New Post: IUnitOfWork in project silk

They did it so they could use Unity to inject a DBContext into the repositories. DBContext doesn't otherwise implement an interface, although it does have a SaveChanges method already so technically already implements IUnitOfWork. But they really need to DI that reference to the DBContext into the repositories, so they wrote a hack. The whole BaseRepository falls apart if the IUnitOfWork implementation you give it isn't a DbContext.

So in essence, while pretending to be using DI to loosely couple the repositories and the DBContext, they just mask the tight coupling. The worst of both worlds!