ApiController与404异常不起作用。

我有一个控制器，它是从System.Web.Http.ApiController派生而来的（使用了Nuget包Microsoft.AspNet.WebApi.Core.5.2.3）。

我在控制器类上使用了RoutePrefix，而在Action上使用了Route属性。

我配置了两个路由。一个在WebAPiConfig（HttpRouteCollection）中，另一个在RouteConfig（System.Web.Routing.RouteCollection）中。

config.Routes.MapHttpRoute(
            name: "DefaultApi",
            routeTemplate: "api/{controller}/{id}",
            defaults: new { id = RouteParameter.Optional });
routes.MapRoute(
            name: "Default",
            url: "{controller}/{action}/{id}",
            defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }
        );

当我在Postman中发送请求时，我收到了404错误代码。奇怪的是堆栈跟踪是：

[HttpException]: 路径“/api/Account/IsAuthorized”的控制器未找到或未实现IController。
at System.Web.Mvc.DefaultControllerFactory.GetControllerInstance(RequestContext requestContext, Type controllerType)
at System.Web.Mvc.DefaultControllerFactory.CreateController(RequestContext requestContext, String controllerName)
at System.Web.Mvc.MvcHandler.ProcessRequestInit(HttpContextBase httpContext, IController& controller, IControllerFactory& factory)
at System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContextBase httpContext, AsyncCallback callback, Object state)
at System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContext httpContext, AsyncCallback callback, Object state)
at System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.BeginProcessRequest(HttpContext context, AsyncCallback cb, Object extraData)
at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step)
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

以下是控制器代码：

using System;
using System.Collections.Generic;
using System.Net;
using System.Net.Http;
using System.Net.Security;
using System.Security.Cryptography.X509Certificates;
using System.Text;
using System.Threading.Tasks;
using System.Web;
using System.Web.Http;
using System.Web.Http.Description;
[RoutePrefix("api/Account")]
public class AccountController : ApiController
{
    /// 

    /// Determines whether this instance is authorized.
    /// 
    /// send whether the user is authorized or not
    [AllowAnonymous]
    [Route("IsAuthorized")]
    [HttpGet]
    public HttpResponseMessage IsAuthorized()
    {
        return Request.CreateResponse(User.Identity.IsAuthenticated);
        ////return true;
    }
}

Global.asax的注册顺序

protected void Application_Start()
    {
        AreaRegistration.RegisterAllAreas();
        UnityConfig.RegisterComponents(HttpConfiguration.Config);
        WebApiConfig.Register(HttpConfiguration.Config);
        FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
        RouteConfig.RegisterRoutes(RouteTable.Routes);
        BundleConfig.RegisterBundles(BundleTable.Bundles);
    }

为什么框架尝试通过System.Web.Mvc.DefaultControllerFactory.GetControllerInstance来初始化控制器

在同一个API项目中，我有另一个由System.Web.Mvc.Controller派生的控制器，它工作得很好。

任何指点都将对我有很大帮助。