我做了一个方法来支持添加对这样如下：

 公共静态无效MapRouteWithOptionalFormat（这RouteCollection路线，
                                              字符串名称，
                                              字符串的URL，
                                              对象的默认值）
{
    路线implicitRoute = routes.MapRoute（名称+-ImplicitFormat
                                          URL，
                                          默认值）;
    implicitRoute.Defaults.Add（格式的String.Empty）;    路线explicitRoute = routes.MapRoute（名称+-ExplicitFormat
                                          网址+。{}格式，
                                          默认值）;
}
 

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

Is it possible to do this (the more general "optional extension" situation crops up in several places in my planned design) with one route? Or do I need to make two routes like this:

routes.MapRoute("News-ImplicitFormat",
                "news",
                new { controller = "News", action = "Browse", format = "" });

routes.MapRoute("News-ExplicitFormat",
                "news.{format}"
                new { controller = "News", action = "Browse" });

It seems like it would be useful to have the routing system support something like:

routes.MapRoute("News",
                "news(.{format})?",
                new { controller = "News", action = "Browse" });

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);
}