ASP.NET MVC Routes with “File Extensions”

Question

I want to make an MVC route for a list of news, which can be served in several formats.

• news -> (X)HTML
• news.rss -> RSS
• news.atom -> ATOM

Answer 1

I made a method to support adding pairs like this as follows:

public static void MapRouteWithOptionalFormat(this RouteCollection routes,
                                              string name,
                                              string url,
                                              object defaults)
{
    Route implicitRoute = routes.MapRoute(name + "-ImplicitFormat",
                                          url,
                                          defaults);
    implicitRoute.Defaults.Add("format", string.Empty);

    Route explicitRoute = routes.MapRoute(name + "-ExplicitFormat",
                                          url + ".{format}",
                                          defaults);
}

Answer 2

You can look into using constraints to make this work with normal routes.

UPDATE: actually, I misread the question. The other answer is the correct thing to do for now. Or create a custom route. We're looking at the idea of optional segments as a possible future feature.