mcs/tests/test-pattern-01.cs

   1 using System;
   2
   3 class TypePattern
   4 {
   5         public static int Main ()
   6         {
   7                 object o = 3;
   8                 bool r = o is System.String t1;
   9                 if (r)
  10                         return 2;
  11
  12                 if (o is string t2)
  13                         return 3;
  14
  15                 long? l = 5;
  16                 bool r3 = l is long t4;
  17
  18                 if (!r3)
  19                         return 8;
  20
  21                 Console.WriteLine ("ok");
  22                 return 0;
  23         }
  24
  25         static void Test1 (object arg)
  26         {
  27                 while (arg is int b) {
  28                         b = 2;
  29                 }
  30         }
  31
  32         static string Test2 (object arg)
  33         {
  34                 if (arg is string s) {
  35                         return s;
  36                 } else {
  37                         s = "";
  38                 }
  39
  40                 return s;
  41         }
  42 }