1820: Registering for Unhandled Exceptions in Visual C#

Encoding QR in Visual C# 1820: Registering for Unhandled Exceptions
Listing 1820: Registering for Unhandled Exceptions
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using System; using SystemThreading; public class Program { public static void Main() { try { // Register a callback to // receive notifications // of any unhandled exception AppDomainCurrentDomainUnhandledException += OnUnhandledException;
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Unhandled Exceptions on the AppDomain
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ThreadPoolQueueUserWorkItem( state => { throw new Exception( "Arbitrary Exception"); }); // // Wait for the unhandled exception to fire // ADVANCED: Use ManualResetEvent to avoid // timing dependent code ThreadSleep(10000); ConsoleWriteLine("Still running"); } finally { ConsoleWriteLine("Exiting"); } } static void OnUnhandledException( object sender, UnhandledExceptionEventArgs eventArgs) { Exception exception = (Exception)eventArgsExceptionObject; ConsoleWriteLine("ERROR ({0}):{1} ---> {2}", exceptionGetType()Name, exceptionMessage, exceptionInnerExceptionMessage); } public static void ThrowException() { throw new ApplicationException( "Arbitrary exception"); } }
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OUTPUT 1810:
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Still running Exiting ERROR (AggregateException):One or more errors occurred ---> Arbitrary Exception
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18: Multithreading
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The UnhandledException callback will fire for all unhandled exceptions on threads within the application domain, including the main thread This is a notification mechanism, not a mechanism to catch and process exceptions so that the application can continue After the event, the application will exit In fact, the unhandled exception will cause the Windows Error dialog to display (Dr Watson) And for console applications, the exception will appear on the console Astute readers will note that in Listing 1820 we use ThreadPool rather than Task This is because of the likelihood that the garbage collector will not have executed on Task before the application begins to shut down and any exceptions within the finalization will be suppressed rather than going unhandled The likelihood of this case in most programs is generally low, but the best practice to avoid significant unhandled exceptions during application exit is to support task cancellation to cancel the task and wait for it to exit before shutting down the application
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SUMMARY
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This chapter delved into the details surrounding the creation and manipulation of threads using the NET Framework 4-introduced Task Parallel Library or TPL This library includes new APIs for executing for and foreach loops such that iterations can potentially run in parallel Underlying TPL is a new fundamental threading class, SystemThreading TasksTask, the basic threading unit on which all of TPL is based It provides the standard multithreaded programming and monitoring activities and keeps them relatively simple Given that Task forms the basis for parallel loops (ParallelFor() and ParallelForEach()), PLINQ, and more, it is clear that Task and its peer classes also enable a multitude of more complex threading scenarios including unhandled exception handling and Task chaining/notifications via TaskContinueWith<T> In addition, the chapter demonstrated Parallel LINQ (PLINQ) in which a single extension method, AsParallel(), transforms all further LINQ queries to run in parallel The elegance and simplicity with which this fits into the framework is superb
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The chapter closes with a section on multithreaded programming prior to TPL The foundational class for this is SystemThreadingThread, and when appropriate, static methods on ThreadPool provide efficient means for reusing Threads rather than creating new ones a relatively inefficient operation The priority order for choosing an asynchronous class is Task, ThreadPool, and Thread, resorting to a ThreadSleep(), for example, because neither Task nor ThreadPool offers an equivalent In making this evaluation, don t forget to consider using the Rx library in order to gain access to TPL and PLINQ within NET 35 There is one glaring omission from the chapter: synchronization The introduction mentioned multithreading problems such as deadlocks and race conditions, but the chapter never discussed how to avoid them This is the topic of the next chapter
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Synchronization and More Multithreading Patterns
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we discussed the details of multithreaded programming using the Task Parallel Library (TPL) and Parallel LINQ (PLINQ) One topic specifically avoided, however, was thread synchronization that prevents race conditions while avoiding deadlocks Thread synchronization is the topic of this chapter
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