ASP.NET WEB API - CamelCasePropertyNamesContractResolver - force to ignore specific endpoints

Question

I am using ASP.NET web api. To provide support for camel case for the properties that an end point returns, I have added this code:

//Support camel casing
            var jsonFormatter = config.Formatters.OfType<JsonMediaTypeFormatter>().FirstOrDefault();
            jsonFormatter.SerializerSettings.ContractResolver = new CamelCasePropertyNamesContractResolver();

This is working fine but I want to add an exception for one of the endpoints. Which will ensure when the data is returned from that end point, properties are not camel cased. How can I add this exception or a single endpoint?

Answer 1

It's not possible to make control if you are applying a global camel case configuration AFAK the only way to achieve this is by using ActionFilterAttribute something like the following

public class CamelCasingFilterAttribute:ActionFilterAttribute
    {
        private JsonMediaTypeFormatter _camelCasingFormatter = new JsonMediaTypeFormatter();

        public CamelCasingFilterAttribute()
        {
            _camelCasingFormatter.SerializerSettings.ContractResolver = new CamelCasePropertyNamesContractResolver();
        }

        public override void OnActionExecuted(HttpActionExecutedContext actionExecutedContext)
        {
            ObjectContent content = actionExecutedContext.Response.Content as ObjectContent;
            if (content != null)
            {
                if (content.Formatter is JsonMediaTypeFormatter)
                {
                    actionExecutedContext.Response.Content = new ObjectContent(content.ObjectType, content.Value, _camelCasingFormatter);
                }
            }
        }
    }



  public class ValuesController : ApiController
    {
        // GET api/values
        [CamelCasingFilter]
        public IEnumerable<Test> Get()
        {
            return new Test[] {new Test() {Prop1 = "123", Prop2 = "3ERr"}, new Test() {Prop1 = "123", Prop2 = "3ERr"}};  
        }

        // GET api/values/5

        public Test Get(int id)
        {

            return new Test() {Prop1 = "123", Prop2 = "3ERr"};  
        }
    }

    public class Test
    {
        public string Prop1 { get; set; }
        public string Prop2 { get; set; }
    }

if you try to call the first action the answer will like the follwing

[{"prop1":"123","prop2":"3ERr"},{"prop1":"123","prop2":"3ERr"}]

and for the second action given that there is no filter you will get something like this

{
    "prop1": "123",
    "prop2": "3ERr"
}

Note if you want to make it easy controlling camelCase over an entire controller, try to put your action that you want it to send back the answer in a not CamelCase in a controller apart but, for the rest apply this Filter on a controller level if you want. More you should delete the GlobalConfiguration to get this