Do's and Don'ts of Service Locator usage

Do: always begin injection from a child lifetime scopes

Lifetime scopes are Autofac's concept of "child containers", or nested injection contexts. From any ILifetimeScope you can call .Resolve<MyInterfaceType>() and begin a new child lifetime scope.

Since Autofac is in charge of creating all our objects, we want to make sure that any IDisposable that could potentially leak memory gets rightfully garbage collected. Resolving an IDisposable instance repeatedly from the Root container (i.e. the root lifetime scope) would cause a memory leak in no time.

This is why it's good hygiene to also begin dependency resolution from a child scope. For example:

Don't: add a reference to your ServiceLocator project in your Contracts or Core module projects