
        }

        private void button3_Click(object sender, EventArgs e)
        {
            try
            {
                netStream = client.GetStream();
                string end = "@@@@@@"   "\r\n";
                byte[] byt = System.Text.Encoding.BigEndianUnicode.GetBytes(end.ToCharArray());
                netStream.Write(byt,0,byt.Length);
                netStream.Flush();
                client.Close();
                statusStrip1.Text = "与服务器断开连接";
            }
            catch{}
        }
       
    }
}