Question

I am using a System.Threading.Timer in Windows service to execute a method periodically.
The timer fires only once, it does not fire. Can anyone please help.

Below is the code

private TimerCallback timerDelegate;

protected override void OnStart(string[] args)
{
    timerDelegate = new TimerCallback(DoWork);
    serviceTimer =  new Timer(timerDelegate, null, 1000,Timeout.Infinite);
}

private void DoWork(object state)
{
    GetMessages();
}

Answer 1

The final parameter (Timeout.Infinite) in your function call tells it to use an infinite interval between the first time it fires and each subsequent time. So it’ll fire once after 1 second and then never again. You should probably do:

serviceTimer = new Timer(timerDelegate, null, 1000, 1000);

From the documentation:

The time interval between invocations of callback, in milliseconds. Specify Timeout.Infinite to disable periodic signaling.