-Fixed deserializing to IEnumerable<T> properties

Src/Newtonsoft.Json.Tests/Serialization/JsonSerializerTest.cs

@@ -4684,5 +4684,21 @@ keyword such as type of business.""
       PrivateMembersClassWithAttributes c2 = JsonConvert.DeserializeObject<PrivateMembersClassWithAttributes>(json);
       Assert.AreEqual("readonlyString!", c2.UseValue());
     }
+
+    public partial class BusRun
+    {
+      public IEnumerable<Nullable<DateTime>> Departures { get; set; }
+      public Boolean WheelchairAccessible { get; set; }
+    }
+
+    public void DeserializeGenericEnumerableProperty()
+    {
+      BusRun r = JsonConvert.DeserializeObject<BusRun>("{\"Departures\":[\"\\/Date(1309874148734-0400)\\/\",\"\\/Date(1309874148739-0400)\\/\",null],\"WheelchairAccessible\":true}");
+
+      Assert.AreEqual(3, r.Departures.Count());
+      Assert.IsNotNull(r.Departures.ElementAt(0));
+      Assert.IsNotNull(r.Departures.ElementAt(1));
+      Assert.IsNull(r.Departures.ElementAt(2));
+    }
   }
 }

Src/Newtonsoft.Json/Serialization/JsonArrayContract.cs

@@ -55,6 +55,11 @@ namespace Newtonsoft.Json.Serialization
       {
         CollectionItemType = _genericCollectionDefinitionType.GetGenericArguments()[0];
       }
+      else if (underlyingType.IsGenericType && underlyingType.GetGenericTypeDefinition() == typeof(IEnumerable<>))
+      {
+        _genericCollectionDefinitionType =  typeof (IEnumerable<>);
+        CollectionItemType = underlyingType.GetGenericArguments()[0];
+      }
       else
       {
         CollectionItemType = ReflectionUtils.GetCollectionItemType(UnderlyingType);
@@ -105,9 +110,13 @@ namespace Newtonsoft.Json.Serialization
       {
         _genericWrapperType = ReflectionUtils.MakeGenericType(typeof (CollectionWrapper<>), CollectionItemType);
 
-        Type constructorArgument = (ReflectionUtils.InheritsGenericDefinition(_genericCollectionDefinitionType, typeof (List<>)))
-                                     ? ReflectionUtils.MakeGenericType(typeof (ICollection<>), CollectionItemType)
-                                     : _genericCollectionDefinitionType;
+        Type constructorArgument;
+
+        if (ReflectionUtils.InheritsGenericDefinition(_genericCollectionDefinitionType, typeof(List<>))
+          || _genericCollectionDefinitionType.GetGenericTypeDefinition() == typeof(IEnumerable<>))
+          constructorArgument = ReflectionUtils.MakeGenericType(typeof(ICollection<>), CollectionItemType);
+        else
+          constructorArgument = _genericCollectionDefinitionType;
 
         ConstructorInfo genericWrapperConstructor = _genericWrapperType.GetConstructor(new[] { constructorArgument });
         _genericWrapperCreator = JsonTypeReflector.ReflectionDelegateFactory.CreateMethodCall<object>(genericWrapperConstructor);