public override bool Equals(object obj)
{
bool result = false;
ExternalCatalogBook book = obj as ExternalCatalogBook;
if (book != null && (Id.Equals(book.Id) || Equals(book)))
{
result = true;
}
return(result);
}
private bool Equals(ExternalCatalogBook book)
{
bool equals = Title.Equals(book.Title);
equals &= HasAuthor() && book.HasAuthor() || !HasAuthor() && !book.HasAuthor();
equals &= HasKeywords() && book.HasKeywords() || !HasKeywords() && !book.HasKeywords();
if (equals && HasAuthor())
{
equals &= Author.Equals(book.Author);
}
if (equals && HasKeywords())
{
equals &= Keywords.Equals(book.Keywords);
}
return(equals);
}