DataGrid输出到Excel并进行格式化处理

在我们把DataGrid上的数据导入到Excel的时候，如果遇到比较长的数字字符串，比如身份证号码，就会在Excel里当成数字看待，并转换成科学计数法的格式，造成数据的丢失，下面这个方法就解决了这个问题，并示例如何进行其它的格式化。

OutPutExcel.aspx

<% @ Page language="c#" Codebehind="OutPutExcel.aspx.cs" AutoEventWireup="false" Inherits="Mytest.OutputExcel.OutPutExcel"  %>
DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"  >
< HTML >
     < HEAD >
         < title > OutPutExcel 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  MS_POSITIONING ="GridLayout" >
         < form  id ="Form1"  method ="post"  runat ="server" >
             < FONT  face ="宋体" >
                 < asp:DataGrid  id ="DataGrid1"  style ="Z-INDEX: 101; LEFT: 152px; POSITION: absolute; TOP: 40px"
                    runat ="server" > asp:DataGrid >
                 < asp:Button  id ="Button1"  style ="Z-INDEX: 102; LEFT: 24px; POSITION: absolute; TOP: 48px"  runat ="server"
                    Text ="输出到Excel" > asp:Button > FONT >
         form >
     body >
HTML >

OutPutExcel.aspx.cs:

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 Mytest.OutputExcel
{
    /**//// 

    /// OutPutExcel 的摘要说明。
    /// 

    public class OutPutExcel : System.Web.UI.Page
    {
        protected System.Web.UI.WebControls.DataGrid DataGrid1;
        protected System.Web.UI.WebControls.Button Button1;
    
        private void Page_Load(object sender, System.EventArgs e)
        {
            // 在此处放置用户代码以初始化页面
            DataGrid1.DataSource=CreateDataSource();
            DataGrid1.DataBind();
        }
   /**//// 

   /// 
   /// 

   /// 
        ICollection CreateDataSource() 
        {

            DataTable dt = new DataTable();
            DataRow dr;
            dt.Columns.Add(new DataColumn("身份证号码", typeof(string)));
            dt.Columns.Add(new DataColumn("图书单价",typeof(decimal)));
            dt.Columns.Add(new DataColumn("购买数量",typeof(Int32)));
            dt.Columns.Add(new DataColumn("总价格",typeof(decimal)));


            for (int i = 0; i < 30; i++) 
            {
                dr = dt.NewRow();
                dr[0] = "123456789123456789";
                dr[1] = 100 * i /3.0;
                dr[2] = i + 5;
                dr[3] = (decimal)dr[1] * (Int32)dr[2];                
                dt.Rows.Add(dr);
            }
            DataView dv = new DataView(dt);
            return dv;
        }

        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);
        }
        
        /**//// 

        /// 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。
        /// 

        private void InitializeComponent()
        {    
            this.DataGrid1.ItemDataBound += new System.Web.UI.WebControls.DataGridItemEventHandler(this.DataGrid1_ItemDataBound);
            this.Button1.Click += new System.EventHandler(this.Button1_Click);
            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)
            {
                e.Item.Cells[0].Attributes.Add("style","vnd.ms-excel.numberformat:@");
                e.Item.Cells[3].Attributes.Add("style","vnd.ms-excel.numberformat:￥#,###.00");
            }
        }

        private void Button1_Click(object sender, System.EventArgs e)
        {
            Response.Clear(); 
            Response.Buffer= true; 
            Response.Charset="GB2312";    
            Response.AppendHeader("Content-Disposition","attachment;filename=FileName.xls"); 
            Response.ContentEncoding=System.Text.Encoding.GetEncoding("GB2312");//设置输出流为简体中文
            Response.ContentType = "application/ms-excel";//设置输出文件类型为excel文件。 
            this.EnableViewState = false;    
            System.Globalization.CultureInfo myCItrad = new System.Globalization.CultureInfo("ZH-CN",true);
            System.IO.StringWriter oStringWriter = new System.IO.StringWriter(myCItrad); 
            System.Web.UI.HtmlTextWriter oHtmlTextWriter = new System.Web.UI.HtmlTextWriter(oStringWriter);
            this.DataGrid1.RenderControl(oHtmlTextWriter); 
            Response.Write(oStringWriter.ToString());
            Response.End();

        }

    }
}

文章来源于 http://www.cnblogs.com/zhangzs8896 版权归原作者所有