下面是服务器端的代码，里面注释都很清楚我就不解释了

Serve form 上有一个btnListen的button,一个表连接状态的：Connection State的label,还有一个表连接状态的txtBox:txtConState

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using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

using System.IO;

using System.Net;

using System.Net.Sockets;

namespace FileSendServer

{

public partial class FileSendServer : Form

{

public FileSendServer()

{

InitializeComponent();

}

private void btnListen_Click(object sender, EventArgs e)

{

　　object obj = new string[] { "172.25.73.158

[] buff = new Byte[256];

int result;

//new file

if (File.Exists(filename))

{

File.Delete(filename);

}

//StreamWrite

StreamWriter sr = new StreamWriter(File.Create(filename));

while (true)

{

buff = new Byte[256];

result = mySoket.Receive(buff); //接收来自绑定的 Socket 的数据。

sr.Write(Encoding.Default.GetString(buff));

//sr.Write();

if (result < 256)

break;

}

sr.Close();//close buffer write

//txtConState.Clear();

}

catch (SocketException ex)

{

Console.WriteLine(ex.ToString());

}

}

}

}

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

using System.IO;

using System.Net;

using System.Net.Sockets;

namespace FileSendServer

{

public partial class FileSendServer : Form

{

public FileSendServer()

{

InitializeComponent();

}

private void btnListen_Click(object sender, EventArgs e)

{

　　object obj = new string[] { "172.25.73.158

); //将 Socket 置于侦听状态,参数backlog为挂起连接队列的最大长度

//accept the call

Socket mySoket = listenSocket.Accept(); //为新建连接创建新的 Socket。

txtConState.Text = "已建立联接!";

//define a buff

Byte[] buff = new Byte[256];

int result;

//new file

if (File.Exists(filename))

{

File.Delete(filename);

}

//StreamWrite

StreamWriter sr = new StreamWriter(File.Create(filename));

while (true)

{

buff = new Byte[256];

result = mySoket.Receive(buff); //接收来自绑定的 Socket 的数据。

sr.Write(Encoding.Default.GetString(buff));

//sr.Write();

if (result < 256)

break;

}

sr.Close();//close buffer write

//txtConState.Clear();

}

catch (SocketException ex)

{

Console.WriteLine(ex.ToString());

}

}

}

}

下面是客户端代码,

客户端是有一个，btnBrowse的打开浏览button,加了一个OpenFileDialog控件,一个btnSendFile的文件传输button,一个用于显示地址的文本框：txtFilePath

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using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

using System.IO;

using System.Net;

using System.Net.Sockets;

namespace FileSendClient

{

public partial class FileSendClient : Form

{

public static string path;

public FileSendClient()

{

InitializeComponent();

}

private void btnBrowse_Click(object sender, EventArgs e)

{

if (openFileDialog1.ShowDialog() == DialogResult.OK)

{

this.txtFilePath.Text = openFileDialog1.FileName;

path = openFileDialog1.FileName;

}

}

private void btnSendFile_Click(object sender, EventArgs e)

{

String ServerIP = "172.25.73.158";

string filename = path;

//string filename="C:\\\est.txt";

try

{

//为 Internet 主机地址信息提供容器类。

IPHostEntry ipHost = Dns.GetHostEntry(ServerIP); //将主机名或 IP 地址解析为 IPHostEntry 实例。

IPAddress ipAddr = ipHost.AddressList[0];

IPEndPoint ipEndP = new IPEndPoint(ipAddr, 11000);

Socket client = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);

//connect

client.Connect(ipEndP);

Console.WriteLine("Sending {0} to the Host下载本文