相对于上一次的使用Relation的缺点: 1. 不能限制返回的纪录数;2. 邦定时不方便,甚至不能邦定上;3. 程序简单,但不容易理解。4. 可能对于三层以上的嵌套不容易实现。 这次给出的嵌套方案,使用的ItemDataBound事件进行嵌套,实现起来很方便,其容易理解。并且解决了以上四个问题。 以下是主要的代码: <asp:DataList ID="DList_Class" DataKeyField="NavigatorID" BackColor="#ffffff" BorderWidth="0px" CellPadding="1" ShowFooter="False" ShowHeader="False" runat="server" CellSpacing="20" HorizontalAlign="Justify" RepeatColumns="2" RepeatDirection="Horizontal" RepeatLayout="Table" > <itemstyle VerticalAlign=Top></itemstyle> <itemtemplate> <b><%# DataBinder.Eval(Container.DataItem,"NavigatorID") %> @ <%# DataBinder.Eval(Container.DataItem,"NodeCaption") %></b> <hr> <asp:DataGrid ID=DG_SubClass Width=315px Runat=server AutoGenerateColumns="false" ShowHeader="false" ShowFooter="false" PageSize="10" AllowPaging="true" PagerStyle-Visible="false" BorderWidth="1" BackColor="#ffffff" BorderColor="#ffffff" CellPadding="0" CellSpacing="0" GridLines=Horizontal OnItemDataBound='DG_SubClass_ItemDataBound'> <ItemStyle Height="14px" BackColor="#e3f1ff" CssClass="gridHover"></ItemStyle> <Columns> <asp:BoundColumn DataField ="ModuleType" ReadOnly=True > <ItemStyle Width=25 HorizontalAlign=Center ></ItemStyle> </asp:BoundColumn> <asp:BoundColumn DataField="NodeCaption" > <ItemStyle HorizontalAlign=Left CssClass="nav"></ItemStyle> </asp:BoundColumn> <asp:BoundColumn DataField ="ModuleType" ReadOnly=True> <ItemStyle Width=90 HorizontalAlign=Center></ItemStyle> </asp:BoundColumn> </Columns> </asp:DataGrid> </itemtemplate> </asp:DataList> private void DList_Class_ItemDataBound(object sender, System.Web.UI.WebControls.DataListItemEventArgs e) { if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem) { DataGrid dg=(DataGrid)e.Item.FindControl("DG_SubClass"); string itemIndex =this.DList_Class.DataKeys[e.Item.ItemIndex].ToString(); string[] strSqlArray =new string[3]{"select Top 10 IOrder, ILevel, IParentID, NavigatorID, NodeCaption,ModuleID, ModuleType from NavigatorNodes where IParentID in ( ", itemIndex, ");"}; string strSql=string.Concat(strSqlArray); string TableName ="SubClass"+itemIndex; this.dbClass.AdapterFill(ds, CommandType.Text, strSql, TableName, new OleDbParameter[0]); dg.ItemDataBound += new System.Web.UI.WebControls.DataGridItemEventHandler(this.DG_SubClass_ItemDataBound); dg.DataSource =ds.Tables[TableName].DefaultView; dg.DataBind(); } } ==================== 更多内容,欢迎访问ms.mblogger.cn/nono 
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