图1.使用DataList显示主从表明细 
图2.使用Gridview显示主从表明细
 
数据库为SQL Server实例数据库Northwind,实现按照订单编号,统计显示出订单详情。
          一构建Northwind库中Orders订单表以及Order Details订单详细表在DataSet中的表关系:
InBlock.gif public class DataAccess
{
    public DataSet Tablerelation()
InBlock.gif        {
InBlock.gif                 string strCon = ConfigurationManager.ConnectionStrings[ "NorthwindConnectionString"].ConnectionString;
InBlock.gif                
InBlock.gif                 //构建连接
InBlock.gif                SqlConnection con = new SqlConnection(strCon);
InBlock.gif            
InBlock.gif                 //多个表来源于相同数据库我们可以讲sql语句一起书写,但需要注意的是,必须在语句间用空格隔开
InBlock.gif                SqlDataAdapter da = new SqlDataAdapter( "select    * from orders    select * from [order details]",con);
InBlock.gif                DataSet ds = new DataSet();
InBlock.gif                da.Fill(ds);
InBlock.gif
InBlock.gif                 //我们也可以修改默认生成的(Table、Table1、……)表名
InBlock.gif                ds.Tables [0].TableName= "orders";
InBlock.gif                ds.Tables[1].TableName = "orderDetails";
InBlock.gif
InBlock.gif                 //找到两个表中相关联的列
InBlock.gif                DataColumn father = ds.Tables[ "orders"].Columns[ "OrderID"];
InBlock.gif                DataColumn son = ds.Tables[ "orderDetails"].Columns[ "OrderID"];
InBlock.gif
InBlock.gif                 //给两个列,建立名为tablerelation的关系
InBlock.gif                DataRelation r = new DataRelation( "tablerelation", father, son);
InBlock.gif
InBlock.gif                 //将表关系添加到数据集中
InBlock.gif                ds.Relations.Add(r);
InBlock.gif                 return ds;
InBlock.gif        }
}
wef.config中的连接字符串为:
InBlock.gif<connectionStrings>
InBlock.gif  <add name= "NorthwindConnectionString" connectionString= "Data Source=.;Initial Catalog=Northwind;Integrated Security=True" providerName= "System.Data.SqlClient"/>
InBlock.gif  </connectionStrings>
接下来我们来布置控件的界面:
一DataList:
    给DataList1的项中添加一个一行二列的表,第一个单元格中绑定订单编号,第二个单元格中再加入一个DataList2作为此订单编号的订单详细,在DataList2的项中添加一个一行四列的表,单元格中绑定订单详细表中的字段名。给DataList1的头模版中加入一个一行五列的表,分别写入图片所示的列说明,布局源码如下:
InBlock.gif    <asp:DataList ID= "DataList1" runat= "server" BackColor= "White"    
InBlock.gif                        BorderColor= "#CCCCCC" BorderStyle= "None" BorderWidth= "1px" CellPadding= "3"    
InBlock.gif                        GridLines= "Both">
InBlock.gif                        <ItemStyle ForeColor= "#000066" />
InBlock.gif                        <SelectedItemStyle BackColor= "#669999" Font-Bold= "True" ForeColor= "White" />
InBlock.gif                        <HeaderTemplate>
InBlock.gif                                <table class= "style1" >
InBlock.gif                                        <tr>
InBlock.gif                                                <td width= "70">
InBlock.gif                                                        订单编号</td>
InBlock.gif                                                <td width= "70">
InBlock.gif                                                        商品编号</td>
InBlock.gif                                                <td width= "70">
InBlock.gif                                                        单价</td>
InBlock.gif                                                <td width= "70">
InBlock.gif                                                        数量</td>
InBlock.gif                                                <td width= "70">
InBlock.gif                                                        折扣</td>
InBlock.gif                                        </tr>
InBlock.gif                                </table>
InBlock.gif                        </HeaderTemplate>
InBlock.gif                        <FooterStyle BackColor= "White" ForeColor= "#000066" />
InBlock.gif                        <ItemTemplate>
InBlock.gif                                <table class= "style1">
InBlock.gif                                        <tr>
InBlock.gif                                                <td width= "70">
InBlock.gif                                                        <%#Eval( "OrderID") %></td>
InBlock.gif                                                <td>
InBlock.gif                                                        <asp:DataList ID= "DataList2" runat= "server"    
InBlock.gif                                                                 DataSource ='<%# ((System.Data.DataRowView)Container.DataItem).CreateChildView("tablerelation") %>'    
InBlock.gif                                                                Width = "100%" BackColor= "White" BorderColor= "#CC9966" BorderStyle= "None"    
InBlock.gif                                                                BorderWidth= "1px" CellPadding= "4" GridLines= "Both">
InBlock.gif                                                                <FooterStyle BackColor= "#FFFFCC" ForeColor= "#330099" />
InBlock.gif                                                                <ItemTemplate>
InBlock.gif                                                                        <table class= "style1">
InBlock.gif                                                                                <tr>
InBlock.gif                                                                                        <td width= "70">
InBlock.gif                                                                                             <%#Eval( "productID") %></td>
InBlock.gif                                                                                        <td width= "70">
InBlock.gif                                                                                             <%#Eval( "Unitprice") %></td>
InBlock.gif                                                                                        <td width= "70">
InBlock.gif                                                                                                 <%#Eval( "Quantity") %></td>
InBlock.gif                                                                                        <td width= "70">
InBlock.gif                                                                                             <%#Eval( "Discount") %></td>
InBlock.gif                                                                                </tr>
InBlock.gif                                                                        </table>
InBlock.gif                                                                </ItemTemplate>
InBlock.gif                                                                <ItemStyle BackColor= "White" ForeColor= "#330099" />
InBlock.gif                                                                <SelectedItemStyle BackColor= "#CC3333" Font-Bold= "True" ForeColor= "White" />
InBlock.gif                                                                <HeaderStyle BackColor= "#990000" Font-Bold= "True" ForeColor= "#FFFFCC" />
InBlock.gif                                                        </asp:DataList>
InBlock.gif                                                </td>
InBlock.gif                                        </tr>
InBlock.gif                                </table>
InBlock.gif                        </ItemTemplate>
InBlock.gif                        <HeaderStyle BackColor= "#006699" Font-Bold= "True" ForeColor= "White" />
InBlock.gif                </asp:DataList>
    其中用×××背景加粗显示的为DataList2的数据源将是根据该项中的订单编号,在表关系名“tablerelation”中找到对应的订单详情,创建一个视图。
     DataList1的数据源将绑定我们以及构建好的DataSet,代码如下:
InBlock.gif     protected void Page_Load( object sender, EventArgs e)
InBlock.gif        {
InBlock.gif                 if (!IsPostBack)
InBlock.gif                {
InBlock.gif                    
InBlock.gif                        Bind();
InBlock.gif                }
InBlock.gif        }
InBlock.gif         //绑定控件显示
InBlock.gif         void Bind()
InBlock.gif        {
InBlock.gif                DataAccess da = new DataAccess();
InBlock.gif                DataSet ds = da.Tablerelation();
InBlock.gif                DataList1.DataSource = ds.Tables[0];
InBlock.gif                DataList1.DataBind();
InBlock.gif
InBlock.gif                GridView2.DataSource = ds.Tables[0];
InBlock.gif                GridView2.DataBind();
InBlock.gif        }
二、使用Gridview的方式类似,首先将Gridview2的自动生成列AutoGenerateColumns="False"改为false,然后在Gridview2手动加入自定义项TemplateField中编辑模版,加入二行一列的表格,第一行绑定订单编号,第二行加入Gridview3,用于显示订单明细,自动生成列AutoGenerateColumns="False"改为false,加入自定义绑定的四个项目,如 <asp:BoundField DataField="productID" HeaderText="商品编号" />,源码如下:
InBlock.gif <asp:GridView ID= "GridView2" runat= "server" AutoGenerateColumns= "False"    
InBlock.gif                        CellPadding= "4" ForeColor= "#333333" GridLines= "None" >
InBlock.gif                        <FooterStyle BackColor= "#5D7B9D" Font-Bold= "True" ForeColor= "White" />
InBlock.gif                        <RowStyle BackColor= "#F7F6F3" ForeColor= "#333333" />
InBlock.gif                        <Columns>
InBlock.gif                                <asp:TemplateField>
InBlock.gif                                        <ItemTemplate>
InBlock.gif                                                <table class= "style1">
InBlock.gif                                                        <tr>
InBlock.gif                                                                <td>
InBlock.gif                                                                     订单编号:    <%#Eval( "OrderID") %></td>
InBlock.gif                                                        </tr>
InBlock.gif                                                        <tr>
InBlock.gif                                                                <td>
InBlock.gif                                                                         <asp:GridView ID="GridView3" runat="server"     DataSource ='<%# ((System.Data.DataRowView)Container.DataItem).CreateChildView("order") %>' DataMember= "orderID" AutoGenerateColumns= "False">
InBlock.gif                                                                         <Columns>
InBlock.gif                                                                            
InBlock.gif                                                                                <asp:BoundField DataField= "productID" HeaderText= "商品编号" />
InBlock.gif                                                                                                <asp:BoundField DataField= "Unitprice" HeaderText= "商品单价" />
InBlock.gif                                                                                                <asp:BoundField DataField= "Quantity" HeaderText= "商品数量" />
InBlock.gif                                                                                                <asp:BoundField DataField= "Discount" HeaderText= "折扣" />
InBlock.gif                                                                                
InBlock.gif                                                                                </Columns>
InBlock.gif                                                                                
InBlock.gif                                                                        </asp:GridView>
InBlock.gif                                                                        
InBlock.gif                                                                </td>
InBlock.gif                                                        </tr>
InBlock.gif                                                </table>
InBlock.gif                                        </ItemTemplate>
InBlock.gif                                </asp:TemplateField>
InBlock.gif                        </Columns>
InBlock.gif                        <PagerStyle BackColor= "#284775" ForeColor= "White" HorizontalAlign= "Center" />
InBlock.gif                        <SelectedRowStyle BackColor= "#E2DED6" Font-Bold= "True" ForeColor= "#333333" />
InBlock.gif                        <HeaderStyle BackColor= "#5D7B9D" Font-Bold= "True" ForeColor= "White" />
InBlock.gif                        <EditRowStyle BackColor= "#999999" />
InBlock.gif                        <AlternatingRowStyle BackColor= "White" ForeColor= "#284775" />
InBlock.gif                </asp:GridView>
Gridview3的数据源的绑定方式如上原理。