使用 ExpanderView 控件动态递归呈现内容

    public partial class ViewComments_ExpanderPage : PhoneApplicationPage
    {
        ResourceDictionary dic = Application.Current.Resources;
        CallbackCommentData ccd;
        public ViewComments_ExpanderPage()
        {
            InitializeComponent();
            this.Loaded += new RoutedEventHandler(ViewComments_ExpanderPage_Loaded);
        }

        void ViewComments_ExpanderPage_Loaded(object sender, RoutedEventArgs e)
        {
            ccd = new CallbackCommentData();
            ccd.OpenCompleted += new EventHandler(ccd_OpenCompleted);
            ccd.Open();
        }

        void ccd_OpenCompleted(object sender, EventArgs e)
        {
            DownloadStringCompletedEventArgs even = e as DownloadStringCompletedEventArgs;
            if (even.Error != null)
                throw new Exception(even.Error.ToString());

            foreach (Comment comment in ccd.comments)
            {
                ExpanderView ev = CreateExpanderView(comment);
                stackPanel.Children.Add(ev);
            }

        }

        ExpanderView CreateExpanderView(Comment comment)
        {

            ExpanderView expander = new ExpanderView { IsExpanded = true };
            //{
            //    FontSize = (double)dic["PhoneFontSizeExtraLarge"],
            //    Foreground = (SolidColorBrush)dic["PhoneForegroundBrush"],
            //    FontFamily = (FontFamily)dic["PhoneFontFamilySemiLight"],
            //    Padding = new Thickness(0, 10, 0, 10),
            //     IsExpanded = true  
            //};
            //expander.HeaderTemplate.SetValue(HeaderedItemsControl.HeaderTemplateProperty,CreateDataTemplate(comment.content));
            //expander.HeaderTemplate = (DataTemplate)CreateDataTemplate(comment.content);
            expander.Header = CreateDataTemplate(comment);//comment.content;

            //if (comment != null && comment.children != null)
            //    expander.Items.Add(CreateItem(comment.children));
            if (comment.children != null && comment.children.Count > 0)
            {
                foreach (var item in comment.children)
                {
                    expander.Items.Add(CreateExpanderView(item));
                }
            }
            return expander;
        }

        StackPanel CreateDataTemplate(Comment comment)
        {
            //DataTemplate dataTemplate = new DataTemplate();
            StackPanel stackPanel = new StackPanel
            {
                Orientation = System.Windows.Controls.Orientation.Vertical
            };
            TextBlock textBlock = new TextBlock
            {
                Text = comment.content,
                Foreground = (SolidColorBrush)dic["PhoneForegroundBrush"],
                FontSize = 25,
                FontFamily = (FontFamily)dic["PhoneFontFamilySemiLight"],
                TextWrapping = TextWrapping.Wrap
            };
            
            TextBlock textBlock2 = new TextBlock
            {
                Text = comment.user.nick,
                Foreground = new SolidColorBrush(Colors.Magenta),//(SolidColorBrush)dic["PhoneForegroundBrush"],
                FontSize = 20,
                FontFamily = (FontFamily)dic["PhoneFontFamilySemiLight"],
                TextWrapping = TextWrapping.Wrap
            };
            stackPanel.Children.Add(textBlock2);
            stackPanel.Children.Add(textBlock);
            //dataTemplate.SetValue(HeaderedItemsControl.HeaderTemplateProperty, textBlock); //给 ExpanderView.TemplateProperty 赋值
            return stackPanel;
        }

        StackPanel CreateItem(List<Comment> comments)
        {
            //ItemCollection itemCollection = new ItemCollection();
            StackPanel stackPanel = new StackPanel();
            foreach (Comment item in comments)
            {
                //TextBlock textblock1 = new TextBlock
                //{
                //    Text = item.content,
                //    Margin = new Thickness(0, 8, 0, -4),
                //    Foreground = (SolidColorBrush)dic["PhoneForegroundBrush"],
                //    FontSize = (double)dic["PhoneFontSizeExtraLarge"],
                //    FontFamily = (FontFamily)dic["PhoneFontFamilySemiLight"]
                //};
                //stackPanel.Children.Add(textblock1);

                TextBlock textblock2 = new TextBlock
                {
                    Text = item.jid,
                    TextWrapping = TextWrapping.Wrap,
                    Margin = new Thickness(0, 0, 0, -2),
                    Foreground = (SolidColorBrush)dic["PhoneAccentBrush"],
                    FontSize = (double)dic["PhoneFontSizeNormal"],
                    FontFamily = (FontFamily)dic["PhoneFontFamilyNormal"]
                };

                stackPanel.Children.Add(textblock2);
            }

            return stackPanel;
        }
    }

重点是：  expander.Header = CreateDataTemplate(comment);//comment.content;

Header 为 object 的类型，可以为其赋予任何类型的内容。s