c# - 无法使 ActionLink 或 RouteLink 生成正确的 URL

Question

我是 ASP.NET MVC(使用版本 3)的新手，无法让 ActionLink 或 RouteLink 像我期望的那样工作。在这个应用程序中，一个事件可以有很多事件，我希望使用以下方式路由到他们:

/Event/1/Activity/Event/1/Activity/Index  (same as previous)/Event/1/Activity/Details/5

The HTML generated by these two helpers always looks like:

/Event/1

Here's the code...

View Razor HTML

@Html.RouteLink("View Sessions", "SubControllerIndex",
    new { eventId = Model.Id, controller = "Activity", action = "Index" })
@Html.ActionLink("View Sessions", "Index", "Activity", new { eventId = Model.Id }, null)

路由映射

routes.MapRoute(
    "SubControllerIndex",
    "Event/{eventId}/{controller}",
    new { controller = "Activity", action = "Index" },
    new { eventId = @"\d+" }
);
routes.MapRoute(
    "ActivityIndex",
    "Event/{eventId}/{controller}/{action}/{id}",
    new { controller = "Activity", action = "Index", id = UrlParameter.Optional },
    new { eventId = @"\d+", id = @"\d*" }
);
routes.MapRoute(
    "Default", // Route name
    "{controller}/{action}/{id}", // URL with parameters
    new { controller = "Home", action = "Index", id = UrlParameter.Optional }, // Parameter defaults
    new { id = @"\d*" }
);

事件 Controller

public ActionResult Index(long eventId)
{
    var activities = _context.Activities.Where(a => a.Event.Id == eventId).ToList();
    return View(activities);
}

知道我在这里做错了什么吗？

Answer 1

路由系统为路由生成/Event/1而不是/Event/1/Activity/Index的原因

routes.MapRoute(
   "ActivityIndex",
   "Event/{eventId}/{controller}/{action}/{id}",
   new { controller = "Activity", action = "Index", id = UrlParameter.Optional },
   new { eventId = @"\d+", id = @"\d*" }
);

是因为在生成 url 时系统不会在 url 中包含任何默认值。在这种情况下，controller 的默认值是 Activity，action 的默认值是 Index。因此，

@Html.RouteLink("View Sessions", "SubControllerIndex",
    new { eventId = Model.Id, controller = "Activity", action = "Index" })

将生成 /Event/1 而不是 /Event/1/Activity/Index。如果您单击该链接，您仍然应该转到 ActivityController 上的 Index 操作方法。