定时发邮件

首先要在Global.asax写个定时方法

protected void Application_Start()
        {
            //在应用程序启动时运行的代码  
            //定义定时器  
            System.Timers.Timer myTimer = new System.Timers.Timer(180000);//3分钟

　　　　//　　myTimer_Elapsed定时方法
            myTimer.Elapsed += new ElapsedEventHandler(myTimer_Elapsed);
            myTimer.AutoReset = true;//设置是执行一次（false）还是一直执行(true);  
            myTimer.Enabled = true;//是否执行System.Timers.Timer.Elapsed事件;  
            AreaRegistration.RegisterAllAreas();
            RouteConfig.RegisterRoutes(RouteTable.Routes);

        }

然后在定时方法里面写事件

 void myTimer_Elapsed(object source, ElapsedEventArgs e)
         {
            try
            {
                XHSHEEntities db = new XHSHEEntities();
                var list = new SEmailServices().LoadEntities(a => a.state == 0).OrderBy(a => a.Cretatime);
                int times = (int)new EmailConcentServices().ViewEntity(a => a.Id == 1).timer;
                var title = new EmailConcentServices().ViewEntity(a => a.Id == 1).Title;
                var concent = new EmailConcentServices().ViewEntity(a => a.Id == 1).Concent;
                if (list.Count() != 0)
                {
                    foreach (var item in list)
                    {
                        DateTime dt1 = (DateTime)item.Cretatime;
                        DateTime dt3 = dt1.AddMinutes(times);
                        DateTime dt2 = DateTime.Now;

                        if (dt2 > dt3)
                        {
                            var flist = new SendMailServices().LoadEntities().OrderBy(a => a.FCount).FirstOrDefault();
                            var faemail = flist.FaMailAddress;
                            var fapwd = flist.pwd;
                            var smtp = flist.SMTP;
                            var fcount = flist.FCount;
                            string str = "23456789qwertyuipasddfghjklzxcvbnm";
                            Random r = new Random();
                            string ecrode = "";
                            for (int i = 0; i < 4; i++)
                            {
                                var idx = r.Next(0, str.Length);
                                ecrode += str.ToArray()[idx];
                            }
                            var filepath = new FilesServices().ViewEntity(a => a.Id == item.FileId).FilePath;
                            TiEmail ti = new TiEmail();
                            ti.Createime = DateTime.Now.AddHours(24);
                            ti.FilePath = filepath;
                            ti.ercode = ecrode;
                            new TiEmailServices().AddEntity(ti);
                            var concents = concent + "【您的提取码是" + ecrode + "】<a href ='http://118.126.18.31:8022/BBS/TQ'>【请点击下载全文.......】</a>";
                            //发送邮件 其他根据需求写

　　　　　　　　　　ps:参数，Semailadress：收件人，faemail：发件人，fapwd：发件人密码，smtp：邮箱服务，faemail：邮件名称，title：邮件标题，concents：邮件内容
                            SendMail(item.Semailadress, faemail, fapwd, smtp, faemail, title, concents);
                            new SEmailServices().Update(a => a.Id == item.Id, b => new SEmail
                            {
                                state = 1,
                            });
                            new SendMailServices().Update(a => a.Id == flist.Id, b => new SendMail
                            {
                                FCount = flist.FCount + 1,
                            });
                            int? uploadis = new FilesServices().ViewEntity(a => a.Id == item.FileId).IsDownload;
                            new FilesServices().Update(a => a.Id == item.FileId, b => new Files()
                            {
                                IsDownload = uploadis + 1,
                            });
                        }
                    }
                }
            }

            catch (Exception ex)
            {
                throw new Exception(ex.Message, ex);
            }

        }

//发邮件的方法

ps:我写的是可以切换不同的发件人来发邮件，所以加了个判断

public void SendMail(string toEmailAddress, string faEmailAddress, string emailpwd, string smtp, string faname, string emailTitle, string emailBody)
        {
            try
            {
                System.Net.Mail.SmtpClient client = new System.Net.Mail.SmtpClient(smtp);
                client.UseDefaultCredentials = false;

　　　　　　//不同发件人的判断
                if (smtp.Contains("qq"))
                {
                    client.EnableSsl = true;
                }
                else
                {
                    client.EnableSsl = false;
                }
                client.Credentials = new System.Net.NetworkCredential(faEmailAddress, emailpwd);
                client.DeliveryMethod = SmtpDeliveryMethod.Network;
                MailMessage message = new System.Net.Mail.MailMessage();
                message.From = new MailAddress(faEmailAddress, faname, Encoding.UTF8);
                //群发对象
                string[] emails = toEmailAddress.Split(';');
                for (int i = 0; i < emails.Length; i++)
                {
                    message.To.Add(emails[i]);
                }
                //标题
                message.Subject = emailTitle;
                //内容
                message.Body = emailBody;
                message.BodyEncoding = System.Text.Encoding.UTF8;
                message.IsBodyHtml = true;
                client.Send(message);

            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message, ex);
            }
        }