RegisterExportFactory in Unity

UnityContainerExtensions.cs

namespace Unity.Extensions {
    using Microsoft.Practices.Unity;
    public static class UnityContainerExtensions
    {
        public static IUnityContainer RegisterExportFactory<T>(this IUnityContainer container)
        {
            return container.RegisterType<ExportFactory<T>>(new InjectionFactory(CreateExportFactory<T>));
        }

        private static ExportFactory<T> CreateExportFactory<T>(IUnityContainer container, Type type, string name)
        {
            Func<IUnityContainer> beginScope = container.CreateChildContainer;

            var factory = new ExportFactory<T>(() =>
            {
                var scope = beginScope();
                if (name == null)
                {
                    return Tuple.Create(scope.Resolve<T>(), new Action(scope.Dispose));
                }

                return Tuple.Create(scope.Resolve<T>(name), new Action(scope.Dispose));
            });

            return factory;
        }
    }
}