得到本机在公网IP地址

//创建类

using System;

using System.IO;

using System.Net;

using System.Text;

using System.Text.RegularExpressions;



/// <summary>

///GetOutIP 的摘要说明

/// </summary>

public class GetOutIP

{

    private string strgetIP;





    public GetOutIP()

    {

        //

        //TODO: 在此处添加构造函数逻辑

        //

        netIP();

        getIP();



    }



    public string renetIP()

    { return netIP(); }//返回网络IP



    public string regetIP()

    { return strgetIP; }//返回内网IP





    static string netIP()

    {

        Uri uri = new Uri("http://www.ip138.com/ip2city.asp");//查本机网络IP的网页

        HttpWebRequest req = (HttpWebRequest)WebRequest.Create(uri);

        req.Method = "POST";

        req.ContentType = "application/x-www-form-urlencoded";

        req.ContentLength = 0;

        req.CookieContainer = new CookieContainer();

        req.GetRequestStream().Write(new byte[0], 0, 0);

        HttpWebResponse res = (HttpWebResponse)(req.GetResponse());

        StreamReader rs = new StreamReader(res.GetResponseStream(), Encoding.GetEncoding("GB18030"));

        string s = rs.ReadToEnd();

        rs.Close();

        req.Abort();

        res.Close();

        s = s.Substring(s.IndexOf('[') + 1, s.Length - s.LastIndexOf(']') -11);      //自己灵活取出IP

        return s;

        //Match m = Regex.Match(s, @"IP：\[(?<IP>[0-9\.]*)\]");

        //if (m.Success) return m.Groups["IP"].Value;

        //string strnetIP = string.Empty;

        //return strnetIP;

       



    }



    public string getIP()//注意与static 的区别

    {

        System.Net.IPAddress[] addressList = Dns.GetHostByName(Dns.GetHostName()).AddressList;//获取本机内网IP





        strgetIP = addressList[0].ToString();

        return strgetIP;



    }

}