(原创)动态模板列更新数据分页的例子

类别:Asp 点击:0 评论:0 推荐:

http://blog.csdn.net/lovecherry/archive/2005/03/25/329977.aspx
在上次给出了动态模板列的一个例子,网友问我更新操作和分页怎么做,下面给出代码。

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">
   <asp:DataGrid ID="DataGrid1" Runat="server"></asp:DataGrid>
  </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
 {
  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)
   {
    BindGrid();
   }
   CreateDataGrid();//进行一些DataGrid的设置
  }
 
  protected void CreateDataGrid()
  { 
   DataGrid1.AutoGenerateColumns=false;//不启用自动生成列
   DataGrid1.CssClass="border";//边框样式
   DataGrid1.BorderWidth=0;
   DataGrid1.CellSpacing=1;
   DataGrid1.CellPadding=5;
   DataGrid1.ItemStyle.CssClass="item";//普通列样式
   DataGrid1.HeaderStyle.CssClass="header";//头样式
   DataGrid1.PagerStyle.CssClass="header";//页脚样式
   DataGrid1.DataKeyField="stuid";//主键字段
   DataGrid1.AllowPaging=true;//允许分页
   DataGrid1.PageSize=5;//分页大小
   DataGrid1.PagerStyle.Mode=PagerMode.NumericPages;//数字形式分页
   EditCommandColumn ecc=new EditCommandColumn();//更新按钮列
   ecc.ButtonType=ButtonColumnType.PushButton;//下压按钮
   ecc.EditText="编辑";
   ecc.CancelText="取消";
   ecc.UpdateText="更新";//按钮文字
   DataGrid1.Columns.Add(ecc);//增加按钮列
   DataGrid1.EditCommand+=new DataGridCommandEventHandler(DataGrid1_EditCommand);
   DataGrid1.UpdateCommand+=new DataGridCommandEventHandler(DataGrid1_UpdateCommand);
   DataGrid1.CancelCommand+=new DataGridCommandEventHandler(DataGrid1_CancelCommand);//更新、取消、编辑事件注册
   DataGrid1.PageIndexChanged += new System.Web.UI.WebControls.DataGridPageChangedEventHandler(DataGrid1_PageIndexChanged);//分页事件注册,这里需要注意注册事件代码的位置,不能放到BindGrid()中
   SetBind();   //绑定数据
  }

  protected void BindGrid()
  {   
   TemplateColumn tm=new TemplateColumn();
   tm.ItemTemplate=new ColumnTemplate1();//普通列
   tm.EditItemTemplate=new ColumnTemplate2();//编辑列
   tm.HeaderText="姓名";
   DataGrid1.Columns.AddAt(0,tm);//在第一列增加第一个模板列
   TemplateColumn tm2=new TemplateColumn();
   tm2.ItemTemplate=new ColumnTemplate3();
   tm2.EditItemTemplate=new ColumnTemplate4();
   tm2.HeaderText="学院";
   DataGrid1.Columns.AddAt(1,tm2);//在第二列增加第一个模板列
   DataGrid1.ItemDataBound += new System.Web.UI.WebControls.DataGridItemEventHandler(DataGrid1_ItemDataBound);//数据绑定事件注册,这里需要注意注册事件代码的位置
   SetBind();
  }

  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)
  {
   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.EditItem)
   {
    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_EditCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
  {
   this.DataGrid1.EditItemIndex=e.Item.ItemIndex;
   BindGrid();
  }

  private void DataGrid1_CancelCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
  {
   this.DataGrid1.EditItemIndex=-1;
   BindGrid();
  }

  private void DataGrid1_UpdateCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
  {
   string uid=e.Item.UniqueID+":";//注意别遗漏冒号
   SqlConnection conn=new SqlConnection(System.Configuration.ConfigurationSettings.AppSettings["conn"]);
   SqlCommand comm=new SqlCommand("update stu set stuname=@name,studepid=@depid where stuid=@id",conn);
   SqlParameter parm1=new SqlParameter("@name",SqlDbType.NVarChar,50);
   parm1.Value=Request.Form[uid+"name"].ToString();
   SqlParameter parm2=new SqlParameter("@depid",SqlDbType.Int);
   parm2.Value=Request.Form[uid+"dep"].ToString();;
   SqlParameter parm3=new SqlParameter("@id",SqlDbType.Int);
   parm3.Value=this.DataGrid1.DataKeys[e.Item.ItemIndex];
   comm.Parameters.Add(parm1);
   comm.Parameters.Add(parm2);
   comm.Parameters.Add(parm3);
   conn.Open();
   comm.ExecuteNonQuery();
   conn.Close();
   this.DataGrid1.EditItemIndex=-1;
   BindGrid();   
//之所以不能采用以前的((TextBox)e.Item.FindControl("name")).Text来取得数据时因为,DataGrid列是动态添加的,根本取不到
  }

  private void DataGrid1_PageIndexChanged(object source, System.Web.UI.WebControls.DataGridPageChangedEventArgs e)
  {
   this.DataGrid1.CurrentPageIndex=e.NewPageIndex;
   BindGrid();
  }

  #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);

  }
  #endregion
 }

 public class ColumnTemplate1 : ITemplate
 {
  
  public void InstantiateIn(Control container)      
  {
   LiteralControl l = new LiteralControl();
   l.DataBinding += new EventHandler(this.OnDataBinding);
   container.Controls.Add(l);   
  }

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

 public class ColumnTemplate2 : ITemplate
 {
  public void InstantiateIn(Control container)      
  {
   TextBox t = new TextBox();
   t.Width=88;
   t.ID="name";//需要给一个id,在Request.Form的时候可以取
   t.DataBinding += new EventHandler(this.OnDataBinding);
   container.Controls.Add(t);   
  }

  public void OnDataBinding(object sender, EventArgs e)
  {
   TextBox t= (TextBox) sender;
   DataGridItem container = (DataGridItem) t.NamingContainer;
   t.Text = ((DataRowView)container.DataItem)["stuname"].ToString();//绑定stuname字段
  }
 }

 public class ColumnTemplate3 : ITemplate
 {
  public void InstantiateIn(Control container)      
  {
   LiteralControl l = new LiteralControl();
   l.DataBinding += new EventHandler(this.OnDataBinding);
   container.Controls.Add(l);   
  }

  public void OnDataBinding(object sender, EventArgs e)
  {
   LiteralControl l = (LiteralControl) sender;
   DataGridItem container = (DataGridItem) l.NamingContainer;
   l.Text = ((DataRowView)container.DataItem)["depname"].ToString();
  }
 }

 public class ColumnTemplate4 : ITemplate
 {
  public void InstantiateIn(Control container)      
  {
   DropDownList dpl = new DropDownList();
   dpl.ID="dep";
   container.Controls.Add(dpl);   
  }//这里没有为这个下拉框进行数据绑定,在DataGrid1的ItemDataBound中进行了这个操作
 }
}

代码比较简单,在代码中有注释简单的解释。
补充2点:(1)这次的DataGrid是在设计生成的,不是上次的运行时,后者会造成更新的紊乱;(2)处于简单,代码中模板列类没有很好的封装,在运用的时候还是应该对字段和模板列类型(ListItemType)进行封装

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