how to use built-in content type negotiation and just get access to the decision

Question

I wanted to take advantage of built-in content negotiator and just get access to decision what formatter is going to be used. I don't want to use Request.Headers.Accept and check for whether it is json or xml content type because there lot of things are involved in that decision. Is there a way I can check at controller level or override any class that tells me what formatter going to be used OR what request content type is?

thanks in advance.

Answer 1

You can run conneg manually:

var conneg = Configuration.Services.GetContentNegotiator();
        var connegResult = conneg.Negotiate(
            typeof(YOUR_TYPE), Request, Configuration.Formatters
        );

And use the output whichever way you want:

//the valid media type
var mediaType = connegResult.MediaType;
//do stuff

//the relevant formatter
var formatter = connegResult.Formatter;
//do stuff