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 >
         < 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();
        }

        Web 窗体设计器生成的代码#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); 
        } 
    } 
}