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

   1 //
   2 // ExpressionTest_Call.cs
   3 //
   4 // Author:
   5 //   Federico Di Gregorio <fog@initd.org>
   6 //   Jb Evain (jbevain@novell.com)
   7 //
   8 // (C) 2008 Novell, Inc. (http://www.novell.com)
   9 //
  10 // Permission is hereby granted, free of charge, to any person obtaining
  11 // a copy of this software and associated documentation files (the
  12 // "Software"), to deal in the Software without restriction, including
  13 // without limitation the rights to use, copy, modify, merge, publish,
  14 // distribute, sublicense, and/or sell copies of the Software, and to
  15 // permit persons to whom the Software is furnished to do so, subject to
  16 // the following conditions:
  17 //
  18 // The above copyright notice and this permission notice shall be
  19 // included in all copies or substantial portions of the Software.
  20 //
  21 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  22 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  23 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  24 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  25 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  26 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  27 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  28 //
  29
  30 using System;
  31 using System.Reflection;
  32 using System.Collections.Generic;
  33 using System.Linq;
  34 using System.Linq.Expressions;
  35 using NUnit.Framework;
  36
  37 namespace MonoTests.System.Linq.Expressions {
  38
  39         [TestFixture]
  40         public class ExpressionTest_Call {
  41
  42                 [Test]
  43                 [ExpectedException (typeof (ArgumentNullException))]
  44                 public void Arg1Null ()
  45                 {
  46                         Expression.Call ((Type)null, "TestMethod", null, Expression.Constant (1));
  47                 }
  48
  49                 [Test]
  50                 [ExpectedException (typeof (ArgumentNullException))]
  51                 public void Arg2Null ()
  52                 {
  53                         Expression.Call (typeof (MemberClass), null, null, Expression.Constant (1));
  54                 }
  55
  56                 [Test]
  57                 [ExpectedException (typeof (InvalidOperationException))]
  58                 public void Arg4WrongType ()
  59                 {
  60                         Expression.Call (typeof (MemberClass), "StaticMethod", null, Expression.Constant (true));
  61                 }
  62
  63                 [Test]
  64                 [ExpectedException (typeof (InvalidOperationException))]
  65                 public void InstanceMethod ()
  66                 {
  67                         Expression.Call (typeof (MemberClass), "TestMethod", null, Expression.Constant (1));
  68                 }
  69
  70                 [Test]
  71                 public void StaticMethod ()
  72                 {
  73                         Expression.Call (typeof (MemberClass), "StaticMethod", null, Expression.Constant (1));
  74                 }
  75
  76                 [Test]
  77                 public void StaticGenericMethod ()
  78                 {
  79                         Expression.Call (typeof (MemberClass), "StaticGenericMethod", new [] { typeof (int) }, Expression.Constant (1));
  80                 }
  81
  82                 [Test]
  83                 [ExpectedException (typeof (ArgumentNullException))]
  84                 public void ArgMethodNull ()
  85                 {
  86                         Expression.Call (Expression.Constant (new object ()), null);
  87                 }
  88
  89                 [Test]
  90 #if NET_4_0 && !MONOTOUCH
  91                 [ExpectedException (typeof (ArgumentException))]
  92 #else
  93                 [ExpectedException (typeof (ArgumentNullException))]
  94 #endif
  95                 public void ArgInstanceNullForNonStaticMethod ()
  96                 {
  97                         Expression.Call (null, typeof (object).GetMethod ("ToString"));
  98                 }
  99
 100                 [Test]
 101 #if MOBILE
 102                 [Category ("NotWorking")] // String:Intern () is linked away
 103 #endif
 104                 [ExpectedException (typeof (ArgumentException))]
 105                 public void InstanceTypeDoesntMatchMethodDeclaringType ()
 106                 {
 107                         Expression.Call (Expression.Constant (1), typeof (string).GetMethod ("Intern"));
 108                 }
 109
 110                 [Test]
 111                 [ExpectedException (typeof (ArgumentException))]
 112                 public void MethodArgumentCountDoesnMatchParameterLength ()
 113                 {
