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這篇文章主要講解了“.NET怎么使用System.Timers.Timer類實現程序定時執行”,文中的講解內容簡單清晰,易于學習與理解,下面請大家跟著小編的思路慢慢深入,一起來研究和學習“.NET怎么使用System.Timers.Timer類實現程序定時執行”吧!
在C#里關于定時器類有3個:System.Windows.Forms.Timer類、System.Threading.Timer類和System.Timers.Timer類。
System.Windows.Forms.Timer是應用于WinForm中的,它是通過Windows消息機制實現的,類似于VB或Delphi中的Timer控件,內部使用API SetTimer實現的。它的主要缺點是計時不精確,而且必須有消息循環,Console Application(控制臺應用程序)無法使用。
System.Timers.Timer和System.Threading.Timer非常類似,它們是通過.NET Thread Pool實現輕量、精確的計時,對應用程序、消息沒有特別的要求。System.Timers.Timer還可以應用于WinForm,完全取代上面的Timer控件。它們的缺點是不支持直接的拖放,需要手工編碼。
public int wrong = 0; System.Timers.Timer time = new System.Timers.Timer(); private void begin_Click(object sender, EventArgs e) { if (action.Text == "啟動監測") { action.Text = "停止監測"; label2.Text = "已啟動"; 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 = "啟動監測"; 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); }
感謝各位的閱讀,以上就是“.NET怎么使用System.Timers.Timer類實現程序定時執行”的內容了,經過本文的學習后,相信大家對.NET怎么使用System.Timers.Timer類實現程序定時執行這一問題有了更深刻的體會,具體使用情況還需要大家實踐驗證。這里是億速云,小編將為大家推送更多相關知識點的文章,歡迎關注!
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