mcs/tests/gtest-linq-09.cs

   1
   2
   3 using System;
   4 using System.Collections.Generic;
   5 using System.Linq;
   6
   7 class Data
   8 {
   9         public int Key;
  10         public string Value;
  11 }
  12
  13 class Join
  14 {
  15         public static int Main ()
  16         {
  17                 Data[] d1 = new Data[] { new Data () { Key = 1, Value = "First" } };
  18                 Data[] d2 = new Data[] {
  19                         new Data () { Key = 1, Value = "Second" },
  20                         new Data () { Key = 1, Value = "Third" }
  21                 };
  22
  23
  24                 var e = from a in d1
  25                         join b in d2 on a.Key equals b.Key
  26                         select new { Result = a.Value + b.Value };
  27
  28                 var res = e.ToList ();
  29                 if (res.Count != 2)
  30                         return 1;
  31
  32                 if (res [0].Result != "FirstSecond")
  33                         return 2;
  34
  35                 if (res [1].Result != "FirstThird")
  36                         return 3;
  37
  38                 e = from Data a in d1
  39                         join b in d2 on a.Key equals b.Key
  40                         where b.Value == "Second"
  41                         select new { Result = a.Value + b.Value };
  42
  43                 res = e.ToList ();
  44                 if (res.Count != 1)
  45                         return 4;
  46
  47                 if (res [0].Result != "FirstSecond")
  48                         return 5;
  49
  50                 // Explicitly typed
  51                 e = from Data a in d1
  52             join Data b in d2 on a.Key equals b.Key
  53             select new { Result = a.Value + b.Value };
  54
  55                 res = e.ToList ();
  56                 if (res.Count != 2)
  57                         return 10;
  58
  59                 if (res [0].Result != "FirstSecond")
  60                         return 11;
  61
  62                 if (res [1].Result != "FirstThird")
  63                         return 12;
  64
  65                 var e2 = from Data a in d1
  66                         join b in d2 on a.Key equals b.Key
  67                         group b by a.Key;
  68
  69                 var res2 = e2.ToList ();
  70                 if (res2.Count != 1)
  71                         return 20;
  72
  73                 if (res2 [0].Key != 1)
  74                         return 21;
  75
  76                 Console.WriteLine ("OK");
  77                 return 0;
  78         }
  79 }
  80