 114                         Expression.Call (Expression.Constant (new object ()), typeof (object).GetMethod ("ToString"), Expression.Constant (new object ()));
 115                 }
 116
 117                 public class Foo {
 118                         public void Bar (string s)
 119                         {
 120                         }
 121                 }
 122
 123                 [Test]
 124                 [ExpectedException (typeof (ArgumentNullException))]
 125                 public void MethodHasNullArgument ()
 126                 {
 127                         Expression.Call (Expression.New (typeof (Foo)), typeof (Foo).GetMethod ("Bar"), null as Expression);
 128                 }
 129
 130                 [Test]
 131                 [ExpectedException (typeof (ArgumentException))]
 132                 public void MethodArgumentDoesntMatchParameterType ()
 133                 {
 134                         Expression.Call (Expression.New (typeof (Foo)), typeof (Foo).GetMethod ("Bar"), Expression.Constant (42));
 135                 }
 136
 137                 [Test]
 138                 public void CallToString ()
 139                 {
 140                         var call = Expression.Call (Expression.Constant (new object ()), typeof (object).GetMethod ("ToString"));
 141                         Assert.AreEqual ("value(System.Object).ToString()", call.ToString ());
 142                 }
 143
 144                 [Test]
 145                 public void CallStringIsNullOrEmpty ()
 146                 {
 147                         var call = Expression.Call (null, typeof (string).GetMethod ("IsNullOrEmpty"), Expression.Constant (""));
 148                         Assert.AreEqual ("IsNullOrEmpty(\"\")", call.ToString ());
 149                 }
 150
 151                 [Test]
 152                 [Category ("NotDotNet")] // http://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=339351
 153                 [ExpectedException (typeof (ArgumentException))]
 154                 public void CallStaticMethodWithInstanceArgument ()
 155                 {
 156                         Expression.Call (
 157                                 Expression.Parameter (GetType (), "t"),
 158                                 GetType ().GetMethod ("Identity"),
 159                                 Expression.Constant (null));
 160                 }
 161
 162                 public static object Identity (object o)
 163                 {
 164                         return o;
 165                 }
 166
 167                 [Test]
 168                 public void CompileSimpleStaticCall ()
 169                 {
 170                         var p = Expression.Parameter (typeof (object), "o");
 171                         var lambda = Expression.Lambda<Func<object, object>> (Expression.Call (GetType ().GetMethod ("Identity"), p), p);
 172
 173                         var i = lambda.Compile ();
 174
 175                         Assert.AreEqual (2, i (2));
 176                         Assert.AreEqual ("Foo", i ("Foo"));
 177                 }
 178
 179                 [Test]
 180                 public void CompileSimpleInstanceCall ()
 181                 {
 182                         var p = Expression.Parameter (typeof (string), "p");
 183                         var lambda = Expression.Lambda<Func<string, string>> (
 184                                 Expression.Call (
 185                                         p, typeof (string).GetMethod ("ToString", Type.EmptyTypes)),
 186                                 p);
 187
 188                         var ts = lambda.Compile ();
 189
 190                         Assert.AreEqual ("foo", ts ("foo"));
 191                         Assert.AreEqual ("bar", ts ("bar"));
 192                 }
 193
 194                 [Test]
 195                 [ExpectedException (typeof (InvalidOperationException))]
 196                 public void CheckTypeArgsIsNotUsedForParameterLookup ()
 197                 {
 198                         Expression.Call (GetType (), "EineMethod", new [] { typeof (string), typeof (int) }, "foo".ToConstant (), 2.ToConstant ());
 199                 }
 200
 201                 public static void EineGenericMethod<X, Y> (string foo, int bar)
 202                 {
 203                 }
 204
 205                 [Test]
 206                 public void CheckTypeArgsIsUsedForGenericArguments ()
 207                 {
 208                         var m = Expression.Call (GetType (), "EineGenericMethod", new [] { typeof (string), typeof (int) }, "foo".ToConstant (), 2.ToConstant ());
 209                         Assert.IsNotNull (m.Method);
 210                         Assert.AreEqual ("Void EineGenericMethod[String,Int32](System.String, Int32)", m.Method.ToString ());
 211                 }
 212
 213                 public struct EineStrukt {
 214
 215                         public string Foo;
 216
