using System;
using System.IO;
using System.Net;
using System.Text;
using System.Text.RegularExpressions;
using System.Xml;

namespace ConsoleApplication1
{
    public static class Domain
    {
        /// <summary>
        /// 域名查询
        /// </summary>
        /// <param name="domain"></param>
        /// <returns>
        ///     -1  : Exception
        ///     210 : Domain name is available
        ///     211 : Domain name is not available
        ///     212 : Domain name is invalid
        ///     213 : Timeout
        /// </returns>
        public static int Check(string domain)
        {
            int result = -1;
            try
            {
                Encoding encoding = Encoding.GetEncoding("gb2312");
                Uri uri = new Uri(string.Format("http://panda.www.net.cn/cgi-bin/check.cgi?area_domain={0}", domain));
                WebRequest webRequest = WebRequest.Create(uri);
                WebResponse webResponse = webRequest.GetResponse();
                using (StreamReader streamReader = new StreamReader(webResponse.GetResponseStream(), encoding))
                {
                    XmlDocument xmlDocument = new XmlDocument();
                    xmlDocument.LoadXml(streamReader.ReadToEnd());
                    XmlNode xmlNode = xmlDocument.SelectSingleNode("/property/original");
                    if (xmlNode != null)
                    {
                        Match match = Regex.Match(xmlNode.InnerText, @"\d+");
                        if (match.Success)
                        {
                            return int.Parse(match.Value);
                        }
                    }
                }
            }
            catch { }

            return result;
        }
    }
}