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<p class="style7"><SPAN class=style1>DataGrid动态添加模板列的一个例子</SPAN></p>
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发布时间：2005-3-28 被阅览数：<SCRIPT src="../../counter.asp?id=387"></SCRIPT> 次 作者：断剑
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<td width="100%"><p class="style6">数据源结构同http://blog.csdn.net/lovecherry/archive/2005/03/24/328455.aspx <BR>表dep：depid（标识主键），depname（学院名字） <BR>表stu：stuid（标识主键），stuname（学生名字），studepid（学院id＝表dep.depid） <BR><BR>前台： <BR><%@ Page language="c#" Codebehind="WebForm30.aspx.cs" AutoEventWireup="false" Inherits="csdn.WebForm30" %> <BR><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" > <BR><HTML> <BR><HEAD> <BR><title>WebForm30</title> <BR><meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1"> <BR><meta name="CODE_LANGUAGE" Content="C#"> <BR><meta name="vs_defaultClientScript" content="JavaScript"> <BR><link href="css.css" rel="stylesheet" type="text/css"> <BR><meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5"> <BR></HEAD> <BR><body MS_POSITIONING="GridLayout"> <BR><form id="Form1" method="post" runat="server"> <BR></form> <BR></body> <BR></HTML> <BR>后台： <BR>using System; <BR>using System.Collections; <BR>using System.ComponentModel; <BR>using System.Data; <BR>using System.Data.SqlClient; <BR>using System.Drawing; <BR>using System.Web; <BR>using System.Web.SessionState; <BR>using System.Web.UI; <BR>using System.Web.UI.WebControls; <BR>using System.Web.UI.HtmlControls; <BR><BR>namespace csdn <BR>{ <BR>/// <summary> <BR>/// WebForm30 的摘要说明。 <BR>/// </summary> <BR>public class WebForm30 : System.Web.UI.Page <BR>{ <BR>DataGrid DataGrid1=new DataGrid(); <BR>private void Page_Load(object sender, System.EventArgs e) <BR>{ <BR>// 在此处放置用户代码以初始化页面 <BR>CreateDataGrid(); <BR>} <BR><BR>protected void CreateDataGrid() <BR>{ <BR>DataGrid1.AutoGenerateColumns=false; <BR>DataGrid1.CssClass="border"; <BR>DataGrid1.BorderWidth=0; <BR>DataGrid1.CellSpacing=1; <BR>DataGrid1.CellPadding=5; <BR>DataGrid1.ItemStyle.CssClass="item"; <BR>DataGrid1.HeaderStyle.CssClass="header"; <BR>DataGrid1.DataKeyField="stuid"; <BR>//以上设定DataGrid的样式 <BR>TemplateColumn tm=new TemplateColumn(); <BR>tm.ItemTemplate=new ColumnTemplate1(); <BR>tm.HeaderText="姓名"; <BR>DataGrid1.Columns.Add(tm); <BR>//建立第一个模板列 <BR>TemplateColumn tm2=new TemplateColumn(); <BR>tm2.ItemTemplate=new ColumnTemplate2(); <BR>tm2.HeaderText="学院"; <BR>DataGrid1.Columns.Add(tm2); <BR>//建立第二个模板列 <BR>ButtonColumn bc=new ButtonColumn(); <BR>bc.ButtonType=ButtonColumnType.PushButton; <BR>bc.CommandName="del"; <BR>bc.Text="删除"; <BR>DataGrid1.Columns.Add(bc); <BR>//建立删除按钮列 <BR>SetBind(); <BR>//填充数据 <BR>Page.Controls[1].Controls.Add(DataGrid1); <BR>//给页面的form加入这个DataGrid1 <BR>} <BR><BR>protected void SetBind() <BR>{ <BR>SqlConnection conn=new SqlConnection(System.Configuration.ConfigurationSettings.AppSettings["conn"]); <BR>SqlDataAdapter da=new SqlDataAdapter("select * from stu,dep where stu.studepid=dep.depid",conn); <BR>DataSet ds=new