嵌套的DataGrid如何为子DataGrid动态增加模板列
来源：岁月联盟
时间：2005-05-19
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); } } 
}
