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我需要从此列表中获取数据,但是当我将我的 foreach 放入运行时错误时说该列表包含空对象。但是,如果我删除 foreach 并在 listbox.itemsSource 接收列表的行上放置一个断点,我会看到我已经正确加载了所有项目的列表。

  var imgs = e.Document.DocumentNode.SelectNodes(@"//img[@src]")
                    .Select(img => new 
                    {
                        Link = img.Attributes["src"].Value,
                        Title = img.Attributes["alt"].Value,         

                    }).ToList(); 
                listBoxPopular.ItemsSource = imgs;

                foreach (var item in imgs)
                {
                    listBoxPopular.Items.Add(new PopularVideos(item.Title, item.Link));
                }

班级:

class PopularVideos
    {
        public PopularVideos() { }
        public PopularVideos(string titulo, string url)
        {
            Titulo = titulo;            
            BitmapImage Img = new BitmapImage(new Uri(url));
        }

        public string Titulo { get; set; }

        public Uri Url { get; set; }
    }

错误是:

An unhandled exception of type 'System.NullReferenceException' occurred in AppUnno.dll

堆栈跟踪:

AppUnno.dll!AppUnno.MainPage.DownLoadCompleted(object sender, HtmlAgilityPack.HtmlDocumentLoadCompleted e) Line 58 + 0x6 bytes C#

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