datagrid多层表头及datagrid列动态统计功能的实现

    1.datagrid多层表头功能的实现
     实际上Asp.Net下的DataGrid是一个HtmlTable，只不过在HtmlTable的基础上添加了很多属性、方法，纳入ViewState机制，来生成、控制它；有了这一点认识，事情就很好办了，我们可以在属性生成器中定义列的表头，它实际上只不过是在列之间插入了“</td><td>”的html标记，如此而已。
    我们可以在DataGrid中的ItemCreated事件中处理，代码如下：   

         private   void  DataGrid1_ItemCreated( object  sender, System.Web.UI.WebControls.DataGridItemEventArgs e)
         {
            if(e.Item.ItemType==ListItemType.Header)
            {
                TableCellCollection tcl=e.Item.Cells;
                tcl.Clear();
                tcl.Add(new TableHeaderCell());
                tcl[0].RowSpan=2;
                tcl[0].Text="项目";

                tcl.Add(new TableHeaderCell());
                tcl[1].ColumnSpan =4;                
                tcl[1].Text="第一季度个人消费情况表</th></tr><tr><td rowspan =\"2\">姓名</td><td colspan=\"3\" align=\"center\">帐目统计</td></tr><tr><td>项目一</td><td>项目二</td><td>项目三</td>";    
            }
    
        }

    2.datagrid列动态统计功能的实现
    首先需要允许DataGrid的页脚显示，用于显示统计列值；
　 具体的实现可以在DataGrid中的ItemCreated事件中处理，代码如下：  (intSum1,intSum2,intSum3是全局变量)     

         private   void  DataGrid1_ItemDataBound( object  sender, System.Web.UI.WebControls.DataGridItemEventArgs e)
         {
            if(e.Item.ItemIndex >= 0)
            {
                //取指定列的数据总和
                intSum1 += int.Parse(e.Item.Cells[1].Text.ToString());
                intSum2 += int.Parse(e.Item.Cells[2].Text.ToString());
                Label lblQuantity = (Label)e.Item.Cells[3].FindControl("lblQuantity");　
                intSum3 += int.Parse(lblQuantity.Text.ToString());
            }
            else if(e.Item.ItemType == ListItemType.Footer)
            {
                e.Item.Cells[0].Text = "<font color='red'>总计：</font>";　　　
                e.Item.Cells[1].Text = "<font color='red'>"+intSum1.ToString()+"</font>";　
                e.Item.Cells[2].Text = "<font color='red'>"+intSum2.ToString()+"</font>";　
                e.Item.Cells[3].Text = "<font color='red'>"+intSum3.ToString()+"</font>";　
            }
        }

    3.综合实例　
    为了帮助大家理解上面功能的实现，我把一个具体实例的代码贴出来以供大家参考！　    
    前台代码

<% @ Page language = " c# "  Codebehind = " InSum.aspx.cs "  AutoEventWireup = " false "  Inherits = " FLX.Portal.InSum "   %>
<! DOCTYPE HTML PUBLIC  " -//W3C//DTD HTML 4.0 Transitional//EN "   >
< HTML >
     < HEAD >
         < title > InSum </ title >
         < meta name = " GENERATOR "  Content = " Microsoft Visual Studio .NET 7.1 " >
         < meta name = " CODE_LANGUAGE "  Content = " C# " >
         < meta name = " vs_defaultClientScript "  content = " JavaScript " >
         < meta name = " vs_targetSchema "  content = " http://schemas.microsoft.com/intellisense/ie5 " >
     </ HEAD >
     < body >
         < form id = " Form1 "  method = " post "  runat = " server " >
             < asp:datagrid id = " DataGrid1 "  runat = " server "  AutoGenerateColumns = " False "  Width = " 100% "  BorderColor = " #CCCCCC "
                BorderStyle = " None "  BorderWidth = " 1px "  BackColor = " White "  CellPadding = " 3 "  AllowPaging = " True "
                Font - Size = " 12px "  ShowFooter = " True " >
                 < FooterStyle ForeColor = " #000066 "  BackColor = " White " ></ FooterStyle >
                 < SelectedItemStyle Font - Bold = " True "  ForeColor = " White "  BackColor = " #669999 " ></ SelectedItemStyle >
                 < ItemStyle ForeColor = " #000066 "  BorderColor = " #D4D0C8 " ></ ItemStyle >
                 < HeaderStyle ForeColor = " Black "  BackColor = " #E1EEFE " ></ HeaderStyle >
                 < Columns >
                     < asp:BoundColumn DataField = " id "  HeaderText = " id " ></ asp:BoundColumn >
                     < asp:BoundColumn DataField = " count1 "  HeaderText = " count1 " ></ asp:BoundColumn >
                     < asp:BoundColumn DataField = " count2 "  HeaderText = " count2 " ></ asp:BoundColumn >
                     < asp:TemplateColumn HeaderText = " count3 " >
                         < ItemTemplate >
                             < asp:Label id = lblQuantity runat = " server "  Text = ' <%# DataBinder.Eval(Container, "DataItem.count3") %> ' >
                             </ asp:Label >
                         </ ItemTemplate >
                     </ asp:TemplateColumn >
                 </ Columns >
                 < PagerStyle HorizontalAlign = " Left "  ForeColor = " #000066 "  BackColor = " White "  Mode = " NumericPages " ></ PagerStyle >
             </ asp:datagrid >
         </ form >
     </ body >
</ HTML >

     后台代码

using  System;
using  System.Collections;
using  System.ComponentModel;
using  System.Data;
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  FLX.Portal
{
    /**//// <summary>
    /// InSum 的摘要说明。
    /// </summary>
    public class InSum : PortalPagePersonal
    {
        public int intSum1=0;
        public int intSum2=0;
        public int intSum3=0;
        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(!this.IsPostBack)
            {
                this.DataGrid1.DataSource =this.GetDataBind();
                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.ItemCreated += new System.Web.UI.WebControls.DataGridItemEventHandler(this.DataGrid1_ItemCreated);
            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.ItemIndex >= 0)
            {
                //取指定列的数据总和
                intSum1 += int.Parse(e.Item.Cells[1].Text.ToString());
                intSum2 += int.Parse(e.Item.Cells[2].Text.ToString());
                Label lblQuantity = (Label)e.Item.Cells[3].FindControl("lblQuantity");　
                intSum3 += int.Parse(lblQuantity.Text.ToString());
            }
            else if(e.Item.ItemType == ListItemType.Footer)
            {
                e.Item.Cells[0].Text = "<font color='red'>总计：</font>";　　　
                e.Item.Cells[1].Text = "<font color='red'>"+intSum1.ToString()+"</font>";　
                e.Item.Cells[2].Text = "<font color='red'>"+intSum2.ToString()+"</font>";　
                e.Item.Cells[3].Text = "<font color='red'>"+intSum3.ToString()+"</font>";　
            }
        }
        private DataTable GetDataBind()
        {
            string sql="select * from Count";
            DataTable dt=new DataTable();
            dt=this.DataAccessFacade.ExecuteDataTable(sql);
            return dt;
        }

        private void DataGrid1_ItemCreated(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)
        {
            if(e.Item.ItemType==ListItemType.Header)
            {
                TableCellCollection tcl=e.Item.Cells;
                tcl.Clear();
                tcl.Add(new TableHeaderCell());
                tcl[0].ColumnSpan =4;                
                tcl[0].Text="第一季度个人消费情况表</th></tr><tr><td rowspan =\"2\">姓名</td><td colspan=\"3\" align=\"center\">帐目统计</td></tr><tr><td>项目一</td><td>项目二</td><td>项目三</td>";            
            }
        }
    }
}

     效果展示