mcs/tests/gtest-linq-01.cs

   1 using System;
   2 using System.Collections.Generic;
   3 using System.Linq;
   4
   5 namespace from
   6 {
   7         interface ITest
   8         {
   9                 int Id { get; }
  10         }
  11
  12         class C
  13         {
  14                 // This is pure grammar/parser test
  15                 public static void Main ()
  16                 {
  17                         int[] i2 = new int [] { 0, 1 };
  18                         int[] i_b = new int [] { 0, 1 };
  19                         ITest[] join_test = new ITest[0];
  20
  21                         IEnumerable<int> e;
  22                         IEnumerable<IGrouping<int,int>> g;
  23
  24                         // FROM
  25                         e = from i in i2 select i;
  26                         e = from int i in i2 select i;
  27                         var e2 = from bool? i in i2 select i;
  28                         e = from i in new int[0] select i;
  29                         e = from x in i2 from y in i2 select y;
  30
  31                         // WHERE
  32                         e = from i in i2 where i % 3 != 0 select i;
  33
  34                         // ORDER BY
  35                         e = from i in i2 orderby i select i;
  36                         e = from i in i2 orderby i, i, i, i select i;
  37                         e = from i in i2 orderby i descending select i;
  38                         e = from i in i2 orderby i ascending select i;
  39
  40                         // JOIN
  41                         e = from i in i2 join j in join_test on i equals j.Id select i;
  42                         e = from i in i2 join ITest j in join_test on i equals j.Id select i;
  43                         e = from i in i2 join j in join_test on i equals j.Id
  44                                 join j2 in join_test on i equals j2.Id select i;
  45                         e = from i in i2 join j in i_b on i equals j into j select i;
  46                         e = from i in i2 join int j in i_b on i equals j into j select i;
  47
  48                         // GROUP BY
  49                         g = from i in i2 group i by 2;
  50                         g = from i in i2 group i by 2 into i select i;
  51
  52                         // LET
  53                         e = from i in i2 let l = i + 4 select i;
  54                         e = from i in i2 let l = i + 4 let l2 = l + 2 select i;
  55
  56                         // INTO
  57                         g = from i in i2 group i by 2 into i9
  58                                 from i in i2 group i by 2 into i9
  59                                 from i in i2 group i by 2 into i9
  60                                 from i in i2 group i by 2 into i9
  61                                 select i9;
  62
  63                         // NESTED
  64                         var e3 = from a in
  65                                         from b in i2
  66                                         select b
  67                                 orderby a
  68                                 select a;
  69
  70                         var e4 = from i in
  71                                         from x in i2
  72                                         select x
  73                                 let l = from x2 in i2 select x2
  74                                 let l2 = 50
  75                                 select 1;
  76
  77                         int from = 0;
  78                         bool let = false;
  79
  80                         // TODO: Re-enable when we fix cast of query expression
  81                         //object o = (object)from i in i2 select i;
  82                 }
  83
  84                 void Foo (int from, bool where)
  85                 {
  86                         int Foo = 0;
  87                         if (from < Foo) // This tests generics micro-parser awareness
  88                                 return;
  89                 }
  90
  91                 int foo;
  92                 void Do (string[] args)
  93                 {
  94                         int from = this.foo;
  95                         Console.WriteLine (args [from]);
  96                 }
  97         }
  98
  99         class D
 100         {
 101                 public bool check (object from, object to)
 102                 {
 103                         if (from is int && to is int) return true;
 104                                 return false;
 105                 }
 106         }
 107 }
 108
 109 namespace FromProblems2
 110 {
 111         class from
 112         {
 113         }
 114
 115         class C
 116         {
 117                 void M1 ()
 118                 {
 119                         from local = new from ();
 120                 }
 121
 122                 from M2 ()
 123                 {
 124                         return null;
 125                 }
 126         }
 127 }
 128