c# 获取公网ip 示例源码

using System;using System.Collections.Generic;using System.Text;using System.Net;using System.IO;using System.Net.Mail;using System.Threading;namespace GetIp{ class Program { static void Main(string[] args) { string OriginalIp = string.Empty; while (true) { string myIp = string.Empty; try { myIp = GetWebContent("http://www.3322.org/dyndns/getip"); } catch (Exception ex) { Util.Adr_LogManager.WriteLog(Util.LogType.Warning, "获取IP出错：" ex.Message); myIp = string.Empty; } if (myIp != string.Empty && OriginalIp != myIp) { OriginalIp = myIp; Console.Write(DateTime.Now.ToString() " >> 您的IP地址是：" myIp); SendEmail(myIp); } Thread.Sleep(1000 * 60); } ///Console.ReadLine(); } private static string GetWebContent(string sUrl) { string strResult = ""; try { HttpWebRequest request = (HttpWebRequest)WebRequest.Create(sUrl); //声明一个HttpWebRequest请求 request.Timeout = 3000000; //设置连接超时时间 request.Headers.Set("Pragma", "no-cache"); HttpWebResponse response = (HttpWebResponse)request.GetResponse(); if (response.ToString() != "") { Stream streamReceive = response.GetResponseStream(); Encoding encoding = Encoding.GetEncoding("UTF-8"); StreamReader streamReader = new StreamReader(streamReceive, encoding); strResult = streamReader.ReadToEnd(); } } catch (Exception exp) { strResult = ""; } return strResult; } static void SendEmail(string ip) { MailMessage mail = new MailMessage(); mail.From = new MailAddress( "heuandmei@qq.com", "成都服务器IP地址", Encoding.UTF8); mail.To.Add("heuandmei@qq.com,jekey.sinotop@foxmail.com,271134337@qq.com"); mail.Subject = "成都服务器IP地址变更" DateTime.Now.ToString(); mail.SubjectEncoding = Encoding.Default; mail.Body = "IP地址已变更为：" ip; mail.BodyEncoding = Encoding.Default; mail.IsBodyHtml = false; mail.Priority = MailPriority.Normal; SmtpClient client = new SmtpClient(); client.Host = "smtp.qq.com"; client.Port = 25; //是否使用安全套接字层加密连接 client.EnableSsl = false; //不使用默认凭证，注意此句必须放在 client.Credentials 的上面 client.UseDefaultCredentials = false; client.Credentials = new NetworkCredential("heuandmei@qq.com", "meandmei"); //邮件通过网络直接发送到服务器 client.DeliveryMethod = SmtpDeliveryMethod.Network; try { client.Send(mail); Util.Adr_LogManager.WriteLog(Util.LogType.Trace, "发信成功"); } catch (SmtpException ex) { Util.Adr_LogManager.WriteLog(Util.LogType.Trace, "发信失败（1）：" ex.Message); } catch (Exception ex) { Util.Adr_LogManager.WriteLog(Util.LogType.Trace, "发信失败（2）：" ex.Message); } finally { mail.Dispose(); client = null; } } }}