Use the System. Timers. Timer class to implement regular Program Execution

In C #, there are three Timer classes: System. Windows. Forms. Timer, System. Threading. Timer, and System. Timers. Timer.

System. Windows. Forms. Timer is used in WinForm. It is implemented through the Windows message mechanism. Similar to the Timer control in VB or Delphi, it is implemented using the API SetTimer internally. Its main disadvantage is that the timing is not accurate and there must be a message loop, which cannot be used by the Console Application.

System. Timers. Timer is very similar to System. Threading. Timer. They use the. NET Thread Pool to implement lightweight and accurate timing, with no special requirements on applications and messages. System. Timers. Timer can also be used in WinForm to completely replace the above Timer control. Their disadvantage is that they do not support direct drag and drop and require manual encoding.

Public int wrong = 0;
System. Timers. Timer time = new System. Timers. Timer ();

Private void begin_Click (object sender, EventArgs e)
{
If (action. Text = "enable monitoring ")
{
Action. Text = "Stop monitoring ";
Label2.Text = "started ";

If (time. Interval. ToString () = "100") // The default value of interval is 100 s.
{
Time. Elapsed + = new ElapsedEventHandler (TimeEvent );
Time. Interval = 1000;
}
Time. Enabled = true;
}
Else
{
Action. Text = "enable monitoring ";
Label2.Text = "STOPPED ";

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 10 s 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 explorer = "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 er, string subject, string body)
{
MailAddress from = new MailAddress (mail_from, sender );
MailAddress to = new MailAddress (mail_to, receiver );
MailMessage message = new MailMessage (from, );
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 );
}