Newtonsoft Json Results for MVC

BaseController.cs

using System;
using System.Linq;
using System.Web.Mvc;

public abstract class BaseController : Controller
{
    protected override JsonResult Json(object data, string contentType, System.Text.Encoding contentEncoding)
    {
        return new JsonNetResult
        {
            ContentType = contentType,
            ContentEncoding = contentEncoding,
            Data = data
        };
    }

    protected override JsonResult Json(object data, string contentType, System.Text.Encoding contentEncoding, JsonRequestBehavior behavior)
    {
        return new JsonNetResult
                    {
                        ContentType = contentType,
                        ContentEncoding = contentEncoding,
                        Data = data,
                        JsonRequestBehavior = behavior
                    };
    }
}

JsonNetResult.cs

using System;
using System.Web;
using System.Web.Mvc;
using Newtonsoft.Json;

/// <summary>
/// A <see cref="JsonResult"/> implementation that uses JSON.NET to
/// perform the serialization.
/// </summary>
public class JsonNetResult : JsonResult
{
//        public JsonRequestBehavior JsonRequestBehavior { get; set; }
//        public Encoding ContentEncoding { get; set; }
//        public string ContentType { get; set; }
//        public object Data { get; set; }

    public JsonSerializerSettings SerializerSettings { get; set; }
    public Formatting Formatting { get; set; }

    public JsonNetResult()
    {
        Formatting = Formatting.None;
        SerializerSettings = new JsonSerializerSettings();
        JsonRequestBehavior = JsonRequestBehavior.DenyGet;
    }

    public override void ExecuteResult(ControllerContext context)
    {
        if (context == null)
            throw new ArgumentNullException("context");

        if (JsonRequestBehavior == JsonRequestBehavior.DenyGet
            && String.Equals(context.HttpContext.Request.HttpMethod, "GET", StringComparison.OrdinalIgnoreCase))
        {
            throw new InvalidOperationException("This request has been blocked because sensitive information could be disclosed to third party web sites when this is used in a GET request. To allow GET requests, set JsonRequestBehavior to AllowGet.");
        }

        HttpResponseBase response = context.HttpContext.Response;

        response.ContentType = !string.IsNullOrEmpty(ContentType)
                                    ? ContentType
                                    : "application/json";

        if (ContentEncoding != null)
            response.ContentEncoding = ContentEncoding;

        if (Data != null)
        {
            var writer = new JsonTextWriter(response.Output) { Formatting = Formatting };
                
            var serializer = JsonSerializer.Create(SerializerSettings);
            serializer.Serialize(writer, Data);

            writer.Flush();
        }
    }
}

Works like a charm, thanks!

Only discomfort is if I use this code, great stuff BTW, I must always cast to 'JsonResult', e.g.

[HttpGet]
[ChildActionOnly]
public JsonNetResult IndexData()
{
    var bundles = Db.PointsBundles;
    var model = new PointsBundleBundleIndexViewModel();
    model.MapItems(bundles);
    return (JsonNetResult)Json(model, null, null, JsonRequestBehavior.DenyGet);
}

@bradykelly better solution, just make your method public ActionResult Index() no reason to need to return JsonNetResult specifically.