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例子比较简单，直接贴代码了，例子达到以下功能：
（1）两个datagrid嵌套
（2）外面一个datagrid分页
（3）里面一个datagrid动态增加模板列 
<%@ page language=“c#“ codebehind=“webform45.aspx.cs“ autoeventwireup=“false“ inherits=“csdn2.webform45“ %> 
<!doctype html public “-//w3c//dtd html 4.0 transitional//en” > <html> <head> <title>test</title> <meta content=”microsoft visual studio .net 7.1″ name=”generator”> <meta content=”c#” name=”code_language”> <meta content=”javascript” name=”vs_defaultclientscript”> <meta content=”http://schemas.microsoft.com/intellisense/ie5″ name=”vs_targetschema”> </head> <body> <form id=”form1″ method=”post” runat=”server”> <asp:datagrid id=”datagrid1″ runat=”server” autogeneratecolumns=”false” pagesize=”2″ allowpaging=”true”> <columns> <asp:templatecolumn headertext=”分类名”> <itemtemplate> <%# databinder.eval(container.dataitem, “classname“) %> <asp:datagrid id=”datagrid2″ runat=”server” autogeneratecolumns=”false”></asp:datagrid> </itemtemplate> </asp:templatecolumn> </columns> </asp:datagrid></form> </body> </html>
using system; using system.collections; using system.componentmodel; using system.data; using system.data.sqlclient; using system.drawing; using system.web; using system.web.sessionstate; using system.web.ui; using system.web.ui.webcontrols; using system.web.ui.htmlcontrols; namespace csdn2 { 
/// <summary> 
/// webform45 的摘要说明。 
/// </summary> public class webform45 : system.web.ui.page { protected system.web.ui.webcontrols.datagrid datagrid1; private void page_load(object sender, system.eventargs e) { // 在此处放置用户代码以初始化页面 if(!ispostback) { setbind(); } } private void setbind() { sqlconnection conn=new sqlconnection(system.configuration.configurationsettings.appsettings[“conn“]); sqldataadapter da=new sqldataadapter(“select * from class;select * from topic“,conn); dataset ds=new dataset(); da.fill(ds); ds.relations.add(“class_topic“,ds.tables[0].columns[“classid“],ds.tables[1].columns[“topicclassid“]); this.datagrid1.datasource=ds.tables[0]; this.datagrid1.databind(); } #region web 窗体设计器生成的代码 override protected void oninit(eventargs e) { // // codegen: 该调用是 asp.net web 窗体设计器所必需的。 // initializecomponent(); base.oninit(e); } /// <summary> /// 设计器支持所需的方法 – 不要使用代码编辑器修改 /// 此方法的内容。 /// </summary> private void initializecomponent() { this.datagrid1.pageindexchanged += new system.web.ui.webcontrols.datagridpagechangedeventhandler(this.datagrid1_pageindexchanged); this.datagrid1.itemdatabound += new system.web.ui.webcontrols.datagriditemeventhandler(this.datagrid1_itemdatabound); this.load += new system.eventhandler(this.page_load); } #endregion private void datagrid1_itemdatabound(object sender, system.web.ui.webcontrols.datagriditemeventargs e) { if(e.item.itemtype==listitemtype.item||e.item.itemtype==listitemtype.alternatingitem) { datagrid dgrd=(datagrid)e.item.findcontrol(“datagrid2“); dgrd.itemdatabound += new system.web.ui.webcontrols.datagriditemeventhandler(this.datagrid2_itemdatabound); templatecolumn tm=new templatecolumn(); tm.itemtemplate=new columntemplate(); tm.headertext=“主题名“; dgrd.columns.add(tm); dgrd.datasource=((datarowview)e.item.dataitem).row.getchildrows(“class_topic“); dgrd.databind(); } } private void datagrid1_pageindexchanged(object source, system.web.ui.webcontrols.datagridpagechangedeventargs e) { this.datagrid1.currentpageindex=e.newpageindex; setbind(); } private void datagrid2_itemdatabound(object sender, system.web.ui.webcontrols.datagriditemeventargs e) { if(e.item.itemtype==listitemtype.item||e.item.itemtype==listitemtype.alternatingitem) { ((label)e.item.findcontrol(“topicname“)).text=convert.tostring(databinder.eval(e.item.dataitem,“[\“topicname\“]“)); } } } public class columntemplate : itemplate { public void instantiatein(control container) { label l=new label(); l.id=“topicname“; container.controls.add(l); } } 
} 
