mcs/tests/gtest-linq-04.cs

   1
   2
   3 using System;
   4 using System.Collections.Generic;
   5 using System.Linq;
   6
   7 class TestGroupBy
   8 {
   9         public static int Main ()
  10         {
  11                 int[] int_array = new int [] { 0, 1, 2, 3, 4 };
  12
  13                 IEnumerable<IGrouping<int, int>> e;
  14
  15                 // group by i % 2 from 1
  16                 e = from int i in int_array group 1 by i % 2;
  17
  18                 List<IGrouping<int, int>> output = e.ToList ();
  19                 if (output.Count != 2)
  20                         return 1;
  21
  22                 foreach (IGrouping<int, int> ig in e) {
  23                         Console.WriteLine (ig.Key);
  24                         foreach (int value in ig) {
  25                                 Console.WriteLine ("\t" + value);
  26                                 if (value != 1)
  27                                         return 2;
  28                         }
  29                 }
  30
  31                 // group by i % 2 from i
  32                 e = from int i in int_array group i by i % 2;
  33
  34                 output = e.ToList ();
  35                 if (output.Count != 2)
  36                         return 1;
  37
  38                 int[] results_a = new int[] { 0, 2, 4, 1, 3 };
  39                 int pos = 0;
  40
  41                 foreach (IGrouping<int, int> ig in e) {
  42                         Console.WriteLine (ig.Key);
  43                         foreach (int value in ig) {
  44                                 Console.WriteLine ("\t" + value);
  45                                 if (value != results_a [pos++])
  46                                         return 3;
  47                         }
  48                 }
  49
  50                 Console.WriteLine ("OK");
  51                 return 0;
  52         }
  53 }