 217                         public EineStrukt (string foo)
 218                         {
 219                                 Foo = foo;
 220                         }
 221
 222                         public string GimmeFoo ()
 223                         {
 224                                 return Foo;
 225                         }
 226                 }
 227
 228                 [Test]
 229                 public void CallMethodOnStruct ()
 230                 {
 231                         var param = Expression.Parameter (typeof (EineStrukt), "s");
 232                         var foo = Expression.Lambda<Func<EineStrukt, string>> (
 233                                 Expression.Call (param, typeof (EineStrukt).GetMethod ("GimmeFoo")), param).Compile ();
 234
 235                         var s = new EineStrukt ("foo");
 236                         Assert.AreEqual ("foo", foo (s));
 237                 }
 238
 239                 public static int OneStaticMethod ()
 240                 {
 241                         return 42;
 242                 }
 243
 244                 [Test]
 245                 [Category ("NotDotNet")] // http://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=339351
 246                 [ExpectedException (typeof (ArgumentException))]
 247                 public void CallStaticMethodOnNonSenseInstanceExpression ()
 248                 {
 249                         Expression.Call (
 250                                 Expression.Constant ("la la la"),
 251                                 this.GetType ().GetMethod ("OneStaticMethod"));
 252                 }
 253
 254                 public static int DoSomethingWith (ref int a)
 255                 {
 256                         return a + 4;
 257                 }
 258
 259                 public static string DoAnotherThing (ref int a, string s)
 260                 {
 261                         return s + a;
 262                 }
 263
 264                 [Test]
 265                 public void CallStaticMethodWithRefParameter ()
 266                 {
 267                         var p = Expression.Parameter (typeof (int), "i");
 268
 269                         var c = Expression.Lambda<Func<int, int>> (
 270                                 Expression.Call (GetType ().GetMethod ("DoSomethingWith"), p), p).Compile ();
 271
 272                         Assert.AreEqual (42, c (38));
 273                 }
 274
 275                 [Test]
 276                 public void CallStaticMethodWithRefParameterAndOtherParameter ()
 277                 {
 278                         var i = Expression.Parameter (typeof (int), "i");
 279                         var s = Expression.Parameter (typeof (string), "s");
 280
 281                         var lamda = Expression.Lambda<Func<int, string, string>> (
 282                                 Expression.Call (GetType ().GetMethod ("DoAnotherThing"), i, s), i, s).Compile ();
 283
 284                         Assert.AreEqual ("foo42", lamda (42, "foo"));
 285                 }
 286
 287                 public static int Bang (Expression i)
 288                 {
 289                         return (int) (i as ConstantExpression).Value;
 290                 }
 291 #if !NET_4_0 // dlr bug 5875
 292                 [Test]
 293                 public void CallMethodWithExpressionParameter ()
 294                 {
 295                         var call = Expression.Call (GetType ().GetMethod ("Bang"), Expression.Constant (42));
 296                         Assert.AreEqual (ExpressionType.Quote, call.Arguments [0].NodeType);
 297
 298                         var l = Expression.Lambda<Func<int>> (call).Compile ();
 299
 300                         Assert.AreEqual (42, l ());
 301                 }
 302 #endif
 303                 static bool fout_called = false;
 304
 305                 public static int FooOut (out int x)
 306                 {
 307                         fout_called = true;
 308                         return x = 0;
 309                 }
 310
 311                 [Test]
 312                 public void Connect282729 ()
 313                 {
 314                         // test from https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=282729
 315
 316                         var p = Expression.Parameter (typeof (int), "p");
 317                         var lambda = Expression.Lambda<Func<int, int>> (
 318                                 Expression.Call (
 319                                         GetType ().GetMethod ("FooOut"),
 320                                         Expression.ArrayIndex(
 321                                                 Expression.NewArrayBounds (
 322                                                         typeof(int),
 323                                                         1.ToConstant ()),
