asp.net-mvc – 为什么MvcApplication.RegisterRoutes被定义为静

public class MvcApplication : System.Web.HttpApplication
{
    /* Why this method is declared as static? */
    public static void RegisterRoutes(RouteCollection routes)
    {
        routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

        routes.MapRoute(
            "Default",// Route name
            "{controller}/{action}/{id}",// URL with parameters
            new { controller = "Home",action = "Index",id = "" }  // Parameter defaults
        );

    }

    protected void Application_Start()
    {
        RegisterRoutes(RouteTable.Routes);
    }
}