private static void TestDeepCopy()
{
Console.WriteLine("Cloning works:");
DeepPaper oxNews = new DeepPaper("Ox News");
oxNews.Insert(new NewsArticle("Corona stops production", "The beer manufacturer...", "Bill. D. Newsly"));
DeepPaper fakeNews = oxNews.Clone() as DeepPaper;
Console.WriteLine(oxNews);
Console.WriteLine(fakeNews);
Console.ForegroundColor = ConsoleColor.Cyan;
Console.WriteLine("\nAdding a new article in the original - does not change the copy:");
oxNews.Insert(new NewsArticle("Man bites dog", "Yesterday afternoon...", "Martha M. Newsworthy"));
Console.WriteLine(oxNews);
Console.WriteLine(fakeNews);
Console.ForegroundColor = ConsoleColor.Magenta;
Console.WriteLine("\nEven changing something in an article in the original - does not change the copy:");
oxNews.ChangeTitle(0, "New title");
Console.WriteLine(oxNews);
Console.WriteLine(fakeNews);
Console.ResetColor();
}
public DeepPaper(DeepPaper paper)
{
name = paper.name;
articles = new List <NewsArticle>();
foreach (var article in paper.articles)
{
// The list holds the references - you can not just
// copy that reference and add it to the other list,
// as it would point to the same object
articles.Add(new NewsArticle(article));
}
// Shorter way of doing it:
// articles = paper.articles.ConvertAll(article => new NewsArticle(article));
// Or with linq:
// articles = paper.articles.Select(article => new NewsArticle(article)).ToList();
}
