Override asp.net mvc JsonResult with the fast ServiceStack JsonSerializer

ApplicationController.cs

public abstract class ApplicationController : Controller
    {
        protected ActionResult RespondTo(Action<FormatCollection> format) {
            return new FormatResult(format);
        }

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

ServiceStackJsonResult.cs

    public class ServiceStackJsonResult : JsonResult
    {
        public override void ExecuteResult(ControllerContext context) {
            HttpResponseBase response = context.HttpContext.Response;
            response.ContentType = !String.IsNullOrEmpty(ContentType) ? ContentType : "application/json";

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

            if (Data != null) {
                response.Write(JsonSerializer.SerializeToString(Data));
            }
        }
    }

Looks great,
Thanks