路由:当前的动作请求 [...] 在以下动作方法之间是不明确的 [英] Routing: The current request for action [...] is ambiguous between the following action methods

问题描述

我有一个名为 Browse.chtml 的视图，用户可以在其中输入搜索词，或将搜索词留空.输入搜索词时，我想将页面定向到 http://localhost:62019/Gallery/Browse/{Searchterm} 而当没有输入时，我想将浏览器定向到 http://localhost:62019/Gallery/Browse/Start/Here.

I have a View called Browse.chtml, where the user can enter a search term, or leave the search term blank. When entering the search term, I want to direct the page to http://localhost:62019/Gallery/Browse/{Searchterm} and when nothing is entered, I want to direct the browser to http://localhost:62019/Gallery/Browse/Start/Here.

当我尝试这个时，我收到错误:

When I try this, I get the error:

当前对控制器类型GalleryController"的浏览"操作请求在以下操作方法之间不明确:System.Web.Mvc.ActionResult Browse(System.String) on type AutoApp_MVC.Controllers.GalleryControllerSystem.Web.Mvc.ActionResult Browse(Int32, System.String) on type AutoApp_MVC.Controllers.GalleryController

The current request for action 'Browse' on controller type 'GalleryController' is ambiguous between the following action methods: System.Web.Mvc.ActionResult Browse(System.String) on type AutoApp_MVC.Controllers.GalleryController System.Web.Mvc.ActionResult Browse(Int32, System.String) on type AutoApp_MVC.Controllers.GalleryController

我对 MVC 所做的一切都是第一次.我不知道现在还可以尝试什么.

Everything I'm doing with MVC is for the first time. I'm not sure what else to try at this point.

public ActionResult Browse(string id)
{
    var summaries = /* search using id as search term */
    return View(summaries);
}

public ActionResult Browse(string name1, string name2)
{
    var summaries = /* default list when nothing entered */
    return View(summaries);
}

我在 Global.asax.cs 中也有这个:

I also have this in Global.asax.cs:

    routes.MapRoute(
         "StartBrowse",
         "Gallery/Browse/{s1}/{s2}",
         new
         {
             controller = "Gallery",
             action = "Browse",
             s1 = UrlParameter.Optional,
             s2 = UrlParameter.Optional
         });



    routes.MapRoute(
         "ActualBrowse",
         "Gallery/Browse/{searchterm}",
         new
         {
             controller = "Gallery",
             action = "Browse",
             searchterm=UrlParameter.Optional
         });

推荐答案

一个控制器上最多只能有 2 个同名的 action 方法，为了做到这一点，1 个必须是 [HttpPost]，另一个必须是[HttpGet].

You can only have a maximum of 2 action methods with the same name on a controller, and in order to do that, 1 must be [HttpPost], and the other must be [HttpGet].

由于您的两个方法都是 GET，您应该重命名其中一个操作方法或将其移至不同的控制器.

Since both of your methods are GET, you should either rename one of the action methods or move it to a different controller.

尽管您的 2 个 Browse 方法是有效的 C# 重载，但 MVC 操作方法选择器无法确定要调用哪个方法.它将尝试将路由与方法匹配(反之亦然)，并且此算法不是强类型的.

Though your 2 Browse methods are valid C# overloads, the MVC action method selector can't figure out which method to invoke. It will try to match a route to the method (or vice versa), and this algoritm is not strongly-typed.

您可以使用指向不同操作方法的自定义路由来完成您想要的操作:

You can accomplish what you want using custom routes pointing to different action methods:

... 在 Global.asax 中

... in Global.asax

routes.MapRoute( // this route must be declared first, before the one below it
     "StartBrowse",
     "Gallery/Browse/Start/Here",
     new
     {
         controller = "Gallery",
         action = "StartBrowse",
     });

routes.MapRoute(
     "ActualBrowse",
     "Gallery/Browse/{searchterm}",
     new
     {
         controller = "Gallery",
         action = "Browse",
         searchterm = UrlParameter.Optional
     });

...并且在控制器中...

... and in the controller...

public ActionResult Browse(string id)
{
    var summaries = /* search using id as search term */
    return View(summaries);
}

public ActionResult StartBrowse()
{
    var summaries = /* default list when nothing entered */
    return View(summaries);
}

您也许还可以保留名为在控制器中相同，通过应用一个 [ActionName] 属性来区分它.使用与上面相同的 Global.asax，您的控制器将如下所示:

You might also be able to keep the action methods named the same in the controller, by applying an [ActionName] attribute to one to distinguish it. Using the same Global.asax as above, your controller would then look like this:

public ActionResult Browse(string id)
{
    var summaries = /* search using id as search term */
    return View(summaries);
}

[ActionName("StartBrowse")]
public ActionResult Browse()
{
    var summaries = /* default list when nothing entered */
    return View(summaries);
}

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