为同一页面创建两个路由选项（MVC）

Question

我希望能够以两种不同的方式访问同一页面：

首先，使用参数显示一些特定信息。

        routes.MapRoute(
            "About",
            "About/{id}",
            new { controller = "About", action = "Index" }
        );

其次，没有参数，以显示一般事物。

        routes.MapRoute(
            "About",
            "About",
            new { controller = "About", action = "Index" }
        );  

如何建立接受这两种选择的路线？

Answer 1

routes.MapRoute(
    "About",
    "About/{id}",
    new { controller = "About", action = "Index", id = UrlParameter.Optional }
);

然后：

public ActionResult Index(string id)
{
    // if id = null => /About was requested
    // if id != null => /About/abc was requested
    ...
}