asp.net-mvc – MVC动作过滤器集合已修改;枚举操作可能无法执行

我们在MVC 5.1.3应用程序中发生这个错误非常频繁，如果发生这种情况，用户必须刷新该页面，并且它会消失，所以它是间歇性的问题。

我们发现诊断似乎很难在框架本身内发生。任何想法在哪里看？

这是完整的堆栈：

System.InvalidoperationException: Collection was modified; enumeration operation may not execute.
   at System.Collections.Generic.List`1.Enumerator.MoveNextRare()
   at System.Web.Mvc.FilterProviderCollection.GetFilters(ControllerContext controllerContext,ActionDescriptor actionDescriptor)
   at System.Web.Mvc.ControllerActionInvoker.GetFilters(ControllerContext controllerContext,ActionDescriptor actionDescriptor)
   at System.Web.Mvc.Async.AsyncControllerActionInvoker.beginInvokeAction(ControllerContext controllerContext,String actionName,AsyncCallBACk callBACk,Object statE)
   at System.Web.Mvc.Async.AsyncControllerActionInvoker.beginInvokeAction(ControllerContext controllerContext,Object statE)
   at System.Web.Mvc.Controller.<BeginExecuteCore>b__1c(AsyncCallBACk asyncCallBACk,Object asyncState,ExecuteCoreState innerStatE)
   at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncVoid`1.CallBeginDelegate(AsyncCallBACk callBACk,Object callBACkStatE)
   at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResultBase`1.begin(AsyncCallBACk callBACk,Object state,Int32 timeout)
   at System.Web.Mvc.Async.AsyncResultWrapper.begin[TState](AsyncCallBACk callBACk,Object callBACkState,BeginInvokeDelegate`1 beginDelegate,EndInvokeVoidDelegate`1 endDelegate,TState invokeState,Object tag,Int32 timeout,SynchronizationContext callBACkSyncContext)
   at System.Web.Mvc.Controller.beginExecuteCore(AsyncCallBACk callBACk,Object statE)
   at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResultBase`1.begin(AsyncCallBACk callBACk,SynchronizationContext callBACkSyncContext)
   at System.Web.Mvc.Controller.beginExecute(requestContext requestContext,Object statE)
   at System.Web.Mvc.MvcHandler.<BeginProcessrequest>b__4(AsyncCallBACk asyncCallBACk,ProcessrequestState innerStatE)
   at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncVoid`1.CallBeginDelegate(AsyncCallBACk callBACk,SynchronizationContext callBACkSyncContext)
   at System.Web.Mvc.MvcHandler.beginProcessrequest(httpContextBase httpContext,Object statE)
   at System.Web.httpApplication.CallHandlerEXECUTIONStep.System.Web.httpApplication.IEXECUTIONStep.Execute()
   at System.Web.httpApplication.CallHandlerEXECUTIONStep.System.Web.httpApplication.IEXECUTIONStep.Execute()
   at System.Web.httpApplication.ExecuteStep(IEXECUTIONStep step,Boolean& completedSynchronously)

之前有一个类似的问题：Collection was modified; enumeration operation may not execute，但这是通过升级到MVC 5解决的，我们已经在5。

for (int i = 0; i < providers.Length; i++)
        {
            IFilterProvider provider = providers[i];
            foreach (Filter filter in provider.GetFilters(controllerContext,actionDescriptor))
            {
                filters.Add(filter);
            }
        }