一种新的嵌套绑定的方法

以前做嵌套，要么是在多次访问数据库，要么是把数据取出来，然后分别使用DataView的RowFilter来做，今天发现了一种新的方法，使用DataSet的Relations可以很方便的做嵌套

方法主要是在dataset的表之间建立关联，然后在前台html视图里使用

DataSource=' <% # ((DataRowView)Container.DataItem).Row.GetChildRows("MyRelation")  %> '

具体例子如下：
这里用的是两个repeater嵌套

绑定代码：

Business.Customer obj  =   new  Zeda.CRM.Business.Customer();
            DataSet ds  =  obj.up_CRM_ProductSearchList( this .KeyWord);
            ds.Relations.Add( " MyRelation " ,ds.Tables[ 0 ].Columns[ " CustomerId " ],ds.Tables[ 1 ].Columns[ " CustomerId " ]);

            ParentRep.DataSource  =  ds.Tables[ 0 ].DefaultView;
             // ParentRep.DataBind();
            AspNetPager1.RecordCount  =  ds.Tables[ 0 ].Rows.Count;
            Page.DataBind();
            ds.Dispose();
            obj.Dispose();

html视图代码

 

< asp:repeater  id ="ParentRep"  Runat ="server" >
                                             < ItemTemplate >
                                                 < tr >
                                                     < td  height =25  width =40% > &nbsp;&nbsp;&nbsp;&nbsp; < a  href ='CustomerDetail.aspx?CustomerId=<%#  DataBinder.Eval(Container.DataItem,"CustomerId")% > '> <% # DataBinder.Eval(Container.DataItem,"Name") %> </ a ></ td >
                                                     < td >< asp:Repeater  ID =sonRep  Runat =server  DataSource ='<%#  ((DataRowView)Container.DataItem).Row.GetChildRows("MyRelation") % > '>
                                                             < ItemTemplate >
                                                                 < a  href ='ProductDetail.aspx?ProductId=<%#  DataBinder.Eval(Container.DataItem,"[ProductId]")% > '> <% # DataBinder.Eval(Container.DataItem, "[\"ProductName\"]") %> </ a >
                                                             </ ItemTemplate >
                                                             < SeparatorTemplate >
                                                                 &nbsp;&nbsp;
                                                             </ SeparatorTemplate >
                                                         </ asp:Repeater ></ td >
                                                 </ tr >
                                             </ ItemTemplate >
                                             < SeparatorTemplate >
                                                 < tr >
                                                     < td  height ="1"  background ="../images/xian01.gif"  colspan ="2" ></ td >
                                                 </ tr >
                                             </ SeparatorTemplate >
                                         </ asp:repeater >