在此之前已经写过一篇关于“.net导出word、excel等文件操作类“的文章详见:http://www.cnblogs.com/dreamof/archive/2008/06/24/1229069.html
本文的目的主要是讲讲.net导出excel的技巧及解决以下问题:
(1)出现导出长串数据(如身份证)到EXCEL中后显示为科学计数法的格式,或者报表中显示为001的数据导出到Excel后成了1的格式;
(2)列宽自适应;
涉及到的技巧如下:
(1) 新建一个最原始的DataGrid,对其设置如下:Visible=false,AllowPaging=false;
(2) 导出数据之前将要导出的数据绑定到DataGrid中;
(3) 对长数据如身份证、或类似001的数据库进行格式化,转换为文本格式;
(4) 调用操作类获取DataGrid控件的数据并导出,此时你会发现导出的数据解决了问题(1)并且数据列宽自适应了;
.net导出excel文件操作类如下:

using
System;
using System.Data;
using System.Web;
using System.Text;
using System.IO;
namespace GZPI.Service.AgenciesChannel
{
/// <summary>
/// ExportData 的摘要说明。
/// </summary>
public class ExportData
{
public ExportData()
{
//
// TODO: 在此处添加构造函数逻辑
//
}
/// <summary>
///
/// </summary>
/// <param name="dt"></param>
/// <param name="strFileName"> 含.xls </param>
public static void ExportDataToExcel(DataTable dt, string FileName)
{
try
{
StringWriter sw = new StringWriter();
string colstr = "" ;
foreach (DataColumn col in dt.Columns)
{
colstr += col.ColumnName + " \t " ;
}
sw.WriteLine(colstr);
foreach (DataRow row in dt.Rows)
{
colstr = "" ;
foreach (DataColumn col in dt.Columns)
{
colstr += row[col.ColumnName].ToString() + " \t " ;
}
sw.WriteLine(colstr);
}
sw.Close();
HttpContext.Current.Response.AppendHeader( " Content-Disposition " , " attachment;filename= " + HttpUtility.UrlEncode(FileName + " .xls " , System.Text.Encoding.UTF8));
HttpContext.Current.Response.ContentType = " application/ms-excel " ;
System.Web.HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.Default;
System.Web.HttpContext.Current.Response.Write(sw);
System.Web.HttpContext.Current.Response.End();
}
catch (Exception ex)
{
throw ex;
}
}
public static void ExportDataToExcelByWeb(DataTable dt,System.Web.UI.WebControls.DataGrid DGOutPut, string FileName)
{
try
{
DGOutPut.Visible = true ;
DGOutPut.DataSource = dt;
DGOutPut.DataBind();
System.Web.HttpContext.Current.Response.Clear();
System.Web.HttpContext.Current.Response.Buffer = true ;
System.Web.HttpContext.Current.Response.Charset = " GB2312 " ;
System.Web.HttpContext.Current.Response.AppendHeader( " Content-Disposition " , " attachment;filename= " + FileName + " .xls " );
System.Web.HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.GetEncoding( " GB2312 " ); // 设置输出流为简体中文
System.Web.HttpContext.Current.Response.ContentType = " application/ms-excel " ; // 设置输出文件类型为excel文件。
DGOutPut.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);
DGOutPut.RenderControl(oHtmlTextWriter);
System.Web.HttpContext.Current.Response.Write(oStringWriter.ToString());
System.Web.HttpContext.Current.Response.End();
DGOutPut.Visible = false ;
}
catch (Exception ex)
{
throw ex;
}
}
}
}
using System.Data;
using System.Web;
using System.Text;
using System.IO;
namespace GZPI.Service.AgenciesChannel
{
/// <summary>
/// ExportData 的摘要说明。
/// </summary>
public class ExportData
{
public ExportData()
{
//
// TODO: 在此处添加构造函数逻辑
//
}
/// <summary>
///
/// </summary>
/// <param name="dt"></param>
/// <param name="strFileName"> 含.xls </param>
public static void ExportDataToExcel(DataTable dt, string FileName)
{
try
{
StringWriter sw = new StringWriter();
string colstr = "" ;
foreach (DataColumn col in dt.Columns)
{
colstr += col.ColumnName + " \t " ;
}
sw.WriteLine(colstr);
foreach (DataRow row in dt.Rows)
{
colstr = "" ;
foreach (DataColumn col in dt.Columns)
{
colstr += row[col.ColumnName].ToString() + " \t " ;
}
sw.WriteLine(colstr);
}
sw.Close();
HttpContext.Current.Response.AppendHeader( " Content-Disposition " , " attachment;filename= " + HttpUtility.UrlