(原创)DataGrid动态添加模板列的一个例子


数据源结构同
http://www.cnblogs.com/lovecherry/archive/2005/03/25/125525.html
表dep:depid(标识主键),depname(学院名字)
表stu:stuid(标识主键),stuname(学生名字),studepid(学院id=表dep.depid)

前台:
<%@ Page language="c#" Codebehind="WebForm30.aspx.cs" AutoEventWireup="false" Inherits="csdn.WebForm30" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
 <HEAD>
  <title>WebForm30</title>
  <meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1">
  <meta name="CODE_LANGUAGE" Content="C#">
  <meta name="vs_defaultClientScript" content="JavaScript">
  <link href="css.css" rel="stylesheet" type="text/css">
  <meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
 </HEAD>
 <body MS_POSITIONING="GridLayout">
  <form id="Form1" method="post" runat="server">
  </form>
 </body>
</HTML>
后台:
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 csdn
{
 /// <summary>
 /// WebForm30 的摘要说明。
 /// </summary>
 public class WebForm30 : System.Web.UI.Page
 {
  DataGrid DataGrid1=new DataGrid();
  private void Page_Load(object sender, System.EventArgs e)
  {
   // 在此处放置用户代码以初始化页面
   CreateDataGrid(); 
  }
  
  protected void CreateDataGrid()
  {
   DataGrid1.AutoGenerateColumns=false;
   DataGrid1.CssClass="border";
   DataGrid1.BorderWidth=0;
   DataGrid1.CellSpacing=1;
   DataGrid1.CellPadding=5;
   DataGrid1.ItemStyle.CssClass="item";
   DataGrid1.HeaderStyle.CssClass="header";
   DataGrid1.DataKeyField="stuid";
//以上设定DataGrid的样式
   TemplateColumn tm=new TemplateColumn();
   tm.ItemTemplate=new ColumnTemplate1();
   tm.HeaderText="姓名";
   DataGrid1.Columns.Add(tm);
//建立第一个模板列
   TemplateColumn tm2=new TemplateColumn();
   tm2.ItemTemplate=new ColumnTemplate2();
   tm2.HeaderText="学院";
   DataGrid1.Columns.Add(tm2);
//建立第二个模板列
   ButtonColumn bc=new ButtonColumn();
   bc.ButtonType=ButtonColumnType.PushButton;
   bc.CommandName="del";
   bc.Text="删除";
   DataGrid1.Columns.Add(bc);
//建立删除按钮列
   SetBind();
//填充数据
   Page.Controls[1].Controls.Add(DataGrid1);
//给页面的form加入这个DataGrid1
  }

  protected void SetBind()
  {
   SqlConnection conn=new SqlConnection(System.Configuration.ConfigurationSettings.AppSettings["conn"]);
   SqlDataAdapter da=new SqlDataAdapter("select * from stu,dep where stu.studepid=dep.depid",conn);
   DataSet ds=new DataSet();
   da.Fill(ds,"table1");
   this.DataGrid1.DataSource=ds.Tables["table1"];
   this.DataGrid1.DataBind();
   
  }

  private void DataGrid1_ItemDataBound(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)
  {
//和上面连接给出的例子中的代码一样,给下拉框绑定数据,并且选择默认的
   SqlConnection conn=new SqlConnection(System.Configuration.ConfigurationSettings.AppSettings["conn"]);
   SqlDataAdapter da=new SqlDataAdapter("select * from dep",conn);
   DataSet ds=new DataSet();
   da.Fill(ds,"table1");
   if(e.Item.ItemType==ListItemType.Item||e.Item.ItemType==ListItemType.AlternatingItem)
   {
    DropDownList ddl=(DropDownList)e.Item.FindControl("dep");
    ddl.DataSource=ds.Tables["table1"];
    ddl.DataTextField="depname";
    ddl.DataValueField="depid";
    ddl.DataBind();
    ddl.Items.FindByValue(Convert.ToString(DataBinder.Eval(e.Item.DataItem,"depid"))).Selected=true;
   }
  }

  private void DataGrid1_ItemCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
  {
   if(e.CommandName=="del")
   {
    SqlConnection conn=new SqlConnection(System.Configuration.ConfigurationSettings.AppSettings["conn"]);
    SqlCommand comm=new SqlCommand("delete from stu where stuid=@id",conn);
    SqlParameter parm1=new SqlParameter("@id",SqlDbType.Int);
    parm1.Value=this.DataGrid1.DataKeys[e.Item.ItemIndex];
    comm.Parameters.Add(parm1);
    conn.Open();
    comm.ExecuteNonQuery();
    conn.Close();
    SetBind();
   }
  }

  #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.Load += new System.EventHandler(this.Page_Load);
   this.DataGrid1.ItemDataBound += new System.Web.UI.WebControls.DataGridItemEventHandler(this.DataGrid1_ItemDataBound);
   this.DataGrid1.ItemCommand += new System.Web.UI.WebControls.DataGridCommandEventHandler(this.DataGrid1_ItemCommand);//这里的两个事件千万别忘记,因为DataGrid是后台创建的,这些事件需要自己来写上,vs.net也不会为你创建
  }
  #endregion
 }

 public class ColumnTemplate1 : ITemplate
 {
//第一个模板列
  public void InstantiateIn(Control container)      
  {
   LiteralControl l = new LiteralControl();
   l.DataBinding += new EventHandler(this.OnDataBinding);
//数据绑定
   container.Controls.Add(l);
//为模板列加入LiteralControl
  }

  public void OnDataBinding(object sender, EventArgs e)
  {
   LiteralControl l = (LiteralControl) sender;//LiteralControl发送绑定请求
   DataGridItem container = (DataGridItem) l.NamingContainer;
   l.Text = ((DataRowView)container.DataItem)["stuname"].ToString();//绑定stuname字段
  }
 }

 public class ColumnTemplate2 : ITemplate
 {
//第二个模板列
  public void InstantiateIn(Control container)      
  {
   DropDownList dpl = new DropDownList();
   dpl.ID="dep";
   container.Controls.Add(dpl);
//加入一个id="dep"的下拉框,数据在DataGrid的ItemDataBound中绑定
  }
 } 
}

posted @ 2005-03-25 13:19  lovecherry  阅读(26653)  评论(27编辑  收藏  举报