MVC route, query parameters - asp.net-mvc

Question

Two simple mvc3 routes, username and a default catch all.
routes.MapRoute(
"Users",
"{username}",
new { controller = "User", action = "Index"}
);
routes.MapRoute(
"Default",
"{*url}",
new { controller = "Default", action = "Index" }
);
How do you make the user route accept any extra query parameters like /username?ref=facebook
This example just heads of to default route...
EDIT:
MY BAD, was a bit surprised by this as it shouldn't care about query parameters.
Solution = clean and rebuild project.

Answer 1

Update your first route as follow:
routes.MapRoute(
"Users",
"/username",
new { controller = "User", action = "Index"}
);
In your controller Action add a parameter "ref" so that it MVC automatically passes the query string "ref" to your controller.

Answer 2

Query string parameters like ?ref= are not part of the Route segment definition. For example, a route llike:
routes.MapRoute(
"Default",
"{controller}/{action}",
new { controller = "Home", action = "Index"}
);
Would still match a URL like: /Home/Index?ref=facebook.
So you don't have to change your routes to accommodate ad hoc Query String. Handling them in your Actions/Controller is a different story, because you will have to follow and CoC Convention over Configuration guidelines and match the Query String parameter in your Actions.

Answer 3

Add the parameter to the route, and don't forget to add it to your action.
I would suggest adding something to the beginning of the urls to make it a bit more specific (in case you add any other routes to your project)
Example
routes.MapRoute(
"Users",
"users/{username}/{ref}",
new { controller = "User", action = "Index", ref = UrlParameter.Optional }
);
and in your action you'd want
public ActionResult Index(ref)
{
if (string.IsNullOrEmpty(ref))
{
//TODO: add your logic here
}
}
This should accept /users/someusername/facebook.com OR /users/someusername?ref=facebook.com