找到了多个与名为“Default”的控制器匹配的类型
解决办法:
public static void RegisterRoutes(RouteCollection routes){
routes.IgnoreRoute("{resource}.axd/{*pathInfo}");
routes.MapRoute(
name: "Default",
url: "{controller}/{action}/{id}",
defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional },
namespaces:new string[] { "CMSManage.Controllers" }
);
}