判断大陆IPAddress

using System;
using System.Collections.Generic;
using System.Text;
using System.IO;

namespace IPInfoService
{
    public class AddressService
    {
        public List<IPArea> listIP = new List<IPArea>();

        /**//// <summary>
        /// 填充大陆IP代码段列表
        /// </summary>
        public AddressService()
        {
            string iPDBPath = @"D:\ApexLog\eTrade\Clicks\ipDB\country-ipv4.lst";//Down loaded from "http://ftp.apnic.net/apnic/dbase/data/country-ipv4.lst"
            StreamReader srIp = new StreamReader(iPDBPath);
            while (!srIp.EndOfStream)
            {
                string strLine = srIp.ReadLine();
                int index = strLine.IndexOf("cn");
                if (index != -1)
                {
                    string[] strArr = strLine.Split(' ');

                    listIP.Add(new IPArea(strArr[0], strArr[2]));
                }
            }
            srIp.Close();
        }

        /**//// <summary>
        /// 该IP是否来自中国大陆
        /// </summary>
        /// <param name="ipAddress"></param>
        /// <returns></returns>
        public bool ScopeIncludingIpAddress(string ipAddress)
        {
            long intCurrentIP = IpToInt(ipAddress);
            for (int i = 0; i < listIP.Count; i++)
            {
                if (IpToInt(listIP[i].strIpStart) <= intCurrentIP && intCurrentIP <= IpToInt(listIP[i].strIpEnd))
                {
                    return true;
                }
            }
            return false;
        }

        /**//// <summary>
        /// IP地址转换成Int数据
        /// </summary>
        /// <param name="ip"></param>
        /// <returns></returns>
        private long IpToInt(string ip)
        {
            char[] dot = new char[] { '.' };
            string[] ipArr = ip.Split(dot);
            if (ipArr.Length == 3)
                ip = ip + ".0";
            ipArr = ip.Split(dot);

            long ip_Int = 0;
            long p1 = long.Parse(ipArr[0]) * 256 * 256 * 256;
            long p2 = long.Parse(ipArr[1]) * 256 * 256;
            long p3 = long.Parse(ipArr[2]) * 256;
            long p4 = long.Parse(ipArr[3]);
            ip_Int = p1 + p2 + p3 + p4;
            return ip_Int;
        }

    }

    public class IPArea
    {
        public string strIpStart;
        public string strIpEnd;
        public IPArea(string strStart,string strEnd)
        {
            this.strIpEnd = strEnd;
            this.strIpStart = strStart;
        }
    }
}