在ItemsControl中加载更多项目时尝试向ItemsControl添加项目时出现OutOfMemoryException

Question

我有ItemsControl ScrollViewer它显示新馈送。 Answer为什么我不使用ListBox。我显示40-50个新闻，然后，我按下按钮，更新新闻源集合，然后 - 将其放入ItemsControl。但我有OutOfMemoryException，我可以理解为什么。我用来获取更多新闻源的方法与第一次加载数据的方法相同，所以我认为问题不在其中。但这是代码

        void c_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e)
    {
        XDocument xml = XDocument.Load(e.Result); 
        App.WriteToIsoStorage(xml.ToString(), "items.xml");
        App.New_From = (string)xml.Element("response").Element("new_from").Value;
        var inf = from c in xml.Descendants("item") 
                  select c;
        foreach (var item in inf)
        {
            if ((string)item.Element("type").Value != "friend" && item.Element("type").Value != "photo_tag" && (string)item.Element("type").Value != "photo" && item.Element("type").Value != "wall_photo")
            {
                New new1 = new New();
                GetIds(item, new1, out new1);
                GetIcons(item, new1, out new1);
                if (item.Element("attachment") != null)
                {
                    var vd = from c in item.Descendants("attachment")
                                select c;
                    foreach (var content in vd)
                    {
                        if (content.Element("audio") != null) GetAudios(content, new1.audioAttachments, out new1.audioAttachments);
                        if (content.Element("photo") != null && (string)item.Element("type").Value != "photo" && item.Element("type").Value != "wall_photo") GetPhotos(content, new1.photoAttachments, out new1.photoAttachments);
                        if (content.Element("video") != null) GetVideos(content, new1.videoAttachments, out new1.videoAttachments);
                        if (content.Element("link") != null) GetUrls(content, new1, out new1);
                    }
                }
                if (item.Element("type").Value != "photo" && item.Element("type").Value != "wall_photo" && item.Element("type").Value != "photo_tag")
                NewsList.Add(new1);
                this.ItemsControl.Items.Add(new1);
                new1 = null;
            }

            IEnumerable<XElement> profiles = from c in xml.Descendants("user") // 
                                                select c;
            IEnumerable<XElement> groups = from c in xml.Descendants("group") // 
                                                select c;
            GetNames(profiles, groups);


        }
    }

这里的VS显示