Unit Of Work for non-trivial CRUD operations for multiple Repositories?

It would seem that even complicated updates can be broken down into a series of modifications to one or more DomainObjects. Calling DoSomeNonSimpleUpdateHere() may modify several different DomainObjects, which would trigger corresponding calls to UnitOfWork. RegisterDirty(DomainObject) for each object.

In the sample code below, I have replaced the call to DoSomeNonSimpleUpdateHere with code that removes inactive users from the system.

The fact that you have this problem suggests that you aren't using the Repository pattern as such, but something more like multiple table data gateways. Generally, a repository is for loading and saving an aggregate root. As such, when you save an entity, your persistence layer saves all the changes in that aggregate root entity instance's object graph.

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