Efficient JSON communication in ASP.NET MVC

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web.Mvc;
using SenseNet.ContentRepository.Storage;
using SenseNet.ContentRepository.Storage.Security;
using System.Web.Script.Serialization;
using System.Runtime.Serialization.Json;

namespace SenseNet.Services.ContentStore
{
    public class JsonFilter : ActionFilterAttribute
    {
        public string Param { get; set; }
        public Type DataType { get; set; }

        public override void OnActionExecuting(ActionExecutingContext filterContext)
        {
            if (filterContext.HttpContext.Request.ContentType.Contains("application/json"))
            {
                DataContractJsonSerializer ser = new DataContractJsonSerializer(DataType);
                var data = ser.ReadObject(filterContext.HttpContext.Request.InputStream);
                filterContext.ActionParameters[Param] = data;

            }
        }
    }
    public class SecurityController : Controller
    {

        public ActionResult GetACL(string path)
        {
            var node = Node.LoadNode(path);
            var acl = node.Security.GetAcl();
            return Json(acl);
        }

        [AcceptVerbs(HttpVerbs.Post)]
        [JsonFilter(DataType = typeof(SnAccessControlList), Param = "acl")]
        public ActionResult SetACL(SnAccessControlList acl)
        {
            var node = Node.LoadNode(acl.Path);
            node.Security.SetAcl(acl);
            return null; 
        }
    }

}