通过ip地址获取城市

 

public bool IsExitCityByIP(string ip,out string city)         {   

                string[] ips = ip.Split('.');

               double ipNum = Convert.ToDouble(ips[0]) * 16777216 + Convert.ToDouble(ips[1]) * 65536 + Convert.ToDouble(ips[2]) * 256 + Convert.ToDouble(ips[3]);

                string[] cityName = { "Shenzhen", "Shanghai", "Guangzhou", "Hong Kong" };

                IPGroupCity c = GetAddressByIPNum(ipNum);

                city = c.City.ToString();

                if (city != null)计算

                {

                    for (int i = 0; i < cityName.Length; i++)

                    {                         if (cityName[i].Equals(city))

                        {                             lblAddress.Text = "您查询的IP：" + txtIP.Text + "<br>IP地址位置：" + c.Country_name + "--" + city;

                            return true;                         }  

                       else if (cityName[i].Equals(c.Country_name))

                        {                             lblAddress.Text = "您查询的IP：" + txtIP.Text + "<br>IP地址位置：" + c.Country_name + "--" + city;

                            return true;   

                      }   

                  }  

                   lblAddress.Text = "您查询的IP：" + txtIP.Text + "<br>IP地址位置：" + c.Country_name + "--" + city + "!   您没有在OpenRice所涉足的五个城市内 ";                     return false;                 }   

              else

                {  

                   ScriptManager.RegisterStartupScript(this, this.GetType(), "", "alert('您输入的IP没有相关记录')", true); 

                      return false;                 }     

                     }