ASP.NET MVC5 属性路由 - 只有一个匹配操作的模棱两可的操作异常

Question

我有一个不断弹出的奇怪错误，通常是在调试时，我会得到一个路由突然抛出这个异常，并且会继续那个路由，直到我停止调试。奇怪的是我只有一个可以匹配的动作，只有一个具有该名称的动作，只有控制器等。

我的问题是，有没有人遇到过这种奇怪的行为？有什么修复吗？在修复安装 Visual Studio 2019、重新启动等后，这种情况仍然存在。我认为这是项目的问题，但我无法通过谷歌搜索找到任何东西，我什至不知道从哪里开始寻找。它不可能与 RouteConfig.cs 和属性路由中的后备路由匹配，对吧？

更新：即使遵循清理 routeconfig.cs 中类似路由的建议，也会发生在单独的控制器（另一个属性路由控制器）上。下面添加了详细信息。

当前请求在以下操作方法之间存在歧义：

System.Web.Mvc.ActionResult Getquestions(System.String, System.String, System.Web.Mvc.FormCollection) 类型 >Origin2.Controllers.Events2.Events2APIController

System.Web.Mvc.ActionResult Getquestions(System.String, System.String, System.Web.Mvc.FormCollection) 类型 >Origin2.Controllers.Events2.Events2APIController

修剪下来的控制器：

using ...


namespace Origin2.Controllers.Events2
{

    [RoutePrefix("app/api/Events")]


    public class Events2APIController : Controller
    {

        [Route("{code}/questions/GET")]
        [HttpPost]
        public ActionResult Getquestions(string code, string mode, FormCollection collection)
        {
            //CODE LIVES HERE. 
        }

        protected override void OnException(ExceptionContext filterContext)
        {
            ExceptionNotifications.SendNotice(filterContext, null, "Events2 API Controller");
        }


    }

}

精简了 routeconfig.cs

using Origin2.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using System.Web.Routing;
namespace Origin2
{
    public class RouteConfig
    {
        public static void RegisterRoutes(RouteCollection routes)
        {
            routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

            routes.MapMvcAttributeRoutes(); //Attribute Routing Enabled


            //External
            routes.MapRoute(
                name: "External",
                url: "app/external/{id}",
                defaults: new { controller = "External", action = "Index", id = UrlParameter.Optional }
            );

            routes.MapRoute(
                name: "app",
                url: "app/{action}/{*id}",
                defaults: new { controller = "app", action = "Index", id = UrlParameter.Optional }
            );

            routes.MapRoute(
                name: "app2",
                url: "app/{action}",
                defaults: new { controller = "app", action = "Index" }
            );

            routes.MapRoute(
                name: "DefaultApp",
                url: "app/{controller}/{action}/{**id}",
                defaults: new { controller = "app", action = "Index", id = UrlParameter.Optional }
            );
            routes.MapRoute(
                name: "DefaultApp2",
                url: "app/{controller}/{action}",
                defaults: new { controller = "app", action = "Index" }
            );
            routes.MapRoute(
                name: "DebugShorthand",
                url: "debug",
                defaults: new { controller = "app", action = "Debug" }
            );
            routes.MapRoute(
                name: "RootAddress",
                url: "",
                defaults: new { controller = "app", action = "Index" }
            );
            routes.MapRoute(
                name: "DefaultOrigin1",
                url: "app/{*url}",
                defaults: new { controller = "app", action = "SendToOrigin1" }
            );
        }
    }
}

修复 routeconfig.cs 的模糊路由后。

当前请求在以下操作方法之间存在歧义：

Origin2.Controllers.Events2.Events2Controller 类型上的 System.Web.Mvc.ActionResult EventLanding(System.String)

Origin2.Controllers.Events2.Events2Controller 类型上的 System.Web.Mvc.ActionResult EventLanding(System.String)

精简了 Events2Controller：

using Origin2.Models;
using Origin2.Models.Events2;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web.Mvc;
using static Origin2.Models.Events2.EventRoles;

namespace Origin2.Controllers.Events2
{
   [RoutePrefix("app/Events")]
   [Route("{action=index}")] 

  public class Events2Controller : Controller
    {

        [Route("{code}")]
        public ActionResult EventLanding(string code)
        {
            //This will be the public facing thank you handler for all signup activities. 
            if (code.ToUpper() == "AAABD") 
            {
                return View("EventLandingCustom_AAABD");
            }
            return View();
        }

        protected override void OnException(ExceptionContext filterContext)
        {
            ExceptionNotifications.SendNotice(filterContext, null, "Events2 Controller");

            // Redirect on error:
            //filterContext.Result = RedirectToAction("Error", "Index");
        }
   }
}

Answer 1

我觉得这两条路线是一样的

routes.MapRoute(
            name: "DefaultApp",
            url: "app/{controller}/{action}/{**id}",
            defaults: new { controller = "app", action = "Index", id = UrlParameter.Optional }
        );
        routes.MapRoute(
            name: "DefaultApp2",
            url: "app/{controller}/{action}",
            defaults: new { controller = "app", action = "Index" }

尝试注释掉其中之一。