mcs/class/System.Core/Test/System.Linq.Expressions/ExpressionTest_Field.cs

   1 // Permission is hereby granted, free of charge, to any person obtaining
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   6 // permit persons to whom the Software is furnished to do so, subject to
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   9 // The above copyright notice and this permission notice shall be
  10 // included in all copies or substantial portions of the Software.
  11 //
  12 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  13 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  14 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  15 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  16 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  17 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  18 //
  19 // Authors:
  20 //              Federico Di Gregorio <fog@initd.org>
  21
  22 using System;
  23 using System.Reflection;
  24 using System.Linq;
  25 using System.Linq.Expressions;
  26 using NUnit.Framework;
  27
  28 namespace MonoTests.System.Linq.Expressions
  29 {
  30         [TestFixture]
  31         public class ExpressionTest_Field
  32         {
  33                 [Test]
  34                 [ExpectedException (typeof (ArgumentNullException))]
  35                 public void Arg1Null ()
  36                 {
  37                         Expression.Field (null, "NoField");
  38                 }
  39
  40                 [Test]
  41                 [ExpectedException (typeof (ArgumentNullException))]
  42                 public void Arg2Null1 ()
  43                 {
  44                         Expression.Field (Expression.Constant (new MemberClass()), (string)null);
  45                 }
  46
  47                 [Test]
  48                 [ExpectedException (typeof (ArgumentNullException))]
  49                 public void Arg2Null2 ()
  50                 {
  51                         Expression.Field (Expression.Constant (new MemberClass()), (FieldInfo)null);
  52                 }
  53
  54                 [Test]
  55                 [ExpectedException (typeof (ArgumentException))]
  56                 public void NoField ()
  57                 {
  58                         Expression.Field (Expression.Constant (new MemberClass()), "NoField");
  59                 }
  60
  61                 [Test]
  62                 public void InstanceField ()
  63                 {
  64                         MemberExpression expr = Expression.Field (Expression.Constant (new MemberClass()), "TestField1");
  65                         Assert.AreEqual (ExpressionType.MemberAccess, expr.NodeType, "Field#01");
  66                         Assert.AreEqual (typeof (int), expr.Type, "Field#02");
  67                         Assert.AreEqual ("value(MonoTests.System.Linq.Expressions.MemberClass).TestField1", expr.ToString(), "Field#03");
  68                 }
  69
  70                 [Test]
  71                 [ExpectedException (typeof (ArgumentException))]
  72                 public void StaticField1 ()
  73                 {
  74                         // This will fail because access to a static field should be created using a FieldInfo and
  75                         // not an instance plus the field name.
  76                         Expression.Field (Expression.Constant (new MemberClass()), "StaticField");
  77                 }
  78
  79                 [Test]
  80                 public void StaticField2 ()
  81                 {
  82                         MemberExpression expr = Expression.Field (null, MemberClass.GetStaticFieldInfo());
  83                         Assert.AreEqual (ExpressionType.MemberAccess, expr.NodeType, "Field#07");
  84                         Assert.AreEqual (typeof (int), expr.Type, "Field#08");
  85                         Assert.AreEqual ("MemberClass.StaticField", expr.ToString(), "Field#09");
  86                 }
  87
  88                 [Test]
  89                 [Category ("NotDotNet")] // http://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=339351
  90                 [ExpectedException (typeof (ArgumentException))]
  91                 public void StaticFieldWithInstanceArgument ()
  92                 {
  93                         Expression.Field (
  94                                 Expression.Parameter (GetType (), "t"),
  95                                 GetType ().GetField ("foo"));
  96                 }
  97
  98                 public static string foo = "foo";
  99
 100                 [Test]
 101                 public void CompileStaticField ()
 102                 {
 103                         var foo = Expression.Lambda<Func<string>> (
 104                                 Expression.Field (null, GetType ().GetField (
 105                                         "foo", BindingFlags.Static | BindingFlags.Public))).Compile ();
 106
 107                         Assert.AreEqual ("foo", foo ());
 108                 }
 109
 110                 public class Bar {
 111                         public string baz;
 112
 113                         public Bar ()
 114                         {
 115                                 baz = "baz";
 116                         }
 117                 }
 118
 119                 [Test]
 120                 public void CompileInstanceField ()
 121                 {
 122                         var p = Expression.Parameter (typeof (Bar), "bar");
 123                         var baz = Expression.Lambda<Func<Bar, string>> (
 124                                 Expression.Field (p, typeof (Bar).GetField (
 125                                         "baz", BindingFlags.Public | BindingFlags.Instance)), p).Compile ();
 126
 127                         Assert.AreEqual ("baz", baz (new Bar ()));
 128                 }
 129
 130                 public struct Gazonk {
 131                         public string Tzap;
 132
 133                         public Gazonk (string tzap)
 134                         {
 135                                 Tzap = tzap;
 136                         }
 137                 }
 138
 139                 [Test]
 140                 public void CompileStructInstanceField ()
 141                 {
 142                         var p = Expression.Parameter (typeof (Gazonk), "gazonk");
 143                         var gazonker = Expression.Lambda<Func<Gazonk, string>> (
 144                                 Expression.Field (p, typeof (Gazonk).GetField ("Tzap")), p).Compile ();
 145
 146                         Assert.AreEqual ("bang", gazonker (new Gazonk ("bang")));
 147                 }
 148         }
 149 }