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>