private ICommand CreateBuyBookCommand(PurchaseBookService purchaseService,
IWishListRepository wishListRepository,
IMessageQueue messaging)
{
return(new Command(
execute: async() =>
{
IsBusy = true;
try
{
purchaseService.PurchaseAsync(m_book);
m_bookViewModel.PurchasedCount += 1;
await wishListRepository.RemoveAsync(m_book);
ChangeCanCommandExecute(PurchaseBook);
UpdateCanBookBeAddedToWishList(m_book);
messaging.Send(this, BookPurchased, m_book);
}
catch (Exception ex)
{
m_messaging.Send(this, ex);
}
IsBusy = false;
}, canExecute: () =>
{
return Book != null && purchaseService.IsMoneyEnoughForPurchase(m_book);
}));
}
public PurchaseBookViewModel(IBookRepository bookRepository,
IReviewRepository reviewRepository,
IMessageQueue messaging,
IWishListRepository wishListRepository,
WriteReviewViewModel newReview,
PurchaseBookService purchaseService)
{
m_booksRepository = bookRepository;
m_reviewRepository = reviewRepository;
m_wishListRepository = wishListRepository;
m_purchaseService = purchaseService;
m_messaging = messaging;
NewReview = newReview;
Reviews = new ObservableRangeCollection <Review>();
PurchaseBook = CreateBuyBookCommand(purchaseService, wishListRepository, messaging);
AddWishList = CreateAddWishListCommand(purchaseService, wishListRepository);
ShowBookCover = CreateShowBookCoverCommand(messaging);
SubmitNewReview = CreateSubmitNewReviewCommand(reviewRepository);
newReview.PropertyChanged += (sender, args) =>
{
ChangeCanCommandExecute(SubmitNewReview);
};
}
private ICommand CreateAddWishListCommand(PurchaseBookService purchaseService, IWishListRepository wishListRepository)
{
return(new Command(
execute: async() =>
{
IsBusy = true;
try
{
m_canAddToWishList = false;
ChangeCanCommandExecute(AddWishList);
await wishListRepository.AddAsync(m_book);
}
catch (Exception ex)
{
m_canAddToWishList = true;
ChangeCanCommandExecute(AddWishList);
m_messaging.Send(this, ex);
}
IsBusy = false;
}, canExecute: () =>
{
return m_canAddToWishList;
}));
}
