how define routing for MVC application when get takes one nullable parameter

Question

I expect following behaviour: when calling http://localhost:59060/api/games/ - it returns all games, when calling http://localhost:59060/api/games/aaa - it returns all games where DeviceId = aaa.

Currently when I call http://localhost:59060/api/games/aaa or http://localhost:59060/api/games/, error is:

No HTTP resource was found that matches the request URI http://localhost:59060/api/games/ No action was found on the controller 'Games' that matches the request.

Controller

public class GamesController : ApiController
{
    private List<Game> _GamesRepository;

    public GamesController()
    {
        _GamesRepository = CreateGamesRepository();
    }

    // GET api/Games/0xa16
    public IEnumerable<Game> Get(string deviceId)
    {
        if (String.IsNullOrEmpty(deviceId))
        {
            return _GamesRepository;
        }
        else
        {
            return _GamesRepository.Where(x => x.DeviceId == deviceId);
        }

    }
}

Configuration

public class RouteConfig
{
    public static void RegisterRoutes(RouteCollection routes)
    {
        routes.IgnoreRoute("{resource}.axd/{*pathInfo}"); 

        routes.MapRoute(
            name: "ControllerDefault",
            url: "{controller}/{action}/{id}",
            defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }
        );

        routes.MapRoute(
            name: "ApiDefault2",
            url: "api/{controller}/{action}/{deviceId}",
            defaults: new { action = "get", deviceId = UrlParameter.Optional }
        );

Model

public class Game
{
    public int TaskId { get; set; }
    public string SalesForceId { get; set; }
    public string Name { get; set; }
    public string Thumbnail { get; set; }
    public string DeviceId { get; set; }
}

Andrei Olariu · Accepted Answer · 2016-10-11 11:25:42Z

1

In your WebApiConfig class, before the "DefaultApi" route you can register your route as follows:

config.Routes.MapHttpRoute(
    name: "GetGamesRoute",
    routeTemplate: "api/games/{deviceId}",
    new { controller = "games", action = "get", deviceId = RouteParameter.Optional }
);

// This is the default route
config.Routes.MapHttpRoute(
    name: "DefaultApi",
    routeTemplate: "api/{controller}/{id}",
    defaults: new { id = RouteParameter.Optional }
);

Also, make the deviceId parameter optional:

// GET api/Games/0xa16
public IEnumerable<Game> Get(string deviceId = null)

answered Oct 11, 2016 at 11:25

Andrei Olariu

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