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.NET使用System.Timers.Timer類實現(xiàn)程序定時執(zhí)行

更新時間：2022年07月12日 10:00:09 作者：夢想天空

這篇文章介紹了.NET使用System.Timers.Timer類實現(xiàn)程序定時執(zhí)行的方法，文中通過示例代碼介紹的非常詳細(xì)。對大家的學(xué)習(xí)或工作具有一定的參考借鑒價值，需要的朋友可以參考下

在C#里關(guān)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(yīng)用于WinForm中的，它是通過Windows消息機(jī)制實現(xiàn)的，類似于VB或Delphi中的Timer控件，內(nèi)部使用API SetTimer實現(xiàn)的。它的主要缺點是計時不精確，而且必須有消息循環(huán)，Console Application(控制臺應(yīng)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(xiàn)輕量、精確的計時，對應(yīng)用程序、消息沒有特別的要求。System.Timers.Timer還可以應(yīng)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(jiān)測")
            {
                action.Text = "停止監(jiān)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(jiān)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);
        }

以上就是本文的全部內(nèi)容，希望對大家的學(xué)習(xí)有所幫助，也希望大家多多支持腳本之家。

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