Web API中的路由/操作已损坏

Question

I have my default route defined in WebApiConfig.cs:

        config.Routes.MapHttpRoute(
            name: "DefaultApi",
            routeTemplate: "api/{controller}/{id}",
            defaults: new { id = RouteParameter.Optional, page = 20, offset = 0 }
        );

and in my controller, I have an action:

    // GET api/users
    [HttpGet]
    public IEnumerable<User> Get(string id, int page, int offset)
    {
        return id != null 
            ? new User[]{Get(id)} 
            : _userService.All().Skip(offset*page).Take(page);
    }

I know this was recently working, but now I'm getting the infamous "No action was found on the controller 'Users' that matches the request" error. I can't seem to figure what (if anything) changed. I've undone all my changes since adding the defaults for page/offset and still nothing.

any ideas?

request url: http://localhost/api/api/Users

Answer 1

Here parameter 'id' is optional, but the action selector expects to specify a default value for it on the action.

public IEnumerable Get(string id = null , int page, int offset)

Also regarding the url, probably a typo, you mean http://localhost/api/Users and not http://localhost/**api/api**/Users

Answer 2

You haven't specified an Action in your route. You either need to add an {action} piece to your URL, or specify the action in your default object.