How to reset a timer in C#?

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.

For System.Timers.Timer, according to MSDN documentation, http://msdn.microsoft.com/en-us/library/system.timers.timer.enabled.aspx:

If the interval is set after the Timer has started, the count is reset. For example, if you set the interval to 5 seconds and then set the Enabled property to true, the count starts at the time Enabled is set. If you reset the interval to 10 seconds when count is 3 seconds, the Elapsed event is raised for the first time 13 seconds after Enabled was set to true.

So,

 const double TIMEOUT = 5000; // milliseconds aTimer = new System.Timers.Timer(TIMEOUT); aTimer.Start(); // timer start running : : aTimer.Interval = TIMEOUT; // restart the timer 

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

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

For a Timer (System.Windows.Forms.Timer).

The .Stop, then .Start methods worked as a reset.

I just assigned a new value to the timer:

mytimer.Change(10000, 0); // reset to 10 seconds

It works fine for me.

at the top of the code define the timer: System.Threading.Timer myTimer;

if (!active) myTimer = new Timer(new TimerCallback(TimerProc)); myTimer.Change(10000, 0); active = true; private void TimerProc(object state) { // The state object is the Timer object. var t = (Timer)state; t.Dispose(); Console.WriteLine("The timer callback executes."); active = false; // Action to do when timer is back to zero } 

You can do timer.Interval = timer.Interval

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(); 

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

int timerCtr = 0; bool timerElapsed = false; Timer mTimer; private void ResetTimer() => timerCtr = 0; private void mTimer_Tick() { timerCtr++; timerElapsed = timerCtr >= 10; if (timerElapsed) { // 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.

Sorry for arriving late with the answer but it might be helpful. If you need a "watchdog" kind of a timer that will start counting from zero again, use the System.Threading.Timer class and Change method.

Below is a code snippet that will only call test method if there is no interruption from the user for more than 3 seconds:

using System; using System.Threading; namespace WatchdogExample { internal class Watchdog { static void Main(string[] args) { Timer t = new Timer(timer_callback, null, 3000, Timeout.Infinite); while (true) { Console.ReadLine(); t.Change(3000, Timeout.Infinite); } } static void timer_callback(object state) { Console.WriteLine("test"); } } } 

i do this

//Restart the timer queueTimer.Enabled = true;