CODEWITHSUNDEEP
c#timer
leventkalay92
leventkalay92

Reputation: 585

Why does my use of System.Threading.Timer not work?

I'm trying to execute a function periodically, using a System.Threading.Timer. It calls the function, but it doesn't work, and doesn't report an error. Why?

 public class Timerr
 {
    ArrayList listurl;
    ArrayList listcategory;
    protected Collection<Rss.Items> list = new Collection<Rss.Items>();
    RssManager reader = new RssManager();
    System.Threading.Timer Timer;
    System.DateTime StopTime;
    public void Run()
    {
        StopTime = System.DateTime.Now.AddMinutes(1);
        Timer = new System.Threading.Timer(TimerCallback, null, 0,1000);
    }

    private void TimerCallback(object state)
    {
        if (System.DateTime.Now >= StopTime)
        {
            Timer.Dispose();
            return;
        }
        callrss();
    }
}

Upvotes: 4

Views: 3495

Answers (2)

Ohad Schneider
Ohad Schneider

Reputation: 38112

This works in LINQPad:

void Main()
{
    var t = new Timerr();
    t.Run();

    Thread.Sleep(60000);
}

public class Timerr
 {
    System.Threading.Timer Timer;
    System.DateTime StopTime;
    public void Run()
    {
        StopTime = System.DateTime.Now.AddMinutes(1);
        Timer = new System.Threading.Timer(TimerCallback, null, 0,1000);
    }

    private void TimerCallback(object state)
    {
        if (System.DateTime.Now >= StopTime)
        {
            Timer.Dispose();
            return;
        }
        Console.WriteLine("Hello");
    }
}

I recommend you install the free LINQPad with which you can check such things very quickly, without the need to run your entire application

Upvotes: 1

jason
jason

Reputation: 241641

Did you construct an instance of Timerr? Did you call Run on that instance? Did you keep that instance around so that the timer isn't GCed (System.Threading.Timers aren't automatically rooted, like System.Timers.Timers are)? Do you have some busy loop or some other way of keeping your process alive long enough to allow the timer callback to be invoked?

Upvotes: 1

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