Distinct (#21)

Author: StefH

src/System.Linq.Dynamic.Core/DynamicQueryable.cs

@@ -16,6 +16,30 @@ namespace System.Linq.Dynamic.Core
     /// </summary>
     public static class DynamicQueryable
     {
+        /// <summary>
+        /// Determines whether a sequence contains any elements.
+        /// </summary>
+        /// <param name="source">A sequence to check for being empty.</param>
+        /// <param name="predicate">A function to test each element for a condition.</param>
+        /// <param name="args">An object array that contains zero or more objects to insert into the predicate as parameters. Similar to the way String.Format formats strings.</param>
+        /// <returns>true if the source sequence contains any elements; otherwise, false.</returns>
+        public static bool Any([NotNull] this IQueryable source, [NotNull] string predicate, params object[] args)
+        {
+            Check.NotNull(source, nameof(source));
+            Check.NotEmpty(predicate, nameof(predicate));
+
+            bool createParameterCtor = source.IsLinqToObjects();
+            LambdaExpression lambda = DynamicExpression.ParseLambda(createParameterCtor, source.ElementType, null, predicate, args);
+
+            return (bool)source.Provider.Execute(
+                Expression.Call(
+                    typeof(Queryable), "Any",
+                    new[] { source.ElementType },
+                    source.Expression,
+                    Expression.Quote(lambda))
+            );
+        }
+
         #region Where
 
         /// <summary>

src/System.Linq.Dynamic.Core/ExpressionParser.cs

@@ -188,6 +188,7 @@ interface IEnumerableSignatures
             void Contains(object selector);
             void Skip(int count);
             void Take(int count);
+            void Distinct();
 
             //Executors
             void Single();

test/System.Linq.Dynamic.Core.Tests/BasicTests.cs

@@ -6,26 +6,6 @@ namespace System.Linq.Dynamic.Core.Tests
 {
     public class BasicTests
     {
-
-        [Fact]
-        public void Any()
-        {
-            //Arrange
-            IQueryable testListFull = User.GenerateSampleModels(100).AsQueryable();
-            IQueryable testListOne = User.GenerateSampleModels(1).AsQueryable();
-            IQueryable testListNone = User.GenerateSampleModels(0).AsQueryable();
-
-            //Act
-            var resultFull = testListFull.Any();
-            var resultOne = testListOne.Any();
-            var resultNone = testListNone.Any();
-
-            //Assert
-            Assert.True(resultFull);
-            Assert.True(resultOne);
-            Assert.False(resultNone);
-        }
-
         [Fact]
         public void Count()
         {

test/System.Linq.Dynamic.Core.Tests/DynamicTests.cs

@@ -124,39 +124,7 @@ public void Contains()
             Assert.Equal(realQuery.ToArray(), testQuery.Cast<Guid>().ToArray());
         }
 
-        [Fact]
-        public void Any()
-        {
-            const string search = "e";
-
-            // Arrange
-            var testList = User.GenerateSampleModels(10);
-            var queryable = testList.AsQueryable();
-
-            // Act
-            var expected = queryable.Where(u => u.Roles.Any(r => r.Name.Contains(search))).ToArray();
-            var result = queryable.Where("Roles.Any(Name.Contains(@0))", search).ToArray();
-
-            Assert.Equal(expected, result);
-        }
-
-        // https://dynamiclinq.codeplex.com/discussions/654313
-        [Fact]
-        public void Any_Nested()
-        {
-            const string search = "a";
-
-            // Arrange
-            var testList = User.GenerateSampleModels(10);
-            var queryable = testList.AsQueryable();
-
-            // Act
-            var expected =
-                queryable.Where(u => u.Roles.Any(r => r.Permissions.Any(p => p.Name.Contains(search)))).ToArray();
-            var result = queryable.Where("Roles.Any(Permissions.Any(Name.Contains(@0)))", search).ToArray();
-
-            Assert.Equal(expected, result);
-        }
+        
 
         [Fact]
         // https://github.com/StefH/System.Linq.Dynamic.Core/issues/19