 324                                                 0.ToConstant ())),
 325                                 p).Compile ();
 326
 327                         Assert.AreEqual (0, lambda (0));
 328                         Assert.IsTrue (fout_called);
 329                 }
 330
 331                 public static int FooOut2 (out int x)
 332                 {
 333                         x = 2;
 334                         return 3;
 335                 }
 336
 337                 [Test]
 338                 [Category ("NotWorking")]
 339                 public void Connect290278 ()
 340                 {
 341                         // test from https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=290278
 342
 343                         var p = Expression.Parameter (typeof (int [,]), "p");
 344                         var lambda = Expression.Lambda<Func<int [,], int>> (
 345                                 Expression.Call (
 346                                         GetType ().GetMethod ("FooOut2"),
 347                                         Expression.ArrayIndex (p, 0.ToConstant (), 0.ToConstant ())),
 348                                 p).Compile ();
 349
 350                         int [,] data = { { 1 } };
 351
 352                         Assert.AreEqual (3, lambda (data));
 353                         Assert.AreEqual (2, data [0, 0]);
 354                 }
 355
 356                 public static void FooRef (ref string s)
 357                 {
 358                 }
 359
 360                 [Test]
 361                 public void Connect297597 ()
 362                 {
 363                         // test from https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=297597
 364
 365                         var strings = new string [1];
 366
 367                         var lambda = Expression.Lambda<Action> (
 368                                 Expression.Call (
 369                                         GetType ().GetMethod ("FooRef"),
 370                                         Expression.ArrayIndex (
 371                                                 Expression.Constant (strings), 0.ToConstant ()))).Compile ();
 372
 373                         lambda ();
 374                 }
 375
 376                 [Test]
 377 #if MONOTOUCH
 378                 [Category ("NotWorking")]
 379 #endif
 380                 [Category ("NotDotNet")] // https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=319190
 381                 public void Connect319190 ()
 382                 {
 383                         var lambda = Expression.Lambda<Func<bool>> (
 384                                 Expression.TypeIs (
 385                                         Expression.New (typeof (TypedReference)),
 386                                         typeof (object))).Compile ();
 387
 388                         Assert.IsTrue (lambda ());
 389                 }
 390
 391                 public static int Truc ()
 392                 {
 393                         return 42;
 394                 }
 395
 396                 [Test]
 397                 public void Connect282702 ()
 398                 {
 399                         var lambda = Expression.Lambda<Func<Func<int>>> (
 400                                 Expression.Convert (
 401                                         Expression.Call (
 402                                                 typeof (Delegate).GetMethod ("CreateDelegate", new [] { typeof (Type), typeof (object), typeof (MethodInfo) }),
 403                                                 Expression.Constant (typeof (Func<int>), typeof (Type)),
 404                                                 Expression.Constant (null, typeof (object)),
 405                                                 Expression.Constant (GetType ().GetMethod ("Truc"))),
 406                                         typeof (Func<int>))).Compile ();
 407
 408                         Assert.AreEqual (42, lambda ().Invoke ());
 409                 }
 410
 411                 [Test]
 412                 public void CallQueryableWhere ()
 413                 {
 414                         var queryable = new [] { 1, 2, 3 }.AsQueryable ();
 415
 416                         var parameter = Expression.Parameter (typeof (int), "i");
 417                         var lambda = Expression.Lambda<Func<int, bool>> (
 418                                 Expression.LessThan (parameter, Expression.Constant (2)),
 419                                 parameter);
 420
 421                         var selector = Expression.Quote (lambda);
 422
 423                         var call = Expression.Call (
 424                                 typeof (Queryable),
 425                                 "Where",
 426                                 new [] { typeof (int) },
 427                                 queryable.Expression,
