ASP.NET WebApi Action Filters and Dependency Scope

In order to flush changes to RavenDB in ASP.NET WebApi I created the following Action Filter: ``` public class RavenDbUnitOfWorkAttribute : ActionFilterAttribute { public Func<IDocumentSession> SessionFactory { get; set; } public override void OnActionExecuted(HttpActionExecutedContext actionExecutedContext) { var session = SessionFactory.Invoke(); if (session != null && actionExecutedContext.Exception == null) { session.SaveChanges(); } base.OnActionExecuted(actionExecutedContext); } } ``` To inject the `IDocumentSession` I created a custom `IFilterProvider` that loops through each filter and sets any dependencies using setter injection (StructureMap). I would like to know how instances of `IFilterProvider` are scoped. Reading this article it appears Controllers are created per request. Currently I'm explicitly scoping the `IDocumentSession` per request using StructureMap. The question is, if I instead rely on the `IDependencyScope` (that uses a nested container) would the same instance of `IDocumentSession` be injected into my Action Filter? [Update] Testing further it would seem that Action Filters do not use the same dependency scope as a Controller. I'd prefer not to have the code for flushing the session in my Controller however.