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="eMeng.Exam.OutPutExcel" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
<title>OutPutExcel</title>
</HEAD>
<body>
<form id="Form1" method="post" runat="server">
<asp:DataGrid id="DataGrid1" runat="server"></asp:DataGrid>
<asp:Button id="Button1" runat="server" Text="输出到Excel"></asp:Button>
</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 eMeng.Exam
{
/// <summary>
/// OutPutExcel 的摘要说明。
/// </summary>
public class OutPutExcel : System.Web.UI.Page
{
protected System.Web.UI.WebControls.Button Button1;
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
DataGrid1.DataSource=CreateDataSource();
DataGrid1.DataBind();
}
/// <summary>
/// 创建数据源
/// </summary>
/// <returns>DataView</returns>
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 = 100 * i /3.0;
dr = i + 5;
dr = (decimal)dr * (Int32)dr;
dt.Rows.Add(dr);
}
DataView dv = new DataView(dt);
return dv;
}
/// <summary>
/// 输出到Excel
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
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