 428                                 selector);
 429
 430                         Assert.IsNotNull (call);
 431                         Assert.IsNotNull (call.Method);
 432                 }
 433
 434                 [Test]
 435                 public void CallAsQueryable () // #537768
 436                 {
 437                         var constant = Expression.Constant (
 438                                 new List<string> (),
 439                                 typeof (IEnumerable<string>));
 440
 441                         var call = Expression.Call (
 442                                 typeof (Queryable),
 443                                 "AsQueryable",
 444                                 new [] { typeof (string) },
 445                                 constant);
 446
 447                         Assert.IsNotNull (call);
 448                         Assert.AreEqual (1, call.Arguments.Count);
 449                         Assert.AreEqual (constant, call.Arguments [0]);
 450
 451                         var method = call.Method;
 452
 453                         Assert.AreEqual ("AsQueryable", method.Name);
 454                         Assert.IsTrue (method.IsGenericMethod);
 455                         Assert.AreEqual (typeof (string), method.GetGenericArguments () [0]);
 456                 }
 457
 458
 459                 [Test]
 460                 public void CallQueryableSelect () // #536637
 461                 {
 462                         var parameter = Expression.Parameter (typeof (string), "s");
 463                         var string_length = Expression.Property (parameter, typeof (string).GetProperty ("Length"));
 464                         var lambda = Expression.Lambda (string_length, parameter);
 465
 466                         var strings = new [] { "1", "22", "333" };
 467
 468                         var call = Expression.Call (
 469                                 typeof (Queryable),
 470                                 "Select",
 471                                 new [] { typeof (string), typeof (int) },
 472                                 Expression.Constant (strings.AsQueryable ()),
 473                                 lambda);
 474
 475                         Assert.IsNotNull (call);
 476
 477                         var method = call.Method;
 478
 479                         Assert.AreEqual ("Select", method.Name);
 480                         Assert.IsTrue (method.IsGenericMethod);
 481                         Assert.AreEqual (typeof (string), method.GetGenericArguments () [0]);
 482                         Assert.AreEqual (typeof (int), method.GetGenericArguments () [1]);
 483                 }
 484
 485                 [Test]
 486 #if MONOTOUCH
 487                 [Category ("NotWorking")]
 488 #endif
 489                 public void CallNullableGetValueOrDefault () // #568989
 490                 {
 491                         var value = Expression.Parameter (typeof (int?), "value");
 492                         var default_parameter = Expression.Parameter (typeof (int), "default");
 493
 494                         var getter = Expression.Lambda<Func<int?, int, int>> (
 495                                 Expression.Call (
 496                                         value,
 497                                         "GetValueOrDefault",
 498                                         Type.EmptyTypes,
 499                                         default_parameter),
 500                                 value,
 501                                 default_parameter).Compile ();
 502
 503                         Assert.AreEqual (2, getter (null, 2));
 504                         Assert.AreEqual (4, getter (4, 2));
 505                 }
 506
 507                 [Test]
 508                 public void CallToStringOnEnum () // #625367
 509                 {
 510                         var lambda = Expression.Lambda<Func<string>> (
 511                                 Expression.Call (
 512                                         Expression.Constant (TypeCode.Boolean, typeof (TypeCode)),
 513                                         typeof (object).GetMethod ("ToString"))).Compile ();
 514
 515                         Assert.AreEqual ("Boolean", lambda ());
 516                 }
 517
 518                 public static void AcceptsIEnumerable(IEnumerable<object> o)
 519                 {
 520                 }
 521
 522                 [Test]
 523                 public void CallIQueryableMethodWithNewArrayBoundExpression () // #2304
 524                 {
 525                         Expression.Call (
 526                                 GetType ().GetMethod ("AcceptsIEnumerable", BindingFlags.Public | BindingFlags.Static),
 527                                 Expression.NewArrayBounds (typeof (object), Expression.Constant (0)));
 528                 }
 529         }
 530 }