asp.net mvc - C# ASP .Net MVC 4 variable length route mapping -

i need variable length route mapping in asp.net mvc 3. understanding can map routes this:

routes.maproute(             "default", // route name             "{controller}/{action}/{id}", // url parameters             new { controller = "home", action = "index", id = urlparameter.optional } ); 

but how add variable amount of parameters. routes in application have directory structure starting base address this: www.mywebsite.com/root/

anything followed root has directory structure this:

www.mywebsite.com/root/directory1/directory2/image.jpg

that correspond mapping this:

routes.maproute(             "default", // route name             "root/{path}", // url parameters             new { controller = "directorybrowser", action = "browse" } ); 

but don't know how set path parameter.

you can use wildcard parameter: "root/{*path}"