以前可以直接下载，现在获取ip数据库的方式改变了，自行官网查看把，个人或者学术研究，商用追责，商业用途慎用

using System.Collections.Generic;
using System.IO;
using System.Reflection;
using System.Text;
using System;
using Microsoft.Extensions.Options;
using Youhuo.ConfigModel;
using System.Text.RegularExpressions;

namespace Stu01
{
    public class IPSearchHelper
    {
        private readonly IOptions<ChunZhenSetting> options;
        System.IO.FileStream ipFile;
        long ip;

        public IPSearchHelper(IOptions<ChunZhenSetting> options)
        {
            this.options = options;
        }

        ///<summary>
        /// 地理位置,包括国家和地区
        ///</summary>
        public struct IPLocation
        {
            public string country, area;
        }

        ///<summary>
        /// 获取指定IP所在地理位置
        ///</summary>
        ///<param name="strIP">要查询的IP地址</param>
        ///<returns></returns>
        public IPLocation GetIPLocation(string strIP)
        {
            IPLocation loc = new IPLocation();
            //return loc;
            
            if (string.IsNullOrEmpty(strIP))
            {
                return loc;
            }
            var match = Regex.Match(strIP, @"^(25[0-5]|2[0-4]\d|[0-1]?\d?\d)(\.(25[0-5]|2[0-4]\d|[0-1]?\d?\d)){3}$");
            if (!match.Success)
            {
                return loc;
            }
            ip = IPToLong(strIP);
            var RegexStr = @"(^[\/\\].*)|(.*:.*)";//判断是不是绝对路径,options.Value.DatPath纯真数据库存放的路径
            if (System.Text.RegularExpressions.Regex.IsMatch(options.Value.DatPath, RegexStr))
            {
                ipFile = new System.IO.FileStream(options.Value.DatPath, System.IO.FileMode.Open, System.IO.FileAccess.Read);
            }
            else
            {
                var fullPath = Path.Combine(Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location), options.Value.DatPath);
                ipFile = new System.IO.FileStream(fullPath, System.IO.FileMode.Open, System.IO.FileAccess.Read);
            }
            long[] ipArray = BlockToArray(ReadIPBlock());
            long offset = SearchIP(ipArray, 0, ipArray.Length - 1) * 7 + 4;
            ipFile.Position += offset;//跳过起始IP
            ipFile.Position = ReadLongX(3) + 4;//跳过结束IP

            int flag = ipFile.ReadByte();//读取标志
            if (flag == 1)//表示国家和地区被转向
            {
                ipFile.Position = ReadLongX(3);
                flag = ipFile.ReadByte();//再读标志
            }
            long countryOffset = ipFile.Position;
            loc.country = ReadString(flag);

            if (flag == 2)
            {
                ipFile.Position = countryOffset + 3;
            }
            flag = ipFile.ReadByte();
            loc.area = ReadString(flag);

            ipFile.Close();
            ipFile = null;
            return loc;
            
        }

        ///<summary>
        /// 将字符串形式的IP转换位long
        ///</summary>
        ///<param name="strIP"></param>
        ///<returns></returns>
        public long IPToLong(string strIP)
        {
            if (strIP.Equals("::1"))
            {
                strIP = "127.0.0.1";
            }
            byte[] ip_bytes = new byte[8];
            string[] strArr = strIP.Split(new char[] { '.' });
            if (strArr.Length <= 1)
            {
                return 0;
            }
            byte tmpNumber;
            for (int i = 0; i < 4; i++)
            {
                var res = byte.TryParse(strArr[3 - i], out tmpNumber);
                ip_bytes[i] = res ? tmpNumber : (byte)0;
            }
            return BitConverter.ToInt64(ip_bytes, 0);
        }

        ///<summary>
        /// 将索引区字节块中的起始IP转换成Long数组
        ///</summary>
        ///<param name="ipBlock"></param>
        long[] BlockToArray(byte[] ipBlock)
        {
            long[] ipArray = new long[ipBlock.Length / 7];
            int ipIndex = 0;
            byte[] temp = new byte[8];
            for (int i = 0; i < ipBlock.Length; i += 7)
            {
                Array.Copy(ipBlock, i, temp, 0, 4);
                ipArray[ipIndex] = BitConverter.ToInt64(temp, 0);
                ipIndex++;
            }
            return ipArray;
        }

        ///<summary>
        /// 从IP数组中搜索指定IP并返回其索引
        ///</summary>
        ///<param name="ipArray">IP数组</param>
        ///<param name="start">指定搜索的起始位置</param>
        ///<param name="end">指定搜索的结束位置</param>
        ///<returns></returns>
        int SearchIP(long[] ipArray, int start, int end)
        {
            int middle = (start + end) / 2;
            if (middle == start)
                return middle;
            else if (ip < ipArray[middle])
                return SearchIP(ipArray, start, middle);
            else
                return SearchIP(ipArray, middle, end);
        }

        ///<summary>
        /// 读取IP文件中索引区块
        ///</summary>
        ///<returns></returns>
        byte[] ReadIPBlock()
        {
            long startPosition = ReadLongX(4);
            long endPosition = ReadLongX(4);
            long count = (endPosition - startPosition) / 7 + 1;//总记录数
            ipFile.Position = startPosition;
            byte[] ipBlock = new byte[count * 7];
            ipFile.Read(ipBlock, 0, ipBlock.Length);
            ipFile.Position = startPosition;
            return ipBlock;
        }

        ///<summary>
        /// 从IP文件中读取指定字节并转换位long
        ///</summary>
        ///<param name="bytesCount">需要转换的字节数，主意不要超过8字节</param>
        ///<returns></returns>
        long ReadLongX(int bytesCount)
        {
            byte[] _bytes = new byte[8];
            ipFile.Read(_bytes, 0, bytesCount);
            return BitConverter.ToInt64(_bytes, 0);
        }

        ///<summary>
        /// 从IP文件中读取字符串
        ///</summary>
        ///<param name="flag">转向标志</param>
        ///<returns></returns>
        string ReadString(int flag)
        {
            if (flag == 1 || flag == 2)//转向标志
                ipFile.Position = ReadLongX(3);
            else
                ipFile.Position -= 1;

            List<byte> list = new List<byte>();
            byte b = (byte)ipFile.ReadByte();
            while (b > 0)
            {
                list.Add(b);
                b = (byte)ipFile.ReadByte();
            }
            Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);
            return Encoding.GetEncoding("GB2312").GetString(list.ToArray());
        }
    }
}

但是有高并发问题

提供了多种语言的支持，更新频率高，支持高并发

Install-Package IP2Region.Net

下载保存xdbhttps://github.com/lionsoul2014/ip2region/blob/master/data/ip2region.xdb

//这里为啥直接填写ip2region.xdb，因为用了始终复制
ISearcher searcher = new Searcher(CachePolicy.File, "ip2region.xdb");
var ipResult = searcher.Search("123.232.22.18");

C#版本，简单易用，支持高并发响应快，但是更新频率不高

Install-Package IPTools.China

下载ip数据库https://github.com/stulzq/IPTools/raw/master/db/ip2region.db，设置为始终复制

运行代码即可

IpTool.Search("your ip address");

结果

{
    "IpAddress":"123.232.22.18",
    "Country":"中国",
    "CountryCode":null,
    "Province":"山东",
    "ProvinceCode":null,
    "City":"济南",
    "PostCode":null,
    "NetworkOperator":"联通",
    "Latitude":0,
    "Longitude":0,
    "AccuracyRadius":null
}