How do I use multiple databases with Autofac? - asp.net-mvc

Question

I am having a project and my project is connecting to two different databases are BookStoreEntities and BlogEntities.
If I remove line code builder.RegisterType<BlogEntities>().As<DbContext>(); in Autofac configuration my project works fine and else I'll get error "The entity type Book is not part of the model for the current context".
My autofac config:
var builder = new ContainerBuilder();
builder.RegisterControllers(Assembly.GetExecutingAssembly());
builder.RegisterType<BookStoreEntities>().As<DbContext>();
builder.RegisterType<BlogEntities>().As<DbContext>();
builder.RegisterGeneric(typeof(Repository<>)).As(typeof(IRepository<>)).InstancePerDependency();
builder.RegisterType<BookService>().As<IBookService>();
builder.RegisterFilterProvider();
IContainer container = builder.Build();
DependencyResolver.SetResolver(new AutofacDependencyResolver(container));
Repository class:
public class Repository<T> : IRepository<T> where T : class
{
private DbContext _dbContext;
private DbSet<T> _dbSet;
public Repository(DbContext dbContext)
{
_dbContext = dbContext;
_dbSet = dbContext.Set<T>();
}
public IEnumerable<T> GetAll()
{
return _dbSet;
}
}
Service layer:
public class BookService : IBookService
{
private IRepository<Book> _bookRepository;
public BookService(IRepository<Book> bookRepository)
{
_bookRepository = bookRepository;
}
public IEnumerable<Book> GetBooks()
{
return _bookRepository.GetAll();
}
}
Controller:
public class BookController : Controller
{
private IBookService _bookService;
public BookController(IBookService bookService)
{
_bookService = bookService;
}
// GET: Book
public ActionResult Index()
{
var books = _bookService.GetBooks();
return View(books);
}
}

Answer 1

My Project is using 2 different databases and Service layer will implement from this Generic Repository. I want to myservice1 works with MyDbContext1 and myservice2 works with MyDbContext2
Then don't new your DbContext inside your repository. That makes testing hard anyway.
Inject it:
public Repository(DbContext dbContext)
{
_dbContext = dbContext;
}
Now the repository doesn't care which DbContext-derived class is injected. This works because you only call DbContext.Set<T>().

Answer 2

Try to something like:
public class MyDbContext1 : DbContext
{
public MyDbContext1 ()
:base("ConnectionString")
{ }
public new IDbSet<TEntity> Set<TEntity>() where TEntity : class
{
return base.Set<TEntity>();
}
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
//...
}
}
And add to repository new property
private IDbSet<T> Entities
{
get
{
if (_dbSet == null)
{
_dbSet = _dbContext1.Set<T>();
}
return _dbSet;
}
}