小编给大家分享一下c#如何实现根据网络IP显示地理位置功能，相信大部分人都还不怎么了解，因此分享这篇文章给大家参考一下，希望大家阅读完这篇文章后大有收获，下面让我们一起去了解一下吧！
用户信息表，是大多数系统都有的。我们也知道，通常都会有类似 注册IP 和 最后登录IP 这两个的字段，来存储用户注册时候的IP地址和最后登录的IP的地址。
获取这样的地址，在后台显示 xxx.xxx.xxx.xxx 的地址段，让人看到很不自然，根本就不知道具体地理位置。
现在我们就简单的实现一下这个功能。
用到了读取纯真IP数据库的公用组件QQWry.NET 这个组件，作者阿不。（谢谢他的共享）
还要去下载新的纯真IP地址库，下载获得QQWry.dat
最后请出Js中的小靓妞，jquery-1.3.1.js
新建Web项目AjaxIP，将QQWry.dat添加到App_Data下。
然后添加QQWry.NET的组件类，如下：
Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--> 1 using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Text.RegularExpressions;
using System.Net;
using System.Net.Sockets;
namespace AjaxIP
{
public class IPLocation
{
public string IP { get; set; }
public string Country { get; set; }
public string Local { get; set; }
}
public class QQWryLocator
{
static Encoding encoding = Encoding.GetEncoding("GB2312");
private byte[] data;
int firstStartIpOffset;
int lastStartIpOffset;
int ipCount;
public int 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);
}
firstStartIpOffset = (int)data[0] + (((int)data[1]) << 8) + (((int)data[2]) << 16) + (((int)data[3]) << 24);
lastStartIpOffset = (int)data[4] + (((int)data[5]) << 8) + (((int)data[6]) << 16) + (((int)data[7]) << 24);
ipCount = (lastStartIpOffset - firstStartIpOffset) / 7 + 1;
if (ipCount <= 1)
{
throw new ArgumentException("ip FileDataError");
}
}
public static uint IpToInt(string ip)
{
//string[] strArray = ip.Split('.');
//return (uint.Parse(strArray[0]) << 24) + (uint.Parse(strArray[1]) << 16) + (uint.Parse(strArray[2]) << 8) + uint.Parse(strArray[0]);
//return (uint)IPAddress.HostToNetworkOrder((int)(IPAddress.Parse(ip).Address));
byte[] bytes = IPAddress.Parse(ip).GetAddressBytes();
return (uint)bytes[3] + (((uint)bytes[2]) << 8) + (((uint)bytes[1]) << 16) + (((uint)bytes[0]) << 24);
}
public static string IntToIP(uint ip_Int)
{
return new IPAddress(ip_Int).ToString();
}
public IPLocation Query(string ip)
{
IPAddress address = IPAddress.Parse(ip);
if (address.AddressFamily != AddressFamily.InterNetwork)
{
throw new ArgumentException("不支持非IPV4的地址");
}
if (IPAddress.IsLoopback(address))
{
return new IPLocation() { IP = ip, Country = "本机内部环回地址", Local = string.Empty };
}
uint intIP = (uint)IPAddress.HostToNetworkOrder((int)address.Address);
//if ((((intIP >= IpToInt("0.0.0.0")) && (intIP <= IpToInt("2.255.255.255"))) || ((intIP >= IpToInt("64.0.0.0")) && (intIP <= IpToInt("126.255.255.255")))) ||
//((intIP >= IpToInt("58.0.0.0")) && (intIP <= IpToInt("60.255.255.255"))))
//if (intIP <= 50331647 || (intIP >= 1073741824 && intIP <= 2130706431) || (intIP >= 973078528 && intIP <= 1023410175))
//{
// return new IPLocation() { IP = ip, Country = "网络保留地址", Local = string.Empty };
//}
IPLocation ipLocation = new IPLocation() { IP = ip };
uint right = (uint)ipCount;
uint left = 0;
uint middle = 0;
uint startIp = 0;
uint endIpOff = 0;
uint endIp = 0;
int countryFlag = 0;
while (left < (right - 1))
{
middle = (right + left) / 2;
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) && (endIp >= intIP))
{
string local;
ipLocation.Country = GetCountry(endIpOff, countryFlag, out local);
ipLocation.Local = local;
}
else
{
ipLocation.Country = "未知";
ipLocation.Local = string.Empty;
}
return ipLocation;
}
private uint GetStartIp(uint left, out uint endIpOff)
{
int leftOffset = (int)(firstStartIpOffset + (left * 7));
endIpOff = (uint)data[4 + leftOffset] + (((uint)data[5 + leftOffset]) << 8) + (((uint)data[6 + leftOffset]) << 16);
return (uint)data[leftOffset] + (((uint)data[1 + leftOffset]) << 8) + (((uint)data[2 + leftOffset]) << 16) + (((uint)data[3 + leftOffset]) << 24);
}
private uint GetEndIp(uint endIpOff, out int countryFlag)
{
countryFlag = data[4 + endIpOff];
return (uint)data[endIpOff] + (((uint)data[1 + endIpOff]) << 8) + (((uint)data[2 + endIpOff]) << 16) + (((uint)data[3 + endIpOff]) << 24);
}
///
/// Gets the country.
///
/// The end ip off.
/// The country flag.
/// The local.
/// country
private string GetCountry(uint endIpOff, int countryFlag, out string local)
{
string country = string.Empty;
uint offset = endIpOff + 4;
switch (countryFlag)
{
case 1:
case 2:
country = GetFlagStr(ref offset, ref countryFlag, ref endIpOff);
offset = endIpOff + 8;
local = (1 == countryFlag) ? string.Empty : GetFlagStr(ref offset, ref countryFlag, ref endIpOff);
break;
default:
country = GetFlagStr(ref offset, ref countryFlag, ref endIpOff);
local = GetFlagStr(ref offset, ref countryFlag, ref endIpOff);
break;
}
return country;
}
private string GetFlagStr(ref uint offset, ref int countryFlag, ref uint endIpOff)
{
int flag = 0;
while (true)
{
flag = data[offset];
//没有重定向
if (flag != 1 && flag != 2)
{
break;
}
if (flag == 2)
{
countryFlag = 2;
endIpOff = offset - 4;
}
offset = (uint)data[1 + offset] + (((uint)data[2 + offset]) << 8) + (((uint)data[3 + offset]) << 16);
}
if (offset < 12)
{
return string.Empty;
}
return GetStr(ref offset);
}
///
/// 读取字符串...
///
///
/// 再来新建 IPSearch.ashx 文件，如下：
Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--> 1 using System;
using System.Collections;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Services;
using System.Web.Services.Protocols;
using System.Xml.Linq;
namespace AjaxIP
{
///
/// IP查询 的摘要说明
///
public class IPSearch : IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "text/plain";
string ip = context.Request["ip"];
string ipFilePath = @"\App_Data\QQWry.dat";
QQWryLocator QQWry = new QQWryLocator(ipFilePath);
IPLocation loc = QQWry.Query(ip);
context.Response.Write(string.Format("{0} {1}",loc.Country,loc.Local));
}
public bool IsReusable
{
get
{
return false;
}
}
}
}最后在Default.aspx页面写下，js和有IP的用户信息，如下：