ASP.NET MVC - prevent fallback to default route if mandatory parameter specified

Question

I have the following route:

    routes.MapRoute(
        "SetPassword",
        "Account/SetPassword/{token}",
        new { controller = "Account", action = "SetPassword" }
    );

and I want the token to be mandatory. But the problem is that if the token is missing, route falls back to the default one:

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

What I want is to return 404 Not Found if someone enters an address like http://mysite.com/Account/SetPassword

How do I specify that the token is mandatory parameter and the routing must stop at this route if controller and action names match the specification?

Polly Shaw · Accepted Answer · 2013-07-31 22:38:51Z

1

One thing that you could do would be to put a Route Constraint on your Default Route, preventing it matching any actions in the Account Controller:

routes.MapRoute(
    name: "Default",
    url: "{controller}/{action}/{id}",
    defaults: new { controller = "Home", 
                        action = "Index", 
                            id = UrlParameter.Optional },
    constraints: new RouteValueDictionary { { "controller", "^(?!Account$).*" } }
);

Another thing that you could do would be to throw an HttpException in your action if Token was empty.

public ActionResult SetPassword(string token)
{
    if (String.IsNullOrEmpty(token))
    {
        throw new HttpException(404, "Page not found");
    }
    ViewBag.Token = token;
    return View();
}

answered Jul 31, 2013 at 22:38

Polly Shaw

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