Continue With handle task excpetion(II)

Program.cs

class Program
 {
     static void Main (string[] args)
     {

         AppDomain.CurrentDomain.UnhandledException += CurrentDomain_UnhandledException;
         TaskScheduler.UnobservedTaskException += TaskScheduler_UnobservedTaskException;

         var t1 = RunTaskWithException ();
         
         t1.ContinueWith (_ => 
         {
             if (_.IsFaulted) 
             {
                 var message = string.Empty;
                 foreach (var ex in _.Exception.Flatten ().InnerExceptions) 
                 {
                     message += ex.Message + Environment.NewLine;
                 }

                 Console.WriteLine ($"Catch exception: {message}");
                 return;
             }

             if (_.IsCompletedSuccessfully) 
             {
                 // ...
                 Console.WriteLine ($"Do other processing");
             }
         });

#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;
             }
         });
     }
 }