ASP.NET MVC：出现空ActionLinks

问题描述：

我使用的是默认路由，这样我就不需要指定控制器。

I'm using a default route, so that I don't need to specify the controller.

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

有了这个，我可以创造像myapp.com/Customers而不是myapp.com/Home/Customers网址

With this, I can create URLs like myapp.com/Customers rather than myapp.com/Home/Customers

当我在本地测试，一切都很好。当我上传的现场版，与Html.ActionLink产生的任何联系都是空的。我知道我使用的Html.ActionLink正确的，因为它工作本地罚款：

When I test locally, everything is fine. When I upload a live version, any links generated with Html.ActionLink are empty. I know I'm using Html.ActionLink correctly, because it works fine locally:

//                   Title                 Action      Controller
<%: Html.ActionLink("Manage My Settings", "Settings", "Home") %>

我已经删除所有路线，但默认情况下，试图用不带控制器等等。我甚至试图恢复到其在路由控制器指定ActionLink的，例如：

I've removed all routes but the default, tried specifying ActionLink with and without the controller etc. I even tried reverting to having the controller in the route, e.g:

"{controller}/{action}/{id}"

没有什么工作现场。一切工作本地。去稍微疯狂。

Nothing works live. Everything works locally. Going slightly mad.

更新：

OK，做了一个奇怪的发现。其实我有身份证后，被称为第一个可选UrlParameter。我愣神没有包括在本例中，因为我认为这并没有区别。如果我把它拿出来，事情似乎工作。

OK, made a strange discovery. I actually had another optional UrlParameter after id, called page. I stupidly didn't include it in the example because I thought it made no difference. If I take it out, things seem to work.

所以，实际上，这个作品：

So, actually, this works:

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

和这个的作品！

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

不过的这个的做的未的作品

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

为什么不呢？

答

找到了答案！有使用两个连续的可选UrlParameters当MVC3一个bug，通过菲尔哈克越详细，这里路由回归与两连续，可选的URL参数

Found the answer! There's a bug in MVC3 when using two consecutive optional UrlParameters, as detailed by Phil Haack, here routing-regression-with-two-consecutive-optional-url-parameters

您需要首先声明一个版本的路线只有一个可选参数。因此，

You need to first declare a version of the route with only one optional parameter. So

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

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

现在似乎真的明显。如果我其实包括所有的细节我敢肯定Serghei或其他人会看到这个问题，所以感谢所有帮助家伙！

Seems really obvious now. If I'd actually included all the details I'm sure Serghei or someone else would have seen the problem, so thanks for all the help guys!

ASP.NET MVC：出现空ActionLinks

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