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RC1140
如何通过 C# 判断某个 IP 所属的地区？这样我就可以方便统计。
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Jaimes
可以借助第三方API接口，参考网址：https://ipapi.co/8.8.8.8/country/ ， C# 代码如下：
using System;
using System.Net;
using System.IO;
using System.Text;public class Program
{public static void Main(){ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;HttpWebRequest request = (HttpWebRequest)WebRequest.Create("https://ipapi.co/8.8.8.8/country/");HttpWebResponse response = (HttpWebResponse)request.GetResponse();var reader = new System.IO.StreamReader(response.GetResponseStream(), ASCIIEncoding.ASCII);Console.WriteLine(reader.ReadToEnd());}
}Vlam
有一个离线的 IP地区库，可以实现完全的离线查询，下载链接：https://lite.ip2location.com/database/ip-country
创建表并导入
CREATE DATABASE ip2location
GOUSE ip2location
GOCREATE TABLE [ip2location].[dbo].[ip2location_db1]([ip_from] float NOT NULL,[ip_to] float NOT NULL,[country_code] nvarchar(2) NOT NULL,[country_name] nvarchar(64) NOT NULL,
) ON [PRIMARY]
GOCREATE INDEX [ip_from] ON [ip2location].[dbo].[ip2location_db1]([ip_from]) ON [PRIMARY]
GOCREATE INDEX [ip_to] ON [ip2location].[dbo].[ip2location_db1]([ip_to]) ON [PRIMARY]
GOBULK INSERT [ip2location].[dbo].[ip2location_db1]FROM 'C:\[path to your CSV file]\IP2LOCATION-LITE-DB1.CSV'WITH(FORMATFILE = 'C:\[path to your DB1.FMT file]\DB1.FMT')
GO代码查询
数据库有了，接下来就可以用 C# 查询了。
public class Form1 {private void Form1_Load(object sender, System.EventArgs e) {string ip = "8.8.8.8";this.IP2Location(ip);}private void IP2Location(string myip) {IPAddress address = null;if (IPAddress.TryParse(myip, address)) {byte[] addrBytes = address.GetAddressBytes();this.LittleEndian(addrBytes);UInt32 ipno = 0;ipno = BitConverter.ToUInt32(addrBytes, 0);string sql = "SELECT TOP 1 * FROM ip2location_db1 WHERE ip_to >= \'" + ipno.ToString() + "\'";object conn = new SqlConnection("Server=yourserver;Database=yourdatabase;User Id=youruserid;Password=yourpassword;");object comm = new SqlCommand(sql, conn);SqlDataReader reader;comm.Connection.Open();reader = comm.ExecuteReader(CommandBehavior.CloseConnection);int x = 0;object sb = new StringBuilder(250);if (reader.HasRows) {if (reader.Read()) {for (x = 0; (x <= (reader.FieldCount() - 1)); x++) {sb.Append((reader.GetName(x) + (": " + (reader.GetValue(x) + "\r\n"))));}}}reader.Close();MsgBox(sb.ToString());}}private void LittleEndian(ref byte[] byteArr) {if (BitConverter.IsLittleEndian) {List<byte> byteList = new List<byte>(byteArr);byteList.Reverse();byteArr = byteList.ToArray();}}
}点评区
没想到还有离线版本的 IP地址库，这个不错，学习了。
；解决办法)