DataSet(); <BR>da.Fill(ds,"table1"); <BR>this.DataGrid1.DataSource=ds.Tables["table1"]; <BR>this.DataGrid1.DataBind(); <BR><BR>} <BR><BR>private void DataGrid1_ItemDataBound(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e) <BR>{ <BR>//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 <BR>SqlConnection conn=new SqlConnection(System.Configuration.ConfigurationSettings.AppSettings["conn"]); <BR>SqlDataAdapter da=new SqlDataAdapter("select * from dep",conn); <BR>DataSet ds=new DataSet(); <BR>da.Fill(ds,"table1"); <BR>if(e.Item.ItemType==ListItemType.Item||e.Item.ItemType==ListItemType.AlternatingItem) <BR>{ <BR>DropDownList ddl=(DropDownList)e.Item.FindControl("dep"); <BR>ddl.DataSource=ds.Tables["table1"]; <BR>ddl.DataTextField="depname"; <BR>ddl.DataValueField="depid"; <BR>ddl.DataBind(); <BR>ddl.Items.FindByValue(Convert.ToString(DataBinder.Eval(e.Item.DataItem,"depid"))).Selected=true; <BR>} <BR>} <BR><BR>private void DataGrid1_ItemCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e) <BR>{ <BR>if(e.CommandName=="del") <BR>{ <BR>SqlConnection conn=new SqlConnection(System.Configuration.ConfigurationSettings.AppSettings["conn"]); <BR>SqlCommand comm=new SqlCommand("delete from stu where stuid=@id",conn); <BR>SqlParameter parm1=new SqlParameter("@id",SqlDbType.Int); <BR>parm1.Value=this.DataGrid1.DataKeys[e.Item.ItemIndex]; <BR>comm.Parameters.Add(parm1); <BR>conn.Open(); <BR>comm.ExecuteNonQuery(); <BR>conn.Close(); <BR>SetBind(); <BR>} <BR>} <BR><BR>#region Web 窗体设计器生成的代码 <BR>override protected void OnInit(EventArgs e) <BR>{ <BR>// <BR>// CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。 <BR>// <BR>InitializeComponent(); <BR>base.OnInit(e); <BR>} <BR><BR>/// <summary> <BR>/// 设计器支持所需的方法 - 不要使用代码编辑器修改 <BR>/// 此方法的内容。 <BR>/// </summary> <BR>private void InitializeComponent() <BR>{ <BR>this.Load += new System.EventHandler(this.Page_Load); <BR>this.DataGrid1.ItemDataBound += new System.Web.UI.WebControls.DataGridItemEventHandler(this.DataGrid1_ItemDataBound); <BR>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 <BR>} <BR>#endregion <BR>} <BR><BR>public class ColumnTemplate1 : ITemplate <BR>{ <BR>//第一个模板列 <BR>public void InstantiateIn(Control container) <BR>{ <BR>LiteralControl l = new LiteralControl(); <BR>l.DataBinding += new EventHandler(this.OnDataBinding); <BR>//数据绑定 <BR>container.Controls.Add(l); <BR>//为模板列加入LiteralControl <BR>} <BR><BR>public void OnDataBinding(object sender, EventArgs e) <BR>{ <BR>LiteralControl l = (LiteralControl) sender;//LiteralControl发送绑定请求 <BR>DataGridItem container = (DataGridItem) l.NamingContainer; <BR>l.Text = ((DataRowView)container.DataItem)["stuname"].ToString();//绑定stuname字段 <BR>} <BR>} <BR><BR>public class ColumnTemplate2 : ITemplate <BR>{ <BR>//第二个模板列 <BR>public void InstantiateIn(Control container) <BR>{ <BR>DropDownList dpl = new DropDownList(); <BR>dpl.ID="dep"; <BR>container.Controls.Add(dpl); <BR>//加入一个id="dep"的下拉框，数据在DataGrid的ItemDataBound中绑定 <BR>} <BR>} <BR>} <BR></p>
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