具有字符串和对象列表的嵌套中继器

我似乎不能弄清楚这组代码有什么问题。我有我的前端:

<asp:Repeater ID="ArchiveYearRepeater" runat="server" OnItemDataBound="ArchiveYearRepeater_ItemDataBound">
    <ItemTemplate>
        <div class="ArchiveYear">
            <h3><% DataBinder.Eval(Container.DataItem); %></h3>
            <ul>
                <asp:Repeater ID="ArchivePostRepeater" runat="server">
                    <ItemTemplate>
                        <li><a href="<% DataBinder.Eval(Container.DataItem, "URL"); %>"><% DataBinder.Eval(Container.DataItem, "Title"); %></a></li>
                    </ItemTemplate>
                </asp:Repeater>
            </ul>
        </div>
    </ItemTemplate>
</asp:Repeater>

后面是我的代码:

protected void Page_Load(object sender, EventArgs e)
        {

            ArchiveYearRepeater.DataSource = GetYears();
            ArchiveYearRepeater.DataBind();
        }
        protected List<ArchiveItem> GetArchiveItems()
        {
            List<ArchiveItem> ArchiveItems = new List<ArchiveItem>();
            List<BlogPost> posts = BlogPostManager.GetBlogPosts(0, BlogPostManager.BlogSection());
            foreach (BlogPost post in posts)
            {
                ArchiveItem archiveRecord = new ArchiveItem();
                archiveRecord.Title = post.Title;
                archiveRecord.Link = post.URL;
                archiveRecord.Date = post.Date;
                archiveRecord.Year = post.Date.ToString("yyyy");
                ArchiveItems.Add(archiveRecord);
            }
            return ArchiveItems;
        }
        protected List<string> GetYears()
        {
            List<string> Years = new List<string>();
            List<ArchiveItem> ArchiveItems = new List<ArchiveItem>();
            ArchiveItems = GetArchiveItems();
            foreach (ArchiveItem item in ArchiveItems)
            {
                if(!Years.Contains(item.Year)){
                    Years.Add(item.Year);
                }
            }
            return Years;
        }
        private void ArchiveYearRepeater_ItemDataBound(object sender,
    System.Web.UI.WebControls.RepeaterItemEventArgs e)
        {
            RepeaterItem item = e.Item;
            if ((item.ItemType == ListItemType.Item) ||
                (item.ItemType == ListItemType.AlternatingItem))
            {
                Repeater ArchivePostRepeater = new Repeater();
                ArchivePostRepeater = (Repeater)item.FindControl("ArchivePostRepeater");
                ArchivePostRepeater.DataSource = GetArchiveItems();
                ArchivePostRepeater.DataBind();
            }
        }

我试图使最外层的重复器重复在"BlogPost"的主数据集中发现的年份。然后，我试着把那一年的每一篇文章都写下来。我正在使用sharepoint，所以这个东西抛出错误，我似乎无法调试。