mcs/tests/gtest-iter-11.cs

   1 using System;
   2 using System.Collections;
   3 using System.Collections.Generic;
   4
   5 class Foo {}
   6
   7 class Bar : Foo {
   8         public string Name { get; set; }
   9 }
  10
  11 class Collection<T> : IEnumerable<T> where T : Foo {
  12         List<T> list = new List<T> ();
  13
  14         public void Add (T t)
  15         {
  16                 list.Add (t);
  17         }
  18
  19         public IEnumerator<T> GetEnumerator ()
  20         {
  21                 foreach (T t in list)
  22                         yield return t;
  23         }
  24
  25         IEnumerator IEnumerable.GetEnumerator ()
  26         {
  27                 return GetEnumerator ();
  28         }
  29 }
  30
  31 class BarCollection : Collection<Bar> {}
  32
  33 class Program {
  34
  35         static int Main ()
  36         {
  37                 var collection = new BarCollection () {
  38                         new Bar { Name = "a" },
  39                         new Bar { Name = "b" },
  40                         new Bar { Name = "c" },
  41                 };
  42
  43                 foreach (var bar in collection)
  44                         Console.WriteLine (bar.Name);
  45
  46                 return 0;
  47         }
  48 }