.NET使用System.Timers.Timer类实现程序定时执行 .NET使用System.Timers.Timer类实现程

【.NET使用System.Timers.Timer类实现程序定时执行】在C#里关于定时器类有3个：System.Windows.Forms.Timer类、System.Threading.Timer类和System.Timers.Timer类。
System.Windows.Forms.Timer是应用于WinForm中的，它是通过Windows消息机制实现的，类似于VB或Delphi中的Timer控件，内部使用APISetTimer实现的。它的主要缺点是计时不精确，而且必须有消息循环，ConsoleApplication(控制台应用程序)无法使用。
System.Timers.Timer和System.Threading.Timer非常类似，它们是通过.NET Thread Pool实现轻量、精确的计时，对应用程序、消息没有特别的要求。System.Timers.Timer还可以应用于WinForm，完全取代上面的Timer控件。它们的缺点是不支持直接的拖放，需要手工编码。

public int wrong = 0; System.Timers.Timer time = new System.Timers.Timer(); private void begin_Click(object sender, EventArgs e){if (action.Text == "启动监测"){action.Text = "停止监测"; label2.Text = "已启动"; if (time.Interval.ToString() == "100") // The default value of interval is 100s.{time.Elapsed += new ElapsedEventHandler(TimeEvent); time.Interval = 1000; }time.Enabled = true; }else{action.Text = "启动监测"; label2.Text = "已停止"; time.Enabled = false; }}private static void TimeEvent(object source, ElapsedEventArgs e){int tsec = e.SignalTime.Second; int isec = 10; if (tsec == isec) //it will be activated at 10s of every minutes.{if (!Check("http://www.test.com")){string smtp_server="192.168.8.1"; int port = 25; string mail_from = "test_from@163.com"; string sender="test"; string mail_to = "test_to@163.com"; string receiver="adminer"; string subject = "The site is run out exception on " + DateTime.Now.ToString("yyyyMMddhhmmss"); string body = "The site can not open on " + DateTime.Now.ToString() + ",please check it !"; try{SendEmail(smtp_server, port, mail_from, sender, mail_to, receiver, subject, body); }catch(Exception ex){MessageBox.Show(ex.Message); }}}}private static bool Check(string urlStr){HttpWebRequest myWebRequest = null; try{myWebRequest = (HttpWebRequest)WebRequest.Create(urlStr); HttpWebResponse res = (HttpWebResponse)myWebRequest.GetResponse(); if (res.StatusCode == HttpStatusCode.OK){res.Close(); return true; }else{res.Close(); return false; }}catch (Exception){return false; }}public static void SendEmail(string smtp_server, int port, string mail_from, string sender, string mail_to, string receiver, string subject, string body){MailAddress from = new MailAddress(mail_from, sender); MailAddress to = new MailAddress(mail_to, receiver); MailMessage message = new MailMessage(from, to); message.BodyEncoding = Encoding.UTF8; message.IsBodyHtml = true; message.Subject = subject; message.Body = body; SmtpClient client = new SmtpClient(smtp_server, port); //SmtpClient client = new SmtpClient(smtp_server); // Add credentials if the SMTP server requires them. client.Credentials = CredentialCache.DefaultNetworkCredentials; client.Send(message); }

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