list列表下嵌套多个list_datalist和select的区别

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aspx

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<%@ Page Language=“C#” AutoEventWireup=“true” CodeFile=“DataListNesting.aspx.cs” Inherits=“DataListNesting” %>
<!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>DataListNesting</title>
</head>
<body>
<form id=“form1” runat=“server”>
<div>
<asp:DataList ID=“DataList1” runat=“server” OnItemDataBound=“DataList1_ItemDataBound”>
<ItemTemplate>
<asp:Label ID=“Label1” runat=“server” Text=‘<%# Eval(“OrderID”) %>’></asp:Label>
<asp:Label ID=“Label2” runat=“server” Text=‘<%# Eval(“CustomerID”) %>’></asp:Label>
<asp:DataList ID=“DataList2” runat=“server”>
<ItemTemplate>
<asp:Label ID=“Label1” runat=“server” Text=‘<%# Eval(“ProductID”) %>’></asp:Label>
<asp:Label ID=“Label2” runat=“server” Text=‘<%# Eval(“UnitPrice”) %>’></asp:Label>
<asp:Label ID=“Label3” runat=“server” Text=‘<%# Eval(“Quantity”) %>’></asp:Label>
</ItemTemplate>
</asp:DataList>
</ItemTemplate>
</asp:DataList>
</div>
</form>
</body>
</html>

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="DataListNesting.aspx.cs" Inherits="DataListNesting" %>
<!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>DataListNesting</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:DataList ID="DataList1" runat="server" OnItemDataBound="DataList1_ItemDataBound">
    <ItemTemplate>
        <asp:Label ID="Label1" runat="server" Text='<%# Eval("OrderID") %>'></asp:Label>
        <asp:Label ID="Label2" runat="server" Text='<%# Eval("CustomerID") %>'></asp:Label>
        <asp:DataList ID="DataList2" runat="server">
            <ItemTemplate>
                <asp:Label ID="Label1" runat="server" Text='<%# Eval("ProductID") %>'></asp:Label>
                <asp:Label ID="Label2" runat="server" Text='<%# Eval("UnitPrice") %>'></asp:Label>
                <asp:Label ID="Label3" runat="server" Text='<%# Eval("Quantity") %>'></asp:Label>
            </ItemTemplate>
        </asp:DataList>
    </ItemTemplate>
</asp:DataList>
</div>
</form>
</body>
</html>

aspx.cs

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using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
public partial class DataListNesting : System.Web.UI.Page
{
private void BindList()
{
SqlConnection cn = new SqlConnection(@“server=./sqlexpress;uid=sa;pwd=;database=northwind”);
SqlDataAdapter da = new SqlDataAdapter(“select OrderID, CustomerID from Orders”, cn);
DataSet ds = new DataSet();
cn.Open();
da.Fill(ds);
cn.Close();
DataList1.DataSource = ds.Tables[0].DefaultView;
DataList1.DataKeyField = “orderID”;
DataList1.DataBind();
}
private void Page_Load(object sender, System.EventArgs e)
{
if (!IsPostBack)
{
BindList();
}
}
protected void DataList1_ItemDataBound(object sender, DataListItemEventArgs e)
{
DataList datalist2;
if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
{
datalist2 = e.Item.FindControl(“DataList2”) as DataList;
if (datalist2 != null)
{
SqlConnection cn = new SqlConnection(@“server=./sqlexpress;uid=sa;pwd=;database=northwind;”);
SqlDataAdapter da = new SqlDataAdapter(“select ProductID, UnitPrice, Quantity from [Order Details] where orderID = @orderID”, cn);
da.SelectCommand.Parameters.AddWithValue(“@orderID”, (e.Item.DataItem as DataRowView)[“orderID”]);
DataSet ds = new DataSet();
cn.Open();
da.Fill(ds);
cn.Close();
datalist2.DataSource = ds.Tables[0].DefaultView;
datalist2.DataBind();
}
}
}
}