/// <summary>
/// Searchs books by criteria.
/// </summary>
/// <param name="criteria">Object inherited from ICompareWithCriteria interface.</param>
/// <returns>List of Book objects selected by criteria.</returns>
public IEnumerable <Book> SearchElementByTag(ICompareWithCriteria <Book> criteria)
{
List <Book> selectedBooks = new List <Book>();
foreach (var book in storage)
{
if (criteria.Compare(book))
{
yield return(book);
}
}
}
public Book SearchFirstElementByTag(ICompareWithCriteria <Book> criteria)
{
List <Book> selectedBooks = new List <Book>();
foreach (var book in storage)
{
if (criteria.Compare(book))
{
return(book);
}
}
return(null);
}
