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Threading.Timer is for server processing although I have to say I don't know that I ever use it myself. There are at least 3 in the BCL: System.Timers, System.Threading and. Timers are confusing so I'll try to summarize. Other threads will continue to work apart from that. Instead the service continues to run as if nothing happened but the thread which called this function will never work again. A NullReferenceException is thrown but my UnhandledExceptionHandler is not called. Then in the catch block is called with SqlCmd.Transaction being 'null'. static internal void SynchronizeIDDSRepositoryWithRmxDB() Let's say the exception occurs at () because of a suddenly unavailable DB server. The service runs just fine apart from that. The service will not terminate but it seems like the thread in which the unhandled exception occurs is "destroyed" and cannot be called again. If I run with an attached Visual Studio Debugger, the exception is thrown but not handled, certainly not by my own code. So if your service isn't terminating prematurely then it is being handled. I don't use WinForms.Īs of v2 an unhandled exception in any thread will terminate the application. However the handler might get called outside the interval defined by the timer so the handler still has to do some time management. However it does not need to be reentrant because the message queue is serialized. Since it goes through the message queue it is not guaranteed accurate because the UI might be busy doing other things. It relies on the standard WM_TIMER message for processing. The event handler must be reentrant as well. Since most events are not set up to handle exceptions the class wraps the entire call in a try-catch. But your event handler can throw an exception. The only real difference is that this version raises an event when the timer elapses rather than calling a method. Actually this version uses Threading.Timer internally to do the work.
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The work is done on an arbitrary thread as well. Timers.Timer is also for server processing. Callbacks have to be reentrant because the timer can fire before the last one finishes processing.
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If the callback (running on an arbitrary thread) has an unhandled exception then you'll know about it. It basically just calls the callback you method at the appropriate intervals.