When a debugger is attached to a .NET process, it (usually) stops when an unhandled exception is thrown.
However, this doesn't seem to work when you're in an async
method.
The scenarios I've tried before are listed in the following code:
class Program { static void Main() { // Debugger stopps correctly Task.Run(() => SyncOp()); // Debugger doesn't stop Task.Run(async () => SyncOp()); // Debugger doesn't stop Task.Run((Func<Task>)AsyncTaskOp); // Debugger stops on "Wait()" with "AggregateException" Task.Run(() => AsyncTaskOp().Wait()); // Throws "Exceptions was unhandled by user code" on "await" Task.Run(() => AsyncVoidOp()); Thread.Sleep(2000); } static void SyncOp() { throw new Exception("Exception in sync method"); } async static void AsyncVoidOp() { await AsyncTaskOp(); } async static Task AsyncTaskOp() { await Task.Delay(300); throw new Exception("Exception in async method"); } }
Am I missing something? How can I make the debugger to break/stop on the exception in AsyncTaskOp()
?
As we know, in asynchronous programming, control does not wait for the function's result and it executes the next line. So when the function throws an exception, at that moment the program control is out of the try-catch block.
Learn the exception handling semantics for asynchronous methods in C# Exception handling is the technique of handling runtime errors in an application. Asynchronous programming allows us to perform resource-intensive operations without the need for blocking on the main or executing thread of the application.
With a solution open in Visual Studio, use Debug > Windows > Exception Settings to open the Exception Settings window. Provide handlers that respond to the most important exceptions. If you need to know how to add handlers for exceptions, see Fix bugs by writing better C# code.
Under the Debug
menu, select Exceptions...
. In the Exceptions dialog, next to the Common Language Runtime Exceptions
line check the Thrown
box.
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