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How do I catch a StackOverflowException?
I have a program that allows the user to write scripts, and when running arbitrary user-code I may get a StackOverflowException. The piece running user code is obviously surrounded with a try-catch, but stack overflows are uncatchable under normal circumstances.
I've looked around and this is the most informative answer I could find, but still led me to a dead end; from an article in the BCL team's blog I found that I should use RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup to call the code and the delegate that would get called even after a stack overflow, but when trying, the process gets terminated with the stack overflow message without the delegate ever getting called. I've tried adding PrePrepareMethodAttribute on the handler method but that didn't change anything.
I've also tried using an AppDomain and handling both the UnhandledException and the DomainUnload event - but the entire process gets killed on stack overflows. The same happens even if I throw new StackOverflowException(); manually and not get an actual stack overflow.
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NET Framework 2.0, you can't catch a StackOverflowException object with a try / catch block, and the corresponding process is terminated by default. Consequently, you should write your code to detect and prevent a stack overflow.
StackOverflowError is an error which Java doesn't allow to catch, for instance, stack running out of space, as it's one of the most common runtime errors one can encounter.
StackOverflowException is thrown for execution stack overflow errors, typically in case of a very deep or unbounded recursion. So make sure your code doesn't have an infinite loop or infinite recursion. StackOverflowException uses the HRESULT COR_E_STACKOVERFLOW, which has the value 0x800703E9.
A StackOverflowException is thrown when the execution stack overflows because it contains too many nested method calls. using System; namespace temp { class Program { static void Main(string[] args) { Main(args); // Oops, this recursion won't stop. } } }
To handle an exception that is not handled by your code, you can subscribe to the AppDomains UnhandledException -- which is what the operating system handles when it displays the dialog that says the program exited unexpectedly.
In the Main method of your program use
var currentDomain = AppDomain.CurrentDomain;
and then add a handler to the event
currentDomain.UnhandledException += handler;
In the handler you can do anything you want, such as log, display an error, or even reinitializing the program if desired.
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