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POSynchronizing a service with a timer
 

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    <p>I'm trying to write a service in c# that should be run on a given interval (a timeout) from a given date. If the date is in the future the service should wait to start until the date time is reached. </p> <p>Example: </p> <ul> <li><p>If I set a timeout to be 1 hour from 21:00:00 I want the program to run every hour</p></li> <li><p>If I set a timeout to be 1 hour from 3999.01.01 21:00:00 I want the program to until date and from then run each hour</p></li> </ul> <p><strong>I have sort of achieved that with the following code, but it has some problems!</strong></p> <ol> <li><p>When I install the service (with installutil) the service is marked as <em>starting</em> because of the 'Thread.Sleep()'. This service appears to be hanging and is "installing" until started.</p></li> <li><p>The code inside 'ServiceTimer_Tick()' might take longer than the expected timeout. How can I prevent the timer stack from increasing if that happens? </p></li> </ol> <p>Alternatives I've thought of :</p> <ul> <li><p>include using the 'timeout.Interval' first time and then resetting it subsequent calls, but it doesn't feel right. </p></li> <li><p>I've also considered ditching the entire service idea and compile it as a executable and set up a scheduled tasks.</p></li> </ul> <p>Shortened example: </p> <pre><code>public Service() { _timeout = new TimeSpan(0,1,0,0); _timer = new System.Timers.Timer(); _timer.Interval = _timeout.TotalMilliseconds; _timer.Elapsed += new ElapsedEventHandler(ServiceTimer_Tick); } private void ServiceTimer_Tick(object sender, System.Timers.ElapsedEventArgs e) { lock (_obj) { // Stuff that could take a lot of time } } public static void Main() { Run(new Service()); } protected override void OnStart(string[] args) { long current = DateTime.Now.Ticks; long start = new DateTime(2010,9,15,21,0,0).Ticks; long timeout = _timeout.Ticks; long sleep; if (current &gt; start) sleep = timeout - ((current % timeout)) + (start % timeout); else sleep = start - current; Thread.Sleep(new TimeSpan(sleep)); _timer.AutoReset = true; _timer.Enabled = true; _timer.Start(); } </code></pre>
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    1. COI don't really understand what you're tying to achieve. Year 3999? What does the timeout do? .... This may be related: [How to generate event on a specific time of clock in C#?](http://stackoverflow.com/questions/1297109)
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    2. COI just set a date/year that would be obviously in the future - instead it confused you and probably many others.
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