WebApi Action过滤器调用两次

Question

我的WebApi过滤方法OnActionExecuted被调用两次.我的过滤器(我尽可能简单):

   public class NHibernateActionFilter : ActionFilterAttribute
   { 
        //  [Inject]
        //   public ISessionFactoryProvider sessionFactoryProvider { get; set; }
        public override void OnActionExecuted(HttpActionExecutedContext actionExecutedContext)
        {
           var a = 5;
           var b = a;
           //new BaseSessionProvider(sessionFactoryProvider).EndContextSession();
        }
    }

我的设置:

    protected void Application_Start()
    {
        AreaRegistration.RegisterAllAreas();
        WebApiConfig.Register(GlobalConfiguration.Configuration);
        //http://stackoverflow.com/questions/9521040/how-to-add-global-asp-net-web-api-filters
        FilterConfig.RegisterWebApiFilters(GlobalConfiguration.Configuration.Filters);
    }

    public class FilterConfig
    {

        public static void RegisterWebApiFilters(System.Web.Http.Filters.HttpFilterCollection filters)
        {
             filters.Add(new NHibernateActionFilter());
        }
     }

在调试器中,我OnActionExecuted用相同的方法捕获两次actionExecutedContext.为什么？

UPD

Controller
public class BankSmsController : ApiController
{
         [AcceptVerbs(HttpVerbs.Get)]
         public int GetTest()
         {
             return 1;
         }
}

Answer 1

我有一个怀疑,这个奇怪的行为可以通过覆盖AllowMultiplefilter的属性并返回false 来修复,或者将AttributeUsage属性AllowMultiple设置为false也是如此(这会影响AllowMultiplefilter 的属性的默认实现).

至少在我们的项目中这有帮助(我们通过Autofac注入过滤器).