Webapi2.0RouteAttribute出错

Question

这是我的环球。麻ax

    protected void Application_Start()
    {
        RegisterRoutes();
    }

    private static void RegisterRoutes()
    {
        AreaRegistration.RegisterAllAreas();

        GlobalConfiguration.Configure(WebApiConfig.Register);
        FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
        RouteConfig.RegisterRoutes(RouteTable.Routes);

        GlobalConfiguration.Configure(x => x.MapHttpAttributeRoutes());
        GlobalConfiguration.Configuration.EnsureInitialized();
    }

这是我的Web Api控制器

    [RoutePrefix("api/admin/users/")]
    public class UsersController : ApiController
    {
        [Route("get")]
        public IQueryable<User> GetUsers()
        {
            return db.Users;
        }
    }

这是我导航到localhost时遇到的错误：123/api/admin/users/get

The object has not yet been initialized. Ensure that HttpConfiguration.EnsureInitialized() is called in the application's startup code after all other initialization code.

我不知道我在这里做错了什么。我相信我正在为新的WebApi2.0方式做好一切，但我错过了一些东西。

先谢谢你。

更新资料

这是堆栈，以防它有帮助

at System.Web.Http.Routing.RouteCollectionRoute.GetRouteData(String virtualPathRoot, HttpRequestMessage request) 
at System.Web.Http.WebHost.Routing.HttpWebRoute.GetRouteData(HttpContextBase httpContext)

Answer 1

请移走

    GlobalConfiguration.Configure(x => x.MapHttpAttributeRoutes());

从 全球化。麻ax.

然后打电话 MapHttpAttributeRoutes 在 WebApiConfig。政务司司长

    public static void Register(HttpConfiguration config)
    {
        config.MapHttpAttributeRoutes();
    }

Answer 2

在我的情况下，我正在收到这个错误，因为我在webapi之前配置了autofac：

GlobalConfiguration.Configure(WebApiConfig.Register);
GlobalConfiguration.Configure(AutofacConfig.Register);

.

更改订单让我过去这个问题：

GlobalConfiguration.Configure(AutofacConfig.Register);
GlobalConfiguration.Configure(WebApiConfig.Register);

.