mcs/tests/test-async-83.cs

   1 using System;
   2 using System.Threading.Tasks;
   3
   4 class MainClass
   5 {
   6         public static int Main ()
   7         {
   8                 var t = GetSomeStrings (null);
   9                 try {
  10                         var s = t.Result;
  11                         return 1;
  12                 } catch (AggregateException e) {
  13                         if (e.InnerException is NullReferenceException)
  14                                 return 0;
  15
  16                         return 2;
  17                 }
  18         }
  19
  20         public static async Task<string> GetSomeStrings (AsyncStringFactory myFactory)
  21         {
  22                 var res = await myFactory?.GetSomeStringAsync ();
  23                 return res;
  24         }
  25 }
  26
  27 public class AsyncStringFactory
  28 {
  29         public async Task<string> GetSomeStringAsync ()
  30         {
  31                 await Task.Yield();
  32                 return "foo";
  33         }
  34 }