使用Unity DI创建嵌套的生存期作用域

Question

I have a Web API project that uses Unity as the GlobalConfiguration.Configuration.DependencyResolver . The project uses the Unit of work pattern with a single data access layer that is kept in-memory throughout the lifetime of each request. At the end of each request events are fired, I want to execute the events using their own unique data access layer so that they can be run in parallel (sharing causes concurrency issues).

How can I create a child lifetime scope within a Http request context?

I have access to a static instance of UnityDependencyResolver which has the method IDependencyScope BeginScope() , but given it implements System.Web.Http.Dependencies.IDependencyResolver it seems using that is not the correct option?

With other DI frameworks such as Autofac, it would be:

using(var scope = container.BeginLifetimeScope())
{
  var service = scope.Resolve<IService>();

  using(var nestedScope = scope.BeginLifetimeScope())
  {
    var anotherService = nestedScope.Resolve<IOther>();
  }
}

I would prefer to move the events to a different process and fire via message queues but it is not possible at this time.

Answer 1

Unity container can create child container :

using(var scope = container.CreateChildContainer())
{
  var service = scope.Resolve<IService>();

  using(var nestedScope = scope.CreateChildContainer())
  {
    var anotherService = nestedScope.Resolve<IOther>();
  }
}

Combine it with different lifetime managers ( HierarchicalLifetimeManager for example) and you can your result.