/// <summary>
/// Updates books.
/// </summary>
public virtual async void UpdateBooks()
{
ConnectionErrorOccured = false;
Loaded = false;
try
{
var books = await App.CurrentApplication.BookRequestManager.GetBooksByCategory(this.BooksCategory, 10, 0);
if (books != null)
{
foreach (Book book in books)
{
BookViewModel bookViewModel = new BookViewModel(book);
bookViewModel.CheckCoverExistence();
this.Books.Add(bookViewModel);
}
}
}
catch (WebException webEx)
{
ConnectionErrorOccured = true;
}
finally
{
Loaded = true;
}
}
protected override void OnNavigatedTo(System.Windows.Navigation.NavigationEventArgs e)
{
base.OnNavigatedTo(e);
if (isNewPageInstance)
{
if (ViewModel == null)
{
object viewModel = null;
if (State.TryGetValue(transientKey, out viewModel))
{
DataContext = viewModel;
}
else
{
DataContext = new BookViewModel(new Book());
}
}
else
{
ViewModel.UpdateBookDetails();
}
}
ViewModel.UpdateRating();
ViewModel.UpdateReviews();
if (e.NavigationMode == System.Windows.Navigation.NavigationMode.New)
{
ViewModel.AddToHistory();
DataContext = ViewModel;
}
isNewPageInstance = false;
}
/// <summary>
/// Loads more #number_of_results results. Method is called, when user reached last item in list.
/// </summary>
public virtual async void FetchMoreBooks()
{
var resultsCount = App.CurrentApplication.ResultsCount;
if (Books.Count % resultsCount == 0) // true, if it is possible to load more books
{
try
{
ConnectionErrorOccured = false;
Loaded = false;
var books = await App.CurrentApplication.BookRequestManager.SearchBooks(title, author, (uint)resultsCount, (uint)Books.Count);
if (books != null)
{
foreach (Book book in books)
{
BookViewModel bookViewModel = new BookViewModel(book);
bookViewModel.CheckCoverExistence();
this.Books.Add(bookViewModel);
}
}
}
catch (WebException webEx)
{
//App.CurrentApplication.MessageService.ShowErrorMessage("Server is down.", "Error");
ConnectionErrorOccured = true;
}
finally
{
Loaded = true;
}
}
}
