Question

How do I use UriPathExtensionMapping in MVC4? I’ve added the mapping in the formatter such that:

MediaTypeMappings.Add(new UriPathExtensionMapping("json", new MediaTypeHeaderValue("application/json"))

But I can’t use the extension on my route unless I add a verb, such as:

routes.MapHttpRoute(
            name: "DefaultApi",
            routeTemplate: "api/{controller}.{extension}"

        );

Then it’ll recognize my desired media type, but it also starts expecting “extension” as a parameter on the action. Example:

    public object Get(string extension)
    {
    }

Instead of just:

    public object Get()
    {
    }

How can I resolve this?

Thanks!

Answer 1

I don’t remember if I noticed this problem, but it might be because I explicitly specified the default value for the extension like:

var rF = routes.MapHttpRoute(
    name: "DefaultApi.v1.format",
    routeTemplate: "api/1/{controller}/{action}.{format}/{*id}",
    defaults: new { id = RouteParameter.Optional, format = "json", version = 1 }
);

*note format = "json" in the line beginning with defaults.

I did also notice that this sometimes doesn’t work on requests with trailing parameters for id, like ~/api/1/values/get.json/4.