使用Windows服務每天晚上8點發送郵件

Question

以下代碼每3分鐘發送一次郵件。但我想每天晚上8點只發送一次郵件。如何在下面的代碼中進行設置。

我是新來的Windows服務，所以幫助我。我使用Visual Studio 2010

public partial class Scheduler : ServiceBase 
{ 
    System.Timers.Timer createOrderTimer; 
    private Timer timer1 = null; 
    public Scheduler() 
    { 
     InitializeComponent(); 
    } 

    protected override void OnStart(string[] args) 
    { 
     System.Timers.ElapsedEventHandler(this.timer1_Tick); 

     createOrderTimer = new System.Timers.Timer(); 
     createOrderTimer.Elapsed += new System.Timers.ElapsedEventHandler(GetMail); 
     createOrderTimer.Interval = 180000; 
     createOrderTimer.Enabled = true; 
     createOrderTimer.AutoReset = true; 
     createOrderTimer.Start(); 
    } 

    private void timer1_Tick(object sender, ElapsedEventArgs e) 
    { 
     Library.WriteErrorLog("Timer Ticked and some job has been done successfully"); 
    } 

    protected override void OnStop() 
    { 
     timer1.Enabled = false; 
     Library.WriteErrorLog("Test Window Service stopped"); 
    } 

    public void GetMail(object sender, System.Timers.ElapsedEventArgs args) 
    { 
     NetworkCredential cred = new NetworkCredential("abc@gmail.com", "abc"); 
     MailMessage msg = new MailMessage(); 
     msg.To.Add("to@abc.com"); 
     msg.Subject = "Welcome Venkat"; 

     msg.Body = "You Have Successfully Entered to venkat World!!!"; 
     msg.From = new MailAddress("from@gmail.com"); // Your Email Id 
     SmtpClient client = new SmtpClient("smtp.gmail.com", 587); 
     client.Credentials = cred; 
     client.EnableSsl = true; 
     client.Send(msg); 
    } 
} 

Answer 1

看一看下面的庫：http://www.quartz-scheduler.net/

有了這個，你可以安排你的任務非常easely。

你可以在這裏找到計算器的例子，即

• https://stackoverflow.com/a/13567372/849507
• https://stackoverflow.com/a/26595446/849507

Answer 2

你發送郵件每三分鐘。如果時間是每分鐘8點，你爲什麼不控制，如果是的話，發送郵件。您可以通過DateTime.Now獲得當前時間。爲了加強您的控制，您可以保留已發送郵件的日誌，並嘗試再次發送，因爲發送可能會失敗。

類似下面，但要知道，這是一個很簡單的例子，可能會導致錯誤：

public void GetMail(object sender, System.Timers.ElapsedEventArgs args) 
{ 
    if (mailSentForToday) 
     return; 

    if (DateTime.Now.Hour < 20) 
     return; 

    NetworkCredential cred = new NetworkCredential("abc@gmail.com", "abc"); 
    MailMessage msg = new MailMessage(); 
    msg.To.Add("to@abc.com"); 
    msg.Subject = "Welcome Venkat"; 

    // send the mail  
}