嵌套的DataGrid如何为子DataGrid动态增加模板列

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>

</HEAD>

<body>

<asp:datagrid id="DataGrid1" runat="server" AutoGenerateColumns="False" PageSize="2" AllowPaging="True">

<asp:TemplateColumn HeaderText="分类名">

<%# 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);

}


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