Repeater嵌套,非常简单

前台代码:

        <asp:Repeater ID="Repeater1" runat="server" OnItemDataBound="Repeater1_OnItemDataBound">
            <ItemTemplate>
                <p>
                    <a href='test.aspx?Category=<%# Eval("Id") %>'><%# Eval("Id") %></a>
                </p>
                <asp:Repeater ID="Repeater2" runat="server">
                    <ItemTemplate>
                        <li><a href='<%# Eval("href") %>'>
                            <%# Eval("text")%></a></li>
                    </ItemTemplate>
                </asp:Repeater>
            </ItemTemplate>
        </asp:Repeater>

使用的类结构是这样的,Category类包含了一个Link类的集合

    public class Cateogory
    {
        public int Id { get; set; }
        public List<Link> Links { get; set; }
    }

    public class Link
    {
        public string href { get; set; }
        public string text { get; set; }
    }

为了演示,不从数据库读取,自己填充一些数据

        private static List<Cateogory> GetData()
        {
            List<Cateogory> categories = new List<Cateogory>();
            for (int i = 0; i < 5; i++)
            {
                Cateogory c = new Cateogory();
                c.Id = i;
                List<Link> lst = new List<Link>();
                for (int j = 0; j < 3; j++)
                {
                    Link l = new Link();
                    l.href = "test.aspx?Category=" + i + "&Id=" + j;
                    l.text = "Cateogory:" + i + ";Id:" + j;
                    lst.Add(l);
                }
                c.Links = lst;

                categories.Add(c);
            }
            return categories;
        }

Page_Load的时候绑定Repeater1

        protected void Page_Load(object sender, EventArgs e)
        {
            List<Cateogory> categories = GetData();

            Repeater1.DataSource = categories;
            Repeater1.DataBind();
        }

关键在这里了,Repeater1绑定的时候,方法里要获取子类的集合,如果是数据库,应该是获取Id,再从数据库中根据Id取数据列表.

        protected void Repeater1_OnItemDataBound(object sender, RepeaterItemEventArgs e)
        {
            if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
            {
                Repeater rpt = e.Item.FindControl("Repeater2") as Repeater;
                if (rpt != null)
                {
                    Cateogory category = e.Item.DataItem as Cateogory;
                    rpt.DataSource = category.Links;
                    rpt.DataBind();
                }
            }
        }

最后的效果如图: