javascript - What is JSON.NET for? MVC already has a way to convert objects to json -

i looked @ json.net site not getting it... have code ..

  string[] invalidfiles = new string[] { "one.xls", "two.xls", "three.xls" };          return json(new         {             status = "ok",             invalidfiles = invalidfiles         }); 

that turns objects json... looked @ json.net , seems same thing ? missing ? isa simple example of json.net can can

protected internal jsonresult json(object data); 

??

for web api in mvc 4 default serializer json.net library, when returning jsonresult in mvc 4 standard controllers default serializer used javascriptserializer. can create custom jsonresult , override json method in standard controllers use json.net library default.

to use json.net can first create custom result:

   public class jsonnetresult : jsonresult    {     public override void executeresult(controllercontext context)     {         if (context == null)         {             throw new argumentnullexception("controller context");         }          httpresponsebase response = context.httpcontext.response;          if (contentencoding != null)         {             response.contentencoding = contentencoding;         }          var jsondata = jsonconvert.serializeobject(data);          response.contenttype = !string.isnullorempty(contenttype)             ? contenttype             : "application/json";         response.write(jsondata);     } } 

then override json method in base controller method , return json doing:

    protected override jsonresult json(object data, string contenttype, encoding contentencoding, jsonrequestbehavior behavior)     {         return new jsonnetresult() {             data = data,             contenttype = contenttype,             contentencoding = contentencoding         };     }