添加到LinkedList后的LinkedListNode不设置next和previous字段

我是c#新手，正在尝试使用LinkedList<T>

class News {
    private int Id { get; set; }
    private string Name { get; set; }
    public News (int id, string name) {
        Id = id;
        Name = name;
    }
    public string getName() {
        return Name;
    }
}
class Program {
    static void Main(string[] args) {
        var newsList = new LinkedList<LinkedListNode<News>>();
        newsList.AddLast(new LinkedListNode<News>(new News(1,"News first")));
        newsList.AddLast(new LinkedListNode<News>(new News(2, "News second")));
        newsList.AddLast(new LinkedListNode<News>(new News(3, "News third")));
    }
}

一旦上面的代码运行，我结束了newsList包含3个节点，其中node.Previous和node.Next都是null。我做错了什么?

========================================= 我的实际代码 =========================

public ActionResult NewsDetail(int id = 0)
        {
            var an = db.News
                .Select(n => new NewsView
                {
                    Id = n.Id,
                    Name = n.Name,
                    Description = n.Description,
                    IsTop = n.IsTop,
                    IsDraft = n.IsDraft,
                    Content = n.Content,
                    CaruselContentType = n.CaruselContentType,
                    CaruselFileContent = n.CaruselFileContent,
                    CaruselFileName = n.CaruselFileName,
                    CaruselFileSize = n.CaruselFileSize,
                    NewsPartViews = n.NewsParts
                    .Select(
                       np => new NewsPartView
                       {
                           Id = np.Id,
                           SortNumber = np.SortNumber,
                           IsDraft = np.IsDraft,
                           Content = np.Content,
                           NewsId = np.NewsId,
                           NewsPartImagesPosition = np.NewsPartImagesPosition,
                           ImagesCols = np.ImagesCols,
                           ImagesWidth = np.ImagesWidth,
                           ImagesHeight = np.ImagesHeight,
                           ImagesBorder = np.ImagesBorder,
                           ImagesClickEnlarge = np.ImagesClickEnlarge,
                           NewsPartImageViews = np.NewsPartImages
                           .Select(
                           npi => new NewsPartImageView
                           {
                               Id = npi.Id
                           }
                           )
                       }
                    )
                });

            var newslList = new LinkedList<NewsView>(an);


            return View(newslList.Find(newslList.First(view => view.Id == id)));
        }