asp.net 利用ip获取所在地代码

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

namespace QQWry.NET
{

public class IPLocation
{
private string _IP;
private string _Country;
private string _Local;
public string IP
{ get{return _IP;}
set{_IP = value;}
}
public string Country
{ get{return _Country;}
set{_Country = value;}
}
public string Local
{ get{return _Local;}
set{_Local = value;}
}
}
public class QQWryLocator
{
private byte[] data;
Regex regex = new Regex(@"(((\d{1,2})|(1\d{2})|(2[0-4]\d)|(25[0-5]))\.){3}((\d{1,2})|(1\d{2})|(2[0-4]\d)|(25[0-5]))");
long firstStartIpOffset;
long lastStartIpOffset;
long ipCount;
public long Count { get { return ipCount; } }
public QQWryLocator(string dataPath)
{
using (FileStream fs = new FileStream(dataPath, FileMode.Open, FileAccess.Read, FileShare.Read))
{
data = new byte[fs.Length];
fs.Read(data, 0, data.Length);
}
byte[] buffer = new byte[8];
Array.Copy(data, 0, buffer, 0, 8);
firstStartIpOffset = ((buffer[0] + (buffer[1] * 0x100)) + ((buffer[2] * 0x100) * 0x100)) + (((buffer[3] * 0x100) * 0x100) * 0x100);
lastStartIpOffset = ((buffer[4] + (buffer[5] * 0x100)) + ((buffer[6] * 0x100) * 0x100)) + (((buffer[7] * 0x100) * 0x100) * 0x100);
ipCount = Convert.ToInt64((double)(((double)(lastStartIpOffset - firstStartIpOffset)) / 7.0));

if (ipCount {
throw new ArgumentException("ip FileDataError");
}
}
private static long IpToInt(string ip)
{
char[] separator = new char[] { '.' };
if (ip.Split(separator).Length == 3)
{
ip = ip + ".0";
}
string[] strArray = ip.Split(separator);
long num2 = ((long.Parse(strArray[0]) * 0x100L) * 0x100L) * 0x100L;
long num3 = (long.Parse(strArray[1]) * 0x100L) * 0x100L;
long num4 = long.Parse(strArray[2]) * 0x100L;
long num5 = long.Parse(strArray[3]);
return (((num2 + num3) + num4) + num5);
}
private static string IntToIP(long ip_Int)
{
long num = (long)((ip_Int & 0xff000000L) >> 0x18);
if (num {
num += 0x100L;
}
long num2 = (ip_Int & 0xff0000L) >> 0x10;
if (num2 {
num2 += 0x100L;
}
long num3 = (ip_Int & 0xff00L) >> 8;
if (num3 {
num3 += 0x100L;
}
long num4 = ip_Int & 0xffL;
if (num4 {
num4 += 0x100L;
}
return (num.ToString() + "." + num2.ToString() + "." + num3.ToString() + "." + num4.ToString());
}
public IPLocation Query(string ip)
{
if (!regex.Match(ip).Success)
{
throw new ArgumentException("IP格式错误");
}
IPLocation ipLocation = new IPLocation();
ipLocation.IP = ip;
long intIP = IpToInt(ip);
if ((intIP >= IpToInt("127.0.0.1") && (intIP {
ipLocation.Country = "本机内部环回地址";
ipLocation.Local = "";
}
else
{
if ((((intIP >= IpToInt("0.0.0.0")) && (intIP = IpToInt("64.0.0.0")) && (intIP ((intIP >= IpToInt("58.0.0.0")) && (intIP {
ipLocation.Country = "网络保留地址";
ipLocation.Local = "";
}
}
long right = ipCount;
long left = 0L;
long middle = 0L;
long startIp = 0L;
long endIpOff = 0L;
long endIp = 0L;
int countryFlag = 0;
while (left {
middle = (right + left) / 2L;
startIp = GetStartIp(middle, out endIpOff);
if (intIP == startIp)
{
left = middle;
break;
}
if (intIP > startIp)
{
left = middle;
}
else
{
right = middle;
}
}
startIp = GetStartIp(left, out endIpOff);
endIp = GetEndIp(endIpOff, out countryFlag);
if ((startIp = intIP))
{
string local;
ipLocation.Country = GetCountry(endIpOff, countryFlag, out local);
ipLocation.Local = local;
}
else
{
ipLocation.Country = "未知";
ipLocation.Local = "";
}
return ipLocation;
}
private long GetStartIp(long left, out long endIpOff)
{
long leftOffset = firstStartIpOffset + (left * 7L);
byte[] buffer = new byte[7];
Array.Copy(data, leftOffset, buffer, 0, 7);
endIpOff = (Convert.ToInt64(buffer[4].ToString()) + (Convert.ToInt64(buffer[5].ToString()) * 0x100L)) + ((Convert.ToInt64(buffer[6].ToString()) * 0x100L) * 0x100L);
return ((Convert.ToInt64(buffer[0].ToString()) + (Convert.ToInt64(buffer[1].ToString()) * 0x100L)) + ((Convert.ToInt64(buffer[2].ToString()) * 0x100L) * 0x100L)) + (((Convert.ToInt64(buffer[3].ToString()) * 0x100L) * 0x100L) * 0x100L);
}
private long GetEndIp(long endIpOff, out int countryFlag)
{
byte[] buffer = new byte[5];
Array.Copy(data, endIpOff, buffer, 0, 5);
countryFlag = buffer[4];
return ((Convert.ToInt64(buffer[0].ToString()) + (Convert.ToInt64(buffer[1].ToString()) * 0x100L)) + ((Convert.ToInt64(buffer[2].ToString()) * 0x100L) * 0x100L)) + (((Convert.ToInt64(buffer[3].ToString()) * 0x100L) * 0x100L) * 0x100L);
}
///