.NET定时发送邮件

添加一个全局应用程序类Global.asax

代码会在访问网站时运行

Global.asax代码：

     void Application_Start(object sender, EventArgs e)
     {
         // 在应用程序启动时运行的代码
         System.Timers.Timer timer = new System.Timers.Timer();//设计时间间隔，如果一个小时执行一次就改为3600000
         timer.Elapsed += new System.Timers.ElapsedEventHandler(Send);
         timer.AutoReset = true;
         timer.Enabled = true;
     }

     void Application_End(object sender, EventArgs e)
     {
         //  在应用程序关闭时运行的代码
         System.Threading.Thread.Sleep();
         string strUrl = "服务器地址";
         System.Net.HttpWebRequest _HttpWebRequest = (System.Net.HttpWebRequest)System.Net.WebRequest.Create(strUrl);
         System.Net.HttpWebResponse _HttpWebResponse = (System.Net.HttpWebResponse)_HttpWebRequest.GetResponse();
         System.IO.Stream _Stream = _HttpWebResponse.GetResponseStream();//得到回写的字节流
         _HttpWebResponse.Close();
     }

     void Application_Error(object sender, EventArgs e)
     {
         // 在出现未处理的错误时运行的代码

     }

     void Session_Start(object sender, EventArgs e)
     {
         // 在新会话启动时运行的代码

     }

     void Session_End(object sender, EventArgs e)
     {
         // 在会话结束时运行的代码。
         // 注意: 只有在 Web.config 文件中的 sessionstate 模式设置为
         // InProc 时，才会引发 Session_End 事件。如果会话模式设置为 StateServer
         // 或 SQLServer，则不引发该事件。

     }

     private void Send(object sender, System.Timers.ElapsedEventArgs e)
     {
         switch (DateTime.Now.Hour)
         {
             case :
             case :
                 SendEMail();
                 break;
             //default:
             //    SendEMail();
             //    break;
         }
     }
     private void SendEMail()
     {
         string mailFrom = System.Configuration.ConfigurationManager.AppSettings["MailFrom"].ToString();
         string mailUser = System.Configuration.ConfigurationManager.AppSettings["MailUser"].ToString();
         string mailPassword = System.Configuration.ConfigurationManager.AppSettings["MailPassword"].ToString();
         string hostIP = System.Configuration.ConfigurationManager.AppSettings["MailHost"].ToString();

         List<string> mailAddress = new List<string>();
         string mailSubjct = "邮件主题";    
           string mailBody = "邮件内容:"；
           mailAddress.Add("邮件地址");string strReturn = sendMail(mailSubjct, mailBody, mailFrom, mailAddress, hostIP, mailUser, mailPassword, false);
     }

sendMail方法

 public static string sendMail(string mailSubjct, string mailBody, string mailFrom, List<string> mailAddress, string hostIP, string username, string password, bool ssl)
         {
             string str = "";
             try
             {
                 MailMessage message = new MailMessage
                 {
                     IsBodyHtml = true,
                     Subject = mailSubjct,
                     Body = mailBody,

                     From = new MailAddress(mailFrom)
                 };
                 for (int i = ; i < mailAddress.Count; i++)
                 {
                     message.To.Add(mailAddress[i]);
                 }
                 SmtpClient client = new SmtpClient
                 {
                     EnableSsl = ssl,
                     UseDefaultCredentials = false
                 };
                 NetworkCredential credential = new NetworkCredential(username, password);
                 client.Credentials = credential;
                 client.DeliveryMethod = SmtpDeliveryMethod.Network;
                 client.Host = hostIP;
                 client.Port = 0x19;
                 client.Send(message);
             }
             catch (Exception exception)
             {
                 str = exception.Message;
             }
             return str;
         }