CODEWITHSUNDEEP
c#
Nay Lin Aung
Nay Lin Aung

Reputation: 745

To raise an event every hour has passed in system clock

I want to raise an event every time each hour has passed in system clock. For example, I run my program at 7:45 am then the event should be raised at 8:00 am, not at 8:45 am. After the event raised at 8:00 am, then this event should be raised at every hour 9:00 am, 10:00 am, 11:00 am, etc...

Can anyone help me to show some code... I use C#.net... Thanks in advance...

UPDATE:

Now I get the simple solution for my question. Therefore I would like to share this solution. lboshuizen's answer is already correct. My answer is same logic with lboshuizen's answer but more detail and exact.

Firstly it needs to use Timer. Timer basically works based on milliseconds which sometimes needs additional calculation. Therefore, I would like to implement milliseconds to minute formatting function as first. 

int CalculateMillisecondUntilNextHour()
{
     int REMAIN_MINUTE = 60 - DateTime.Now.Minute;
     DateTime now = DateTime.Now;
     DateTime nexthour = now.AddMinutes((minute)).AddSeconds(now.Second * -1).AddMilliseconds(now.Millisecond * -1);

     TimeSpan interval = nexthour - now;
     return (int)interval.TotalMilliseconds;
}

void CheckEachHourPassed()
{
     System.Windows.Forms.Timer t = new System.Windows.Forms.Timer();
     t.Interval = CalculateMillisecondUntilNextHour();
     t.Tick += new EventHandler(t_Tick);
     t.Enabled = true;
}

void t_Tick(object sender, EventArgs e)
{
     MessageBox.Show("Raise Your Event");
     t.Interval = CalculateTimerInterval(REMAIN_MINUTE);
}

At here, the main working function is CheckEachHourPassed(). Call this function where you want to start your event scheduler.

Upvotes: 0

Views: 2730

Answers (3)

JML
JML

Reputation: 382

The problem is that the 

timer.Every().Minutes(60).Execute(() => Code());

over time may actually get out of sync with the real time.

How about running this in a thread

var lastMoment = DateTime.Now;
while(true)
   if(DateTime.Now.Hour != lastMoment.Hour)
   {
       //Raise ElaspedHourEvent
       //Thread.Sleep(1000);
   ]

it might not fire the event until at most a second after the hour but at least it won't get out of sync.

Upvotes: 0

lboshuizen
lboshuizen

Reputation: 2786

Pseudo code (implementation is left as an excercise to the reader)

var currentTime = Time.Now()
var deltaMinutes  = Calculate_minutes_till_next_full_hour(currentTime);
wait(deltaMinutes);
var timer = new timer();
timer.Every().Minutes(60).Execute(() => Code());

Upvotes: 1

Aghilas Yakoub
Aghilas Yakoub

Reputation: 28980

You can use Timer by fixing Interval property

Link : http://msdn.microsoft.com/fr-fr/library/system.timers.timer.aspx

Upvotes: 0

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