class Program
    {
        static void Main(string[] args)
        {
            try
            {
                //传入要查询的ip 和17monipdb.datx 下载的ip库所在位置

                string address = IPAddress.FindIPAddress("1.198.219.205", @"D:\开发资料\资料\Code\IP地址获取\IPAddress\IPAddress\bin\Debug"); 
                Console.WriteLine(address);
            }
            catch (IOException ioex)
            {
                Console.WriteLine(ioex.StackTrace);
            }
            catch (IPv4FormatException ipex)
            {
                Console.WriteLine(ipex.StackTrace);
            }
            Console.ReadKey(true);
        }
    }
    public class IPAddress
    {
        public static string FindIPAddress(string ip,string basePath)
        {
            string address = "";
            if (string.IsNullOrEmpty(ip))
            {
                return address;
            }
            try
            {
                string path = string.Format("{0}\\{1}", basePath, "17monipdb.datx");
                City city = new City(path);
                string[] arr = city.find(ip);
                if (arr != null && arr.Length > 0)
                {
                    address = string.Join("-", arr);
                }
            }
            catch (IOException ioex)
            {
                Console.WriteLine(ioex.StackTrace);
            }
            catch (IPv4FormatException ipex)
            {
                Console.WriteLine(ipex.StackTrace);
            }
            return address.TrimEnd("-".ToCharArray());
        }
    }