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.NET Forum / .NET Framework / New Users / January 2006System.Timers.Timers + WindowsService
Hi, I have problems using the timer object in a C# Windows Service In my OnStart() Method of the Windows Service I declare a timer object "Timer myTimer = 0;" Than I have a loop "for(i=0;i<=3;i++)" where I set "myTimer = new Timer;" and the Eventhandler "myTimer.Elapsed += new ElapsedEventHandler(OnTimedEvent);" Now I have four different timers running. But only the last keep running, the other three stops working after a while. And I don´t know why? Can it be that I run into a thread problem? All four timers call the same method (OnTimedEvent). First I thought I have a synchronisation problem, so I set a Lock statement around the code of the method "private static void OnTimedEvent(object source, ElapsedEventArgs e) { lock(lockvar) { //my code } }" I don´t know what´s going wrong, has anyone an idea??? Best regards Björn > Hi, > I have problems using the timer object in a C# Windows Service [quoted text clipped - 9 lines] > the other three stops working after a while. And I don´t know why? > Can it be that I run into a thread problem? No the problem is that you assign the 4 timers to the same variable... So the GC is cleaning up the 3 that are created first. (no more references to the first 3 created timers) What you should do is put those 4 references into a array of Timers of an ArrayList. something like this: Timer myTimer = 0; ArrayList myList; *** The for loop** myTimer = new Timer myTimer.Elapsed += new ElapsedEventHandler(OnTimedEvent);" myArrayList.Add(myTimer); Best Regards, Jeroen Vandezande Hi Jeroen Thx for your answer. It sounds logic and it seems to work. All four timers now working for above 15 minutes. Can I remove the Lock statement from my OnTimedEvent method? All four timers are running nearly at the same time. Every minute with a few milliseconds difference. thx Björn > > Hi, > > I have problems using the timer object in a C# Windows Service [quoted text clipped - 29 lines] > > Jeroen Vandezande > Hi Jeroen > [quoted text clipped - 5 lines] > are running nearly at the same time. Every minute with a few milliseconds > difference. I don't really know... As far as I know the Event of the timers is fired in the main thread... So I am not sure if they can run at the same time, I think he does them one at a time... Maybe someone else can help out here... I would like to know too. Best Regards, Jeroen Vandezande > Hi Jeroen > [quoted text clipped - 5 lines] > are running nearly at the same time. Every minute with a few milliseconds > difference. What does the code inside of the lock do? If the code isn't writing to any common fields or properties and not calling methods that do so, you don't need the lock. If you are doing writes to anything that isn't private to the method you will probably have to use a lock, although perhaps not at the granularity you are currently using. > thx > [quoted text clipped - 36 lines] >> >> Jeroen Vandezande Hi The code inside the lock search a private static collection for data, than calls another method which makes a select to a ms sql server. If the select returns data a Webservice is called by a Proxy class which is loaded dynamical. I believe I will continue using the lock statement, so I can´t run in trouble. Björn > > Hi Jeroen > > [quoted text clipped - 52 lines] > >> > >> Jeroen Vandezande Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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