C# TCP 网络编程示例

//服务器
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Forms;
using System.Drawing;
using System.IO;
using System.Collections;
using System.Configuration;
using MySql.Data;
using MySql.Data.MySqlClient;
using System.Data;
using System.Net;
using System.Net.Sockets;

class SimpleDialog : Form
{
public static void Main()
{

IPEndPoint ipe = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 8889);//用指定的端口和ip初始化IPEndPoint类的新实例

///创建socket并开始监听
Socket s　=　new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);//创建一个socket对像，如果用udp协议，则要用SocketType.Dgram类型的套接字
s.Bind(ipe);//绑定EndPoint对像（8889端口和ip地址）
s.Listen(0);//开始监听
Console.WriteLine("等待客户端连接");

///接受到client连接，为此连接建立新的socket，并接受信息
Socket temp = s.Accept();//为新建连接创建新的socket
Console.WriteLine("建立连接");
string recvStr = "";
byte[] recvBytes = new byte[1024];
int bytes;
bytes = temp.Receive(recvBytes, recvBytes.Length, 0);//从客户端接受信息
recvStr += Encoding.ASCII.GetString(recvBytes, 0, bytes);

///给client端返回信息
Console.WriteLine("server get message:{0}", recvStr);//把客户端传来的信息显示出来
string sendStr = "ok!Client send message successful!";
byte[] bs = Encoding.ASCII.GetBytes(sendStr);
temp.Send(bs, bs.Length, 0);//返回信息给客户端
temp.Close();
s.Close();
Console.ReadLine();

}

}

//客户端
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net;
using System.Net.Sockets;

class Program
{
static void Main(string[] args)
{
try
{
IPEndPoint ipe = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 8889);//把ip和端口转化为IPEndpoint实例

///创建socket并连接到服务器
Socket c = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);//创建Socket
Console.WriteLine("Conneting…");
c.Connect(ipe);//连接到服务器

///向服务器发送信息
string sendStr = "hello!This is a socket test";
byte[] bs = Encoding.ASCII.GetBytes(sendStr);//把字符串编码为字节
Console.WriteLine("Send Message");
c.Send(bs, bs.Length, 0);//发送信息

///接受从服务器返回的信息
string recvStr = "";
byte[] recvBytes = new byte[1024];
int bytes;
bytes = c.Receive(recvBytes, recvBytes.Length, 0);//从服务器端接受返回信息
recvStr += Encoding.ASCII.GetString(recvBytes, 0, bytes);
Console.WriteLine("client get message:{0}", recvStr);//显示服务器返回信息
///一定记着用完socket后要关闭
c.Close();
}
catch (ArgumentNullException e)
{
Console.WriteLine("argumentNullException: {0}", e);
}
catch (SocketException e)
{
Console.WriteLine("SocketException:{0}", e);
}
Console.WriteLine("Press Enter to Exit");
}
}