Raw exceptions in other C # threads

Question

Recall that Richter wrote that UnhandledException interrupts the thread in which it occurred. I tried to apply it for the experiment. I wrote this code here:

 class Program { static void ThrowException(object obj) { try { throw new Exception(); Console.Write("1");//Я знаю, что компилятор опустит эту строчку :D } catch { Console.WriteLine("--------------Exception was throwen."); throw; } } static void Main(string[] args) { Console.WriteLine("Are you ready for Tasks?"); Task.Run(() => ThrowException(null)); Thread.Sleep(1000); Console.WriteLine("Tasks OK"); Thread.Sleep(3000); Console.WriteLine("Are you ready for Threads?"); Thread thread = new Thread(() => ThrowException(null)); thread.Start(); Thread.Sleep(1000); Console.WriteLine("Threads OK"); Thread.Sleep(3000); Console.WriteLine("Are you ready for ThreadPool?"); ThreadPool.QueueUserWorkItem(ThrowException); Thread.Sleep(1000); Console.WriteLine("ThreadPool OK"); Console.ReadKey(true); } }

With Task everything works as intended, but after this "magic" with Thread application stops. I googled and still do not understand, because in Microsoft Docs written

It is not clear that there has been a situation in the process of extracting.

Why is the application closing?

@ tym32167, around this line, just the first thread has time to reach this line sometimes, while the exception is thrown.
I have no idea why the program is interrupted, although the logic should be as you have.

Zergatul Zergatul 9,136 one 12 26 · Accepted Answer · 2018-07-19T09:44:44

Unhandled exception interrupts code execution throughout the App Domain . In the case of Task.Run , the exception is not unhandled, you can see for yourself by changing the code:

 Console.WriteLine("Are you ready for Tasks?"); var result = Task.Run(() => ThrowException(null)); Thread.Sleep(1000); Console.WriteLine("Tasks OK"); Console.WriteLine("Exception: " + result.Exception); // здесь AggregateException Thread.Sleep(3000);

You will see an instance of AggregateException , and inside it is your original Exception . This means that this exception was intercepted, which means that it did not put the domain.

In the case of Thread or ThreadPool , no one catches an exception, which means it crashes the application domain.

In your quote from Microsoft Docs, there are only 3 types of exceptions: ThreadAbortException , AppDomainUnloadedException , and some internal ones. For example, if you call Thread.Abort() , then even if no one catches this exception, the application domain does not crash (otherwise what's the point of interrupting the flow). This rule does not apply to all others.

Lincupad itself is possible somewhere that something intercepts, because it does not crash.

Raw exceptions in other C # threads

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