public TBookList(TBookList books) : this()
{
if (books == null)
{
return;
}
lock ( _LockItems ) {
Items = new List <TBook>(books);
}
}
public IEnumerable <TBook> GetMissingFrom(TBookList bookList)
{
lock ( _LockItems ) {
if (bookList == null)
{
yield break;
}
foreach (TBook BookItem in bookList)
{
if (Items.FirstOrDefault(x => x.CollectionName.ToLower() == BookItem.CollectionName.ToLower() && x.Number.ToLower() == BookItem.Number.ToLower() && x.Name.ToLower() == BookItem.Name.ToLower()) == null)
{
yield return(BookItem);
}
}
}
}