[置顶] Datalist嵌套datalist，页面传值，加密，数据绑定

 <asp:DataList ID="dlMajor" runat="server" CssClass="dllist" OnItemDataBound="dlMajor_ItemDataBound">
            <ItemTemplate>
                <div class="div_major">
                    <%#Eval("major_name")%>
                    <asp:HiddenField ID="hf_major" runat="server" Value='<%#Eval("major_url") %>'></asp:HiddenField>
                </div>
                <asp:DataList ID="dlClass" runat="server" CssClass="dllist" OnItemDataBound="dlClass_ItemDataBound">
                    <ItemTemplate>
                        <div class="div_class">
                            <%#Eval("class_name")%>
                            <asp:HiddenField ID="hf_class" runat="server" Value='<%#Eval("class_url") %>'></asp:HiddenField>
                        </div>
                        <ul>
                            <asp:DataList ID="dlStudent" runat="server" CssClass="dllist" OnItemDataBound="dlClass_ItemDataBound">
                                <ItemTemplate>
                                    <li>
                                        <div class="num left">
                                            <%#Eval("id")%>、</div>
                                    
                                            <%#new checkFiles.common.utils().GetInfo(Eval("student_url").ToString())%>
                                        </div>
                                    </li>
                                </ItemTemplate>
                            </asp:DataList>
                        </ul>
                    </ItemTemplate>
                </asp:DataList>
            </ItemTemplate>
            <FooterTemplate>
                <%--    <%if(dlMajor.Items.Count<=0) %>--%>
            </FooterTemplate>
        </asp:DataList>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using checkFiles.common;

namespace checkFiles
{
    public partial class center : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            string path = "";
            if (Request.QueryString["path"] != null && Request.QueryString["path"].ToString().Trim().Length > 0)
            {

                path = Server.HtmlDecode((Request.QueryString["path"].ToString().Trim()));
                
            }
          
            if (!IsPostBack)
            {
                utils util = new utils();
                dlMajor.DataSource = util.GetMajorName(path);
                dlMajor.DataBind();
                if (dlMajor.Items.Count <= 0)
                {
                    this.Panel1.Visible = true;
                }
                else
                {
                    this.Panel1.Visible = false;

                }
            }

        }
        protected void dlMajor_ItemDataBound(object sender, DataListItemEventArgs e)
        {

            utils util = new utils();

            HiddenField hf_major = (HiddenField)e.Item.FindControl("hf_major");
            if (hf_major != null)
            {

                string path = hf_major.Value.ToString();
                if (e.Item.ItemType == ListItemType.EditItem || e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
                {
                    DataList dlClass = (DataList)e.Item.FindControl("dlClass");
                    dlClass.DataSource = util.GetClassName(path);
                    dlClass.DataBind();
                }
              
            } 
        }
        protected void dlClass_ItemDataBound(object sender, DataListItemEventArgs e)
        {

            utils util = new utils();

            HiddenField hf_class = (HiddenField)e.Item.FindControl("hf_class");
            if (hf_class != null)
            {

                string path = hf_class.Value.ToString();
                if (e.Item.ItemType == ListItemType.EditItem || e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
                {
                    DataList dlStudent = (DataList)e.Item.FindControl("dlStudent");
                    dlStudent.DataSource = util.GetStudentName(path);
                    dlStudent.DataBind();
                }
            }
        }
    }
}