C#获取外网IP地址;C#获取所在IP城市地址

public static string GetIP()

        {

            using (var webClient = new WebClient())

            {

                try

                {

                    var temp = webClient.DownloadString("http://iframe.ip138.com/ic.asp");

                    var ip = Regex.Match(temp, @"\[(?<ip>\d+\.\d+\.\d+\.\d+)]").Groups["ip"].Value;

                    return !string.IsNullOrEmpty(ip) ? ip : null;

                }

                catch (Exception ex)

                {

                    return ex.Message;

                }

            }

        }

　　

//表单验证

        $(function () {





            var ip = $.trim($("#hidLocalIp").val()); // "218.4.255.91";

            $.getScript('http://int.dpool.sina.com.cn/iplookup/iplookup.php?format=js&ip=' + ip, function (_result) {

                if (remote_ip_info.ret == "1") {

                    $("#hidArea").val(ip + ";" + remote_ip_info.country + ";" + remote_ip_info.province + ";" + remote_ip_info.city + ";" + remote_ip_info.isp + ";");

                    //alert(ip + ";" + remote_ip_info.country + ";" + remote_ip_info.province + ";" + remote_ip_info.city + ";" + remote_ip_info.isp + ";"); 

                }

            }); 

        });