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A task can complete in one of three ways: it can run to completion, it can be canceled, or it can fault. The Task object s TaskStatus property reflects this through RanToComple tion, Canceled, and Faulted values, respectively, and if the task enters the Faulted state, its IsFaulted property also becomes true. A code-based task will enter the Faulted state if its method throws an exception. You can retrieve the exception information from the task s Exception property. This returns an AggregateException, which contains a list of exceptions in its InnerExceptions property. It s a list because certain task usage patterns can end up hitting multiple exceptions; for example, you might have multiple failing child tasks.

It was a complete waste of time; it absorbed a lot of time very early on, critically A third example of this was when we said, Let s make some kind of coupon system because we had this idea that we would send people an automatic email when they visited our website that would tell them and we had all these crazy ideas like, Buy our software within the next 72 hours and get 25 percent off (That thing was actually a bot that we wrote years ago, and it still runs If you try CityDesk, which is our least popular product right now, you will get an.

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If you don t check the IsFaulted property and instead just attempt to proceed, either by calling Wait or by attempting to fetch the Result of a Task<TResult>, the Aggrega teException will be thrown back into your code It s possible to write code that never looks for the exception Example 16-17 starts two tasks, and since it ignores the Task objects returned by StartNew, it clearly never does anything more with the tasks If they were children of another task that wouldn t matter if you ignore exceptions in child tasks they end up causing the parent task to fault But these are not child tasks, so if exceptions occur during their execution, the program won t notice.

automatic email with a 25 percent off coupon that you have to use in the next 72 hours) When we launched that, it did increase our sales a little bit It gets people to evaluate the demo version right away because they don t want to lose their 25 percent off coupon which is going to expire These were all marginally good marketing ideas Unfortunately we spent a lot of time chasing them The one thing we learned over 5 years is that nothing works better than just improving your product Every minute, every developer hour we spent on any one of these crazy things although they had some marginal return on the work that we put into them was nothing compared to just making a better version of the product and releasing it.

However, the TPL tries hard to make sure you don t ignore such exceptions it uses a feature of the garbage collector called finalization to discover when a Task that faulted is about to be collected without your program ever having noticed the exception When it detects this, it throws the AggregateException, which will cause your program to crash unless you ve configured your process to deal with unhandled exceptions (The NET Framework runs all finalizers on a dedicated thread, and it s this thread that the TPL throws the exception on) The TaskScheduler class offers an UnobservedTaskException event that lets you customize the way these unhandled exceptions are dealt with The upshot is that you should write error handling for any nonchild tasks that could throw One way to do this is to provide a continuation specifically for error handling.

The ContinueWith method takes an optional argument whose type is the TaskContinua tionOptions enumeration, which has an OnlyOnFaulted value you could use this to build a continuation that will run only when an unanticipated exception occurs (Of course, unanticipated exceptions are always bad news because, by definition, you weren t expecting them and therefore have no idea what state your program is in So you probably need to terminate the program, which is what would have happened anyway if you hadn t written any error handling However, you do get to write errors to your logs, and perhaps make an emergency attempt to write out unsaved data somewhere in the hope of recovering it when the program restarts) But in general, it s preferable to handle errors by putting normal try...

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