Custom Json.NET serializer settings per type

Question

I am using an ApiController which uses the global HttpConfiguration class to specify the JsonFormatter settings. I can globally set serialization settings as follows very easily:

config.Formatters.JsonFormatter.SerializerSettings.PreserveReferencesHandling = PreserveReferencesHandling.Objects;

The problem is that not all settings apply to all types in my project. I want to specify custom TypeNameHandling and Binder options for specific types that perform polymorphic serialization.

How can I specify JsonFormatter.SerializationSettings on a per-type or at the least on a per-ApiController basis?

For apicontroller based config, you can take a look at per-controller configuration feature: blogs.msdn.com/b/jmstall/archive/2012/05/11/… . this post is a old one, but most of the stuff should be relevant for the latest bits too. — Kiran
– Kiran, Commented Jul 16, 2013 at 19:19
I tried resorting to per-controller configuration using the IControllerConfiguration attribute like you have suggested. The settings I am specifying in the Initialize function for the JsonFormatter are actually being re-used by requests and are being applied to other controllers. I only applied the attribute to one particular controller. This seems like a bug. — Trevor Elliott
– Trevor Elliott, Commented Jul 17, 2013 at 18:56

Kiran · Accepted Answer · 2013-07-17 19:13:43Z

Based on your comment above, following is an example of per-controller configuration:

[MyControllerConfig] public class ValuesController : ApiController

[AttributeUsage(AttributeTargets.Class, AllowMultiple = false, Inherited = true)] public class MyControllerConfigAttribute : Attribute, IControllerConfiguration { public void Initialize(HttpControllerSettings controllerSettings, HttpControllerDescriptor controllerDescriptor) { //remove the existing Json formatter as this is the global formatter and changing any setting on it //would effect other controllers too. controllerSettings.Formatters.Remove(controllerSettings.Formatters.JsonFormatter); JsonMediaTypeFormatter formatter = new JsonMediaTypeFormatter(); formatter.SerializerSettings.PreserveReferencesHandling = PreserveReferencesHandling.All; controllerSettings.Formatters.Insert(0, formatter); } }

Do you think you could point me in the right direction to make this argument work per Controller Method?

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