c# asp.net获取域名whois信息

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Net;

using System.Net.Sockets;

namespace BLL

{

public class Whois

{

/**/

/// <summary>

/// 域名注册查询

/// </summary>

/// <param name="domain">输入域名，不包含www</param>

/// <returns></returns>

public static string Get(string domain)

{

if (domain == null)

throw new ArgumentNullException();

int ccStart = domain.LastIndexOf(".");

if (ccStart < 0 || ccStart == domain.Length)

throw new ArgumentException();

string ret = "";

Socket s = null;

try

{

string cc = domain.Substring(ccStart + 1);

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

s.Connect(new IPEndPoint(Dns.Resolve(cc + ".whois-servers.net").AddressList[0], 43));

s.Send(Encoding.ASCII.GetBytes(domain + "/r/n"));

byte[] buffer = new byte[1024];

int recv = s.Receive(buffer);

while (recv > 0)

{

ret += Encoding.UTF8.GetString(buffer, 0, recv);

recv = s.Receive(buffer);

}

s.Shutdown(SocketShutdown.Both);

}

catch

{

throw new SocketException();

}

finally

{

if (s != null)

s.Close();

}

return ret;

}

}

}