ASP.NET Action Result for JSONP (JSON + Padding)

JsonpResult.cs

using System;
using System.Text;
using System.Web;
using System.Web.Mvc;
using System.Web.Script.Serialization;

namespace NikCodes.ActionResults
{
    public class JsonpResult : ActionResult
    {
        public string CallbackFunction { get; set; }
        public Encoding ContentEncoding { get; set; }
        public string ContentType { get; set; }
        public object Data { get; set; }

        public JsonpResult(object data):this(data, null){}
        public JsonpResult(object data, string callbackFunction)
        {
            Data = data;
            CallbackFunction = callbackFunction;
        }


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

            HttpResponseBase response = context.HttpContext.Response;

            response.ContentType = string.IsNullOrEmpty(ContentType) ? "application/x-javascript" : ContentType;

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

            if (Data != null)
            {
                HttpRequestBase request = context.HttpContext.Request;

                var callback = CallbackFunction ?? request.Params["callback"] ?? "callback";

#pragma warning disable 0618 // JavaScriptSerializer is no longer obsolete
                var serializer = new JavaScriptSerializer();
                response.Write(string.Format("{0}({1});", callback, serializer.Serialize(Data)));
#pragma warning restore 0618
            }
        }
    }
}