public class MyDbContext : AbpDbContext
{public DbSet<Product> Products { get; set; }public MyDbContext(DbContextOptions<MyDbContext> options): base(options){}
}

services.AddAbpDbContext<MyDbContext>(options =>
{options.DbContextOptions.UseSqlServer(options.ConnectionString);
});

Configuration.Modules.AbpEfCore().AddDbContext<MyDbContext>(options =>
{options.DbContextOptions.UseSqlServer(options.ConnectionString);
});

public class MyEfCoreAppModule : AbpModule
{public override void PreInitialize(){Configuration.DefaultNameOrConnectionString = GetConnectionString("Default");...}
}

public class PersonAppService : IPersonAppService
{private readonly IRepository<Person> _personRepository;public PersonAppService(IRepository<Person> personRepository){_personRepository = personRepository;}public void CreatePerson(CreatePersonInput input){        person = new Person { Name = input.Name, EmailAddress = input.EmailAddress };_personRepository.Insert(person);}
}

//Base class for all repositories in my application
public class SimpleTaskSystemRepositoryBase<TEntity, TPrimaryKey> : EfCoreRepositoryBase<SimpleTaskSystemDbContext, TEntity, TPrimaryKey>where TEntity : class, IEntity<TPrimaryKey>
{public SimpleTaskSystemRepositoryBase(IDbContextProvider<SimpleTaskSystemDbContext> dbContextProvider): base(dbContextProvider){}//add common methods for all repositories
}//A shortcut for entities those have integer Id
public class SimpleTaskSystemRepositoryBase<TEntity> : SimpleTaskSystemRepositoryBase<TEntity, int>where TEntity : class, IEntity<int>
{public SimpleTaskSystemRepositoryBase(IDbContextProvider<SimpleTaskSystemDbContext> dbContextProvider): base(dbContextProvider){}//do not add any method here, add to the class above (because this class inherits it)
}

[AutoRepositoryTypes(typeof(IRepository<>),typeof(IRepository<,>),typeof(SimpleTaskSystemEfRepositoryBase<>),typeof(SimpleTaskSystemEfRepositoryBase<,>)
)]
public class SimpleTaskSystemDbContext : AbpDbContext
{...
}

public interface ITaskRepository : IRepository<Task, long>
{List<Task> GetAllWithPeople(int? assignedPersonId, TaskState? state);
}public class TaskRepository : SimpleTaskSystemRepositoryBase<Task, long>, ITaskRepository
{public TaskRepository(IDbContextProvider<SimpleTaskSystemDbContext> dbContextProvider): base(dbContextProvider){}public List<Task> GetAllWithPeople(int? assignedPersonId, TaskState? state){var query = GetAll();if (assignedPersonId.HasValue){query = query.Where(task => task.AssignedPerson.Id == assignedPersonId.Value);}if (state.HasValue){query = query.Where(task => task.State == state);}return query.OrderByDescending(task => task.CreationTime).Include(task => task.AssignedPerson).ToList();}
}

Configuration.ReplaceService<IRepository<Task, Guid>>(() =>
{IocManager.IocContainer.Register(Component.For<IRepository<Task, Guid>, ITaskRepository, TaskRepository>().ImplementedBy<TaskRepository>().LifestyleTransient());
});