Allow serialization of additional properties of a non-open type

[congysu]

Allow configure EnableFullValidation to false:

            MessageWriterSettings = new ODataMessageWriterSettings
            {
                Indent = true,
                DisableMessageStreamDisposal = true,
                MessageQuotas = new ODataMessageQuotas { MaxReceivedMessageSize = Int64.MaxValue },
                AutoComputePayloadMetadataInJson = true,
            };

https://github.com/OData/WebApi/blob/master/OData/src/System.Web.OData/OData/Formatter/ODataMediaTypeFormatter.cs#L81-L87

or Create a customer odata formatting attribute, and a custom OData controller base class:

+        [CustomODataFormatting]
+        public class CustomODataController : ODataController
+        {
+        }
+
+        [AttributeUsage(AttributeTargets.Class, AllowMultiple = false, Inherited = true)]
+        public class CustomODataFormattingAttribute : Attribute, IControllerConfiguration
+        {
+            public void Initialize(HttpControllerSettings controllerSettings,
+                HttpControllerDescriptor controllerDescriptor)
+            {
+                Func<IList<ODataMediaTypeFormatter>> getODataFormatters =
+                    () => controllerSettings.Formatters.OfType<ODataMediaTypeFormatter>().ToList();
+
+                var odataFormatters = getODataFormatters();
+                if (!odataFormatters.Any())
+                {
+                    new ODataFormattingAttribute().Initialize(controllerSettings, controllerDescriptor);
+                    odataFormatters = getODataFormatters();
+                }
+
+                foreach (var formatter in odataFormatters)
+                {
+                    formatter.MessageWriterSettings.EnableFullValidation = false;
+                }

Related ODataLib issue: OData/odata.net#179

[congysu]

@hotchandanisagar @gkasturi Can we know your option on the issue?