Custom EnableQueryAttribute to enable odata $inlinecount

EnableQueryCustomAttribute.cs

using System;
using System.Linq;
using System.Net.Http;
using System.Web.Http.Filters;
using System.Web.Http.OData;
using static System.Activator;
using static System.Net.HttpStatusCode;

namespace Conecta2.Web.Infraestrutura.Filter
{
    public sealed class EnableQueryCustomAttribute : EnableQueryAttribute
    {
        private static readonly Type PageResultType = typeof(PageResult<>);
        private const string MS_INLINECOUNT = "MS_InlineCount";

        public override void OnActionExecuted(HttpActionExecutedContext context)
        {
            IQueryable query;
            base.OnActionExecuted(context);
            if (context.Response.TryGetContentValue(out query))
            {
                var request = context.Request;
                var properties = request.Properties;
                if (properties.ContainsKey(MS_INLINECOUNT))
                {
                    var total = (long?)properties[MS_INLINECOUNT];
                    context.Response = request.CreateResponse(OK, CreateInstance(PageResultType.MakeGenericType(query.ElementType), query, default(Uri), total));
                }
            }
        }
    }
}