https://nblumhardt.com/2011/01/an-autofac-lifetime-primer/
Or, “Avoiding Memory Leaks in Managed Composition”
Understanding lifetime can be pretty tough when you’re new to IoC. Even long-time users express vague fears and misgivings when it comes to this subject, and disconcerting issues – components not being disposed, steadily climbing memory usage or an OutOfMemoryException – have bitten many of us at one time or another.
Avoiding lifetime issues when using an IoC container is generally straightforward, but doing so successfully is more a question of application design rather than just container API usage. There’s lots of good advice out there, but very little of it tells the complete story from beginning to end. I’ve attempted to do that with this rather long article, and hope that with a bit of feedback from you it can be shaped into a useful reference.
This article is about Autofac, but the broad issues are universal – even if you’re not an Autofac user, chances are there’s something to learn about your container of choice.