mcs/tests/gtest-linq-01.cs

   1
   2
   3 using System;
   4 using System.Collections.Generic;
   5 using System.Linq;
   6
   7 namespace from
   8 {
   9         interface ITest
  10         {
  11                 int Id { get; }
  12         }
  13
  14         class C
  15         {
  16                 // This is pure grammar test
  17                 public static void Main ()
  18                 {
  19                         int[] i2 = new int [] { 0, 1 };
  20                         int[] i_b = new int [] { 0, 1 };
  21                         ITest[] join_test = new ITest[0];
  22
  23                         IEnumerable<int> e;
  24                         IEnumerable<IGrouping<int,int>> g;
  25
  26                         // FROM
  27                         e = from i in i2 select i;
  28                         e = from int i in i2 select i;
  29                         var e2 = from bool? i in i2 select i;
  30                         e = from i in new int[0] select i;
  31                         e = from x in i2 from y in i2 select y;
  32
  33                         // WHERE
  34                         e = from i in i2 where i % 3 != 0 select i;
  35
  36                         // ORDER BY
  37                         e = from i in i2 orderby i select i;
  38                         e = from i in i2 orderby i, i, i, i select i;
  39                         e = from i in i2 orderby i descending select i;
  40                         e = from i in i2 orderby i ascending select i;
  41
  42                         // JOIN
  43                         e = from i in i2 join j in join_test on i equals j.Id select i;
  44                         e = from i in i2 join ITest j in join_test on i equals j.Id select i;
  45                         e = from i in i2 join j in join_test on i equals j.Id
  46                                 join j2 in join_test on i equals j2.Id select i;
  47                         e = from i in i2 join j in i_b on i equals j into j select i;
  48                         e = from i in i2 join int j in i_b on i equals j into j select i;
  49
  50                         // GROUP BY
  51                         g = from i in i2 group i by 2;
  52                         g = from i in i2 group i by 2 into i select i;
  53
  54                         // LET
  55                         e = from i in i2 let l = i + 4 select i;
  56                         e = from i in i2 let l = i + 4 let l2 = l + 2 select i;
  57
  58                         // INTO
  59                         g = from i in i2 group i by 2 into i9
  60                                 from i in i2 group i by 2 into i9
  61                                 from i in i2 group i by 2 into i9
  62                                 from i in i2 group i by 2 into i9
  63                                 select i9;
  64
  65                         // NESTED
  66                         var e3 = from a in
  67                                         from b in i2
  68                                         select b
  69                                 orderby a
  70                                 select a;
  71
  72                         var e4 = from i in
  73                                         from x in i2
  74                                         select x
  75                                 let l = from x2 in i2 select x2
  76                                 let l2 = 50
  77                                 select 1;
  78
  79                         int from = 0;
  80                         bool let = false;
  81
  82                         // TODO: Re-enable when we fix cast of query expression
  83                         //object o = (object)from i in i2 select i;
  84                 }
  85
  86                 void Foo (int from, bool where)
  87                 {
  88                         int Foo = 0;
  89                         if (from < Foo) // This tests generics micro-parser awareness
  90                                 return;
  91                 }
  92
  93                 int foo;
  94                 void Do (string[] args)
  95                 {
  96                         int from = this.foo;
  97                         Console.WriteLine (args [from]);
  98                 }
  99         }
 100
 101         class D
 102         {
 103                 public bool check (object from, object to)
 104                 {
 105                         if (from is int && to is int) return true;
 106                                 return false;
 107                 }
 108         }
 109 }