c# - Using TaskScheduler.UnobservedTaskException can avoid the process being killed? -

as know, if there's unhandled exception in task, , if don't handle taskscheduler.unobservedtaskexception, error later when gets collected/finalized, , kill process.(i should emphasize in .net4.0. know can suppress unhandled exception in .net4.5 default.)

this means if use taskscheduler.unobservedtaskexception, application can survived? tested below code:

static void main(string[] args) {     taskscheduler.unobservedtaskexception += (o, ev) =>     {         console.writeline(ev.exception);          console.writeline("---------");     };       (int = 0; < 10; i++)     {         try         {             var t = task.factory.startnew<int>(() => { throw new exception("xxxxxx"); return 1; }                 , cancellationtoken.none, taskcreationoptions.none, taskscheduler.default);         }         catch         {             console.writeline("error");         }     }      while (true)     {         gc.collect();         thread.sleep(1000);     }     console.readkey(); } 

create 10 tasks , each task throw unhandled exception. , unobservedtaskexception triggered once. application broken. (i tried create 1 task, application isn't broken.)

so conclusion using unobservedtaskexception event no useful, process still can killed. right??

you need call unobservedtaskexceptioneventargs.setobserved make observed exception:

taskscheduler.unobservedtaskexception += (o, ev) => {     console.writeline(ev.exception);      console.writeline("---------");     ev.setobserved(); };