ASP.NET实现根据IP获取省市地址的方法

1、在网站的跟路径下面添加QQWry.dat（点击此处本站下载https://www.jb51.net/softs/10529.html）文件，这个文件是IP数据库文件

2、添加以下一个类 IPScanner

复制代码 代码如下:

public class IPScanner
{
        //私有成员#region 私有成员
        private string dataPath;
        private string ip;
        private string country;
        private string local;

private long firstStartIp = 0;
        private long lastStartIp = 0;
        private FileStream objfs = null;
        private long startIp = 0;
        private long endIp = 0;
        private int countryFlag = 0;
        private long endIpOff = 0;
        private string errMsg = null;

        //构造函数#region 构造函数
        public IPScanner()
        {
            this.dataPath = System.Web.HttpContext.Current.Server.MapPath("/ipdata/QQWry.dat");
        }

//公共属性#region 公共属性
        public string DataPath
        {
            set { dataPath = value; }
        }
        public string IP
        {
            set { ip = value; }
        }
        public string Country
        {
            get { return country; }
        }
        public string Local
        {
            get { return local; }
        }
        public string ErrMsg
        {
            get { return errMsg; }
        }

//搜索匹配数据#region 搜索匹配数据
        private int QQwry()
        {
            string pattern = @"(((\\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]))";
            Regex objRe = new Regex(pattern);
            Match objMa = objRe.Match(ip);
            if (!objMa.Success)
            {
                this.errMsg = "IP格式错误";
                return 4;
            }

long ip_Int = this.IpToInt(ip);
            int nRet = 0;
            if (ip_Int >= IpToInt("127.0.0.0") && ip_Int <= IpToInt("127.255.255.255"))
            {
                this.country = "本机内部环回地址";
                this.local = "";
                nRet = 1;
            }
            else if ((ip_Int >= IpToInt("0.0.0.0") && ip_Int <= IpToInt("2.255.255.255")) || (ip_Int >= IpToInt("64.0.0.0") && ip_Int <= IpToInt("126.255.255.255")) || (ip_Int >= IpToInt("58.0.0.0") && ip_Int <= IpToInt("60.255.255.255")))
            {
                this.country = "网络保留地址";
                this.local = "";
                nRet = 1;
            }
            objfs = new FileStream(this.dataPath, FileMode.Open, FileAccess.Read);
            try
            {
                objfs.Position = 0;
                byte[] buff = new Byte[8];
                objfs.Read(buff, 0, 8);
                firstStartIp = buff[0] + buff[1] * 256 + buff[2] * 256 * 256 + buff[3] * 256 * 256 * 256;
                lastStartIp = buff[4] * 1 + buff[5] * 256 + buff[6] * 256 * 256 + buff[7] * 256 * 256 * 256;
                long recordCount = Convert.ToInt64((lastStartIp - firstStartIp) / 7.0);
                if (recordCount <= 1)
                {
                    country = "FileDataError";
                    objfs.Close();
                    return 2;
                }
                long rangE = recordCount;
                long rangB = 0;
                long recNO = 0;
                while (rangB < rangE - 1)
                {
                    recNO = (rangE + rangB) /2;
                    this.GetStartIp(recNO);
                    if (ip_Int ==this.startIp)
                    {
                        rangB = recNO;
                        break;
                    }if (ip_Int >this.startIp)
                        rangB = recNO;
                    else
                        rangE = recNO;
                }this.GetStartIp(rangB);
                this.GetEndIp();
                if (this.startIp <= ip_Int &&this.endIp >= ip_Int)
                {
                    this.GetCountry();
                    this.local =this.local.Replace("（我们一定要解放台湾！！！）", "");
                }else{
                    nRet =3;
                    this.country ="未知";
                    this.local ="";
                }
                objfs.Close();
                return nRet;
            }catch{
                return1;
            }
        }// IP地址转换成Int数据#region IP地址转换成Int数据 privatelong IpToInt(string ip)
        {
            char[] dot =newchar[] { '.' };
            string[] ipArr = ip.Split(dot);
            if (ipArr.Length ==3)
                ip = ip +".0";
            ipArr = ip.Split(dot);