How to reset a timer in C#?

monoxide_15537 0
Viewed 204847

There are three Timer classes that I am aware of, System.Threading.Timer, System.Timers.Timer, and System.Windows.Forms.Timer, but none of these have a .Reset() function which would reset the current elapsed time to 0.

Is there a BCL class that has this functionality? Is there a non-hack way of doing it? (I thought perhaps changing the time limit on it might reset it) Thought on how hard it would be to reimplement a Timer class that had this functionality, or how to do it reliably with one of the BCL classes?

timer c#
10 Answers

I always do ...

myTimer.Stop();
myTimer.Start();

... is that a hack? :)

Per comment, on Threading.Timer, it's the Change method ...

dueTime Type: System.Int32 The amount of time to delay before the invoking the callback method specified when the Timer was constructed, in milliseconds. Specify Timeout.Infinite to prevent the timer from restarting. Specify zero (0) to restart the timer immediately.

user_864730

All the timers have the equivalent of Start() and Stop() methods, except System.Threading.Timer.

So an extension method such as...

public static void Reset(this Timer timer)
{
  timer.Stop();
  timer.Start();
}

...is one way to go about it.

user_131320

You could write an extension method called Reset(), which

  • calls Stop()-Start() for Timers.Timer and Forms.Timer
  • calls Change for Threading.Timer
Gishu_16950

I do the following. Disposing the timer and initializing it again. But this will erase any event you attached to this timer.

timer.Dispose();
timer = new System.Timers.Timer();
user_121963490

Other alternative way to reset the windows.timer is using the counter, as follows:

int timerCtr = 0;
Timer mTimer;

private void ResetTimer() => timerCtr = 0;
private void mTimer_Tick()
{
    timerCtr++;
    // Perform task
}

So if you intend to repeat every 1 second, you can set the timer interval at 100ms, and test the counter to 10 cycles.

This is suitable if the timer should wait for some processes those may be ended at the different time span.

user_2328050
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