Created
June 17, 2019 08:41
-
-
Save tocalai/24b9254cc212cd636d73f12b28754b07 to your computer and use it in GitHub Desktop.
Demonstrate use continue with to handle task exception
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
class Program | |
{ | |
static void Main (string[] args) | |
{ | |
AppDomain.CurrentDomain.UnhandledException += CurrentDomain_UnhandledException; | |
TaskScheduler.UnobservedTaskException += TaskScheduler_UnobservedTaskException; | |
var t1 = RunTaskWithException (); | |
// case for handle exception | |
t1.ContinueWith(_ => | |
{ | |
var message = string.Empty; | |
foreach(var ex in _.Exception.Flatten().InnerExceptions) | |
{ | |
message += ex.Message + Environment.NewLine; | |
} | |
Console.WriteLine($"Catch exception: {message}"); | |
}, | |
TaskContinuationOptions.OnlyOnFaulted | |
); | |
// case for continue process other task if t1 got expected execute | |
t1.ContinueWith(_ => | |
{ | |
// ... | |
Console.WriteLine($"Do other processing"); | |
}, | |
TaskContinuationOptions.OnlyOnRanToCompletion | |
); | |
#if (!DEBUG) | |
Thread.Sleep (1000); | |
GC.Collect (); | |
GC.WaitForPendingFinalizers (); | |
GC.Collect (); | |
Thread.Sleep (1000); | |
#endif | |
Console.WriteLine ("Press any key to exit..."); | |
Console.ReadKey (); | |
} | |
private static void TaskScheduler_UnobservedTaskException (object sender, UnobservedTaskExceptionEventArgs e) | |
{ | |
e.SetObserved (); | |
Console.WriteLine ($"Task unobservedTaskExeption occurs {e.Exception}."); | |
} | |
private static void CurrentDomain_UnhandledException (object sender, UnhandledExceptionEventArgs e) | |
{ | |
Console.WriteLine ($"Unhandled exception occurs {e.ExceptionObject}."); | |
} | |
private static Task<int> RunTaskWithException () { | |
return System.Threading.Tasks.Task.Factory.StartNew (() => { | |
var n1 = 1; | |
var n2 = 0; | |
var result = n1 / n2; | |
return result; | |
}); | |
} | |
private static Task<int> RunTaskWithExceptionInnerTryCatch () | |
{ | |
return System.Threading.Tasks.Task.Factory.StartNew (() => | |
{ | |
try | |
{ | |
var n1 = 1; | |
var n2 = 0; | |
var result = n1 / n2; | |
return result; | |
} | |
catch (Exception ex) | |
{ | |
Console.WriteLine ($"Exception occurs, {ex.Message}"); | |
return 0; | |
} | |
}); | |
} | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment