DataList嵌套绑定例子

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="DataList控件.aspx.cs" Inherits="WebApplication1.DataList控件" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>DataList嵌套绑定例子</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
      <asp:DataList ID="DataList1" runat="server" 
      RepeatColumns="2" RepeatDirection="Horizontal" OnItemDataBound="DataList1_ItemDataBound">
       <ItemTemplate>
        <div style="background-color:Green">
        <asp:Label ID="Label1" runat="server" Text='<%#Eval("Sex")%>' Visible="false"></asp:Label>
        <%#bool.Parse(Eval("Sex").ToString())==true?"男":"女" %>
        </div>
        <asp:DataList ID="DataList2" runat="server">
         <ItemTemplate>
          <%#Eval("RealName")%>
         </ItemTemplate>
        </asp:DataList>
       </ItemTemplate>
      </asp:DataList>
    </div>
    </form>
</body>
</html>

CS代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
using System.Data;

namespace WebApplication1
{
    public partial class DataList控件 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!Page.IsPostBack)
            {
                BindSex();
            }
        }
        //绑定顶级项目
        private void BindSex()
        {
            SqlConnection conn = new SqlConnection(@"server=Rose-PCSQLEXPRESS;Database=User;User Id=sa;password=");
            SqlCommand command = new SqlCommand("Select distinct Sex from UserInfo", conn);
            SqlDataAdapter adapter = new SqlDataAdapter(command);
            DataTable data = new DataTable();
            adapter.Fill(data);

            DataList1.DataSource = data;
            DataList1.DataBind();
        }
        //当绑定DataList1中的每一项时的处理方法
        protected void DataList1_ItemDataBound(object sender, DataListItemEventArgs e)
        {
          //如果要绑定的项是交替项或者是普通项
            if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
            {
                //e.Item表示当前绑定的那行
                //利用e.Item.FindControl（"Label1"）来找到那一行的id为“Label”的Label控件
                Label lbSex = (Label)(e.Item.FindControl("Label1"));
                //利用e.Item.FindControl（"DataList2"）来找到那一行的id为“DataList2”的DataList2控件
                DataList dl2 = (DataList)(e.Item.FindControl("DataList2"));

                bool male = bool.Parse(lbSex.Text);
                dl2.DataSource = GetDataTable(male);
                dl2.DataBind();
            }
        }

        private DataTable GetDataTable(bool male)
        {
            SqlConnection conn = new SqlConnection(@"server=Rose-PCSQLEXPRESS;Database=User;User Id=sa;password=");
            SqlCommand command = new SqlCommand("Select top 3 RealName from UserInfo where Sex=@Sex order by ID", conn);
            command.Parameters.AddWithValue("@Sex", male);
            SqlDataAdapter adapter = new SqlDataAdapter(command);
            DataTable data = new DataTable();
            adapter.Fill(data);
            return data;
        }
        
        
    }
}

注意：上面的代码使用了两个DataList控件，第二个位于itemTemplate模板里，用于绑定当前数据，在第一个itemTemplate里还用到一个Label控件，这个是不可见的（visible=“false”）这个不是为了显示数据，是为了保护第二个DataList控件要绑定显示数据的条件