Force lowercase property names from Json() in ASP.NET MVC

Question

Given the following class,

public class Result
{      
    public bool Success { get; set; }

    public string Message { get; set; }
}

I a

Answer 1

Changing serializer is simple if you are using Web API, but unfortunately MVC itself uses JavaScriptSerializer with no option to change this to use JSON.Net.

James' answer and Daniel's answer give you the flexibility of JSON.Net but means that everywhere where you would normally do return Json(obj) you have to change to return new JsonNetResult(obj) or similar which if you have a big project could prove a problem, and also isn't very flexible if you change your mind on the serializer you want to use.

---

I've decided to go down the ActionFilter route. The below code allows you to take any action using JsonResult and simply apply an attribute to it to use JSON.Net (with lower case properties):

[JsonNetFilter]
[HttpPost]
public ActionResult SomeJson()
{
    return Json(new { Hello = "world" });
}

// outputs: { "hello": "world" }

You can even set this up to automagically apply to all actions (with only the minor performance hit of an is check):

FilterConfig.cs

// ...
filters.Add(new JsonNetFilterAttribute());

---

The code

public class JsonNetFilterAttribute : ActionFilterAttribute
{
    public override void OnActionExecuted(ActionExecutedContext filterContext)
    {
        if (filterContext.Result is JsonResult == false)
            return;

        filterContext.Result = new CustomJsonResult((JsonResult)filterContext.Result);
    }

    private class CustomJsonResult : JsonResult
    {
        public CustomJsonResult(JsonResult jsonResult)
        {
            this.ContentEncoding = jsonResult.ContentEncoding;
            this.ContentType = jsonResult.ContentType;
            this.Data = jsonResult.Data;
            this.JsonRequestBehavior = jsonResult.JsonRequestBehavior;
            this.MaxJsonLength = jsonResult.MaxJsonLength;
            this.RecursionLimit = jsonResult.RecursionLimit;
        }

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

            if (this.JsonRequestBehavior == JsonRequestBehavior.DenyGet
                && String.Equals(context.HttpContext.Request.HttpMethod, "GET", StringComparison.OrdinalIgnoreCase))
                throw new InvalidOperationException("GET not allowed! Change JsonRequestBehavior to AllowGet.");

            var response = context.HttpContext.Response;

            response.ContentType = String.IsNullOrEmpty(this.ContentType) ? "application/json" : this.ContentType;

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

            if (this.Data != null)
            {
                var json = JsonConvert.SerializeObject(
                    this.Data,
                    new JsonSerializerSettings
                        {
                            ContractResolver = new CamelCasePropertyNamesContractResolver()
                        });

                response.Write(json);
            }
        }
    }
}