public CopyInfo(BookItem bookItem, int stock, double prize, string currency)
{
this.bookItem = bookItem;
this.stock = stock;
this.prize = prize;
this.currency = currency;
}
public int FindBookItem(string title, string author)
{
BookItem pattern = new BookItem(title, author);
int key = -1;
foreach (BookItem element in dataContext.books.Values)
{
if (element.Equals(pattern))
{
key = dataContext.books.FirstOrDefault(x => x.Value.Equals(pattern)).Key;
return(key);
}
}
return(key);
}
