使用 Socket 类向 HTTP 服务器发送数据和接收响应。

using System;using System.Text;using System.IO;using System.Net;using System.Net.Sockets;public class GetSocket{    private static Socket ConnectSocket(string server, int port)    {        Socket s = null;        IPHostEntry hostEntry = null;        // Get host related information.        hostEntry = Dns.GetHostEntry(server);        // Loop through the AddressList to obtain the supported AddressFamily. This is to avoid        // an exception that occurs when the host IP Address is not compatible with the address family        // (typical in the IPv6 case).        foreach(IPAddress address in hostEntry.AddressList)        {            IPEndPoint ipe = new IPEndPoint(address, port);            Socket tempSocket =                 new Socket(ipe.AddressFamily, SocketType.Stream, ProtocolType.Tcp);            tempSocket.Connect(ipe);            if(tempSocket.Connected)            {                s = tempSocket;                break;            }            else            {                continue;            }        }        return s;    }    // This method requests the home page content for the specified server.    private static string SocketSendReceive(string server, int port)     {        string request = "GET / HTTP/1.1\r\nHost: " + server +             "\r\nConnection: Close\r\n\r\n";        Byte[] bytesSent = Encoding.ASCII.GetBytes(request);        Byte[] bytesReceived = new Byte[256];        // Create a socket connection with the specified server and port.        Socket s = ConnectSocket(server, port);        if (s == null)            return ("Connection failed");        // Send request to the server.        s.Send(bytesSent, bytesSent.Length, 0);          // Receive the server home page content.        int bytes = 0;        string page = "Default HTML page on " + server + ":\r\n";        // The following will block until te page is transmitted.        do {            bytes = s.Receive(bytesReceived, bytesReceived.Length, 0);            page = page + Encoding.ASCII.GetString(bytesReceived, 0, bytes);        }        while (bytes > 0);        return page;    }    public static void Main(string[] args)     {        string host;        int port = 80;        if (args.Length == 0)            // If no server name is passed as argument to this program,             // use the current host name as the default.            host = Dns.GetHostName();        else            host = args[0];        string result = SocketSendReceive(host, port);         Console.WriteLine(result);    }}