public class EntityService : IEntityService
{
 public EntityService(
      IUnitOfWorkFactory unitOfWorkFactory,
      IRepository<Entity> repository,
      IRepository<Entity2> repository2
      )
      {
        this._unitOfWorkFactory = unitOfWorkFactory;
        //... same for other dependencies
      }

  public Entity[] GetItDone()
  {
    using (var uow = _unitOfWorkFactory.Create())
    {
       var entities = _entityRepository
         .GetAllAsQueryable(...)
         .OrderByDescending(..)
         .ThenByDescending(..)
         .ToArray();

       //... logic
       _repository.Update(...);

       //... logic
       // logic with repo2
       _repository2.Update(...);
       _repository2.Create(...);

       //... other logic with repoX

       // until this line the Unit Of Work as a whole :
       // 1. Get this entity
       // 2. Modify this if that and then create another if whatever
       // 3. Send email to a@a.com or whatever
       // 4. Consider the unit of work to be done by definition.
       // If something explodes until this row nothing will be commited to database and the work van be retried.

       // Consider it finished
       uow.Commit(); // internally calls dbcontext.SaveChanges in case you are using EF.
    }
    return entities;
  }

  public interface IUnitOfWork : IDisposable
  {
    void Commit();
  }
}