Merge pull request #3 from dnyaneshwar-surywanshi/patch-1

I want To make the "Contains" method become case-insensitive so I hav…

DynamicExpressions.UnitTests/PredicateTests.cs

@@ -43,6 +43,7 @@ public void GetPredicate_ShouldHandleEqualsGenericOperators<T>(int id, T title,
         [InlineData(3, "Title 3", FilterOperator.NotContains, "5")]
         [InlineData(4, "Title 4", FilterOperator.StartsWith, "Title")]
         [InlineData(5, "Title 5", FilterOperator.EndsWith, "5")]
+        [InlineData(5, "Title 6", FilterOperator.ContainsIgnoreCase, "title")]
         public void GetPredicate_ShouldHandleNestedStringOperators(int id, string title, FilterOperator op, object value)
         {
             var entry = new Entry<string>(id, new SubEntry<string>(title));

DynamicExpressions/DynamicExpressions.cs

@@ -16,8 +16,9 @@ public static class DynamicExpressions
 
         private static readonly MethodInfo _stringContainsMethod = typeof(string).GetMethod("Contains"
             , new Type[] { typeof(string) });
+        private static readonly MethodInfo _stringContainsMethodIgnoreCase = typeof(string).GetMethod("Contains"
+            , new Type[] { typeof(string), typeof(StringComparison) });
         private static readonly MethodInfo _enumerableContainsMethod = typeof(Enumerable).GetMethods().Where(x => string.Equals(x.Name, "Contains", StringComparison.OrdinalIgnoreCase)).Single(x => x.GetParameters().Length == 2).MakeGenericMethod(typeof(string));
-
         private static readonly MethodInfo _dictionaryContainsKeyMethod = typeof(Dictionary<string, string>).GetMethods().Where(x => string.Equals(x.Name, "ContainsKey", StringComparison.OrdinalIgnoreCase)).Single();
         private static readonly MethodInfo _dictionaryContainsValueMethod = typeof(Dictionary<string, string>).GetMethods().Where(x => string.Equals(x.Name, "ContainsValue", StringComparison.OrdinalIgnoreCase)).Single();
 
@@ -61,6 +62,7 @@ private static Expression CreateFilter(MemberExpression prop, FilterOperator op,
                 FilterOperator.Equals => RobustEquals(prop, constant),
                 FilterOperator.GreaterThan => Expression.GreaterThan(prop, constant),
                 FilterOperator.LessThan => Expression.LessThan(prop, constant),
+                FilterOperator.ContainsIgnoreCase => Expression.Call(prop, _stringContainsMethodIgnoreCase, PrepareConstant(constant), Expression.Constant(StringComparison.OrdinalIgnoreCase)),
                 FilterOperator.Contains => GetContainsMethodCallExpression(prop, constant),
                 FilterOperator.NotContains => Expression.Not(GetContainsMethodCallExpression(prop, constant)),
                 FilterOperator.ContainsKey => Expression.Call(prop, _dictionaryContainsKeyMethod, PrepareConstant(constant)),

DynamicExpressions/FilterOperator.cs

@@ -12,6 +12,7 @@ public enum FilterOperator
         NotContains,
         StartsWith,
         EndsWith,
+        ContainsIgnoreCase,
         IsEmpty,
         IsNotEmpty,
         ContainsKey,