找到多个与控制器匹配的类型

我正在尝试使用header来api versioning，但在different folder structure中，如下所示。

在Controller folder中，在CustomerController.cs中有V1子文件夹和

在Controller folder中，CustomerController.cs 内有V2子文件夹

当我使用URL以上的用户api版本时，工作正常。

我的问题是，当我用header尝试这种方法时，它会给我以下错误：

｛"Message"："发生错误。"，"ExceptionMessage"："发现多个类型与名为"customer"的控制器匹配。如果为该请求提供服务的路由（"api/｛controller｝/｛id｝"）找到多个用名称相同但命名空间不同，这是不受支持的。''''r''n''r''n"customer"的请求已找到以下匹配项控制器：''r''nApiVersion.controllers.V1.CustomerController''r''nApiVersion.controllers.V2.CustomerController"，"ExceptionType"："System.InvalidOperationException"，"StackTrace"："在System.Web.Http.Dispatcher.DefaultHttpControllerSelector.SelectController（HttpRequestMessage请求）''r''nSystem.Web.Http.Dispatcher.HttpControllerDispatcher.d__1.MoveNext（）"}

WebApiConfig.cs

 public static void Register(HttpConfiguration config)
        {
            config.MapHttpAttributeRoutes();
            config.Routes.MapHttpRoute(
                name: "DefaultApi",
                routeTemplate: "api/{controller}/{id}",
                defaults: new { id = RouteParameter.Optional }
            );
        }

自定义控制器选择器.cs

        public override HttpControllerDescriptor SelectController(HttpRequestMessage request)
        {
            var controllers = GetControllerMapping();
            var routeData = request.GetRouteData();
            var controllerName = routeData.Values["controller"].ToString();
            //HttpControllerDescriptor controllerDescriptor;
            var version = GetVersionFromAcceptHeaderVersion(request);
            var controllerKey = String.Format(CultureInfo.InvariantCulture, "{0}.{1}",
                        version, controllerName);

            //if (controllers.TryGetValue(controllerName, out controllerDescriptor))
            // {
            if (!string.IsNullOrEmpty(version))
            {
                HttpControllerDescriptor versionedControllerDescriptor;
                if (controllers.TryGetValue(controllerKey, out versionedControllerDescriptor))
                {
                    return versionedControllerDescriptor;
                }
            }
            return null;
        }
          private string GetVersionFromAcceptHeaderVersion(HttpRequestMessage request)
        {
            var acceptHeader = request.Headers.Accept;
            foreach (var mime in acceptHeader)
            {
                if (mime.MediaType == "application/json" || mime.MediaType == "text/html")
                {
                    var version = mime.Parameters
                                    .Where(v => v.Name.Equals("version", StringComparison.OrdinalIgnoreCase))
                                    .FirstOrDefault();
                    if (version != null)
                    {
                        return version.Value;
                    }
                    return string.Empty;
                }
            }
            return string.Empty;
        }

public class CustomControllerSelector : DefaultHttpControllerSelector
{
    //const string partName = "Webapi.Controllers";
    private readonly HttpConfiguration _config;
    public CustomControllerSelector(HttpConfiguration config)
        : base(config)
    {
        _config = config;
    }
    public override System.Web.Http.Controllers.HttpControllerDescriptor SelectController(HttpRequestMessage request)
    {
        var _route = request.GetRouteData();
        var controllerName = base.GetControllerName(request);
        var type = _config.Services.GetAssembliesResolver();
        var controlles = _config.Services.GetHttpControllerTypeResolver().GetControllerTypes(type);
        object name;
        _route.Values.TryGetValue("route", out name);
        //No more hard coding
        var partName = controllers.FirstOrDefault().Namespace;
        var st = name as string;
        if (st != null)
        {
            var conType = controlles.FirstOrDefault(a => a.Namespace == string.Format("{0}.{1}", partName, st));
                        if (conType != null)
                            return new System.Web.Http.Controllers.HttpControllerDescriptor(_config, controllerName, conType);
        }
        return base.SelectController(request);
    }
}

config.Routes.MapHttpRoute(
            name: "DefaultApi",
            routeTemplate: "api/{controller}/{route}/{id}",
            defaults: new { id = RouteParameter.Optional }
        ); 

http://localhost:60957/api/Another/Route/a
http://localhost:60957/api/Another/Route2/aaaaa