public AddNoteViewModel()
{
AddNoteCommand = new Command(arg=> CreateNoteMethod());
BooksModel = ((App) (Application.Current)).BooksModel; // Модель данных
}
public AddBookViewModel()
{
AddBookCommand = new Command(arg=> CreateBookMethod());
ChoosePathCommand = new Command(arg => ChoosePathMethod());
BooksModel = ((App) (Application.Current)).BooksModel; // Модель данных
}