如何防止因应用程序终止而导致线程中止？

Question

如果例程通过System.Threading.Timer定期运行，如何防止该例程因主机应用程序终止而中止？

Answer 1

Well, you cannot possibly do anything if the application is terminating; however you can prevent the implicit application termination by exit from main (closing the main window, etc.) if you open a non-background thread.

You can make the timer to run at that thread, however you cannot do it with System.Threading.Timer , as it runs on thread pool threads (which are background ones). You can eg start a dispatcher on that thread and run a DispatcherTimer (if you are using WPF).

Answer 2

There is no way to guarantee that your thread won't be terminated abnormally. Any number of things can go wrong: an unexpected power failure, user terminating the application with Task Manager, or a bug in your program that crashes the thread are just three possibilities.

If you're doing a multi-stage database update that, if interrupted, would leave your database in a corrupted or inconsistent state, then you should be using transactions.

Answer 3

This code should cause the main thread to block for 10 seconds waiting for any queued timer callbacks to finish. This can be run at the exit point of the host application.

Dim waitHnd As WaitHandle = New AutoResetEvent(False)
Timer1.Dispose(waitHnd)
waitHnd.WaitOne(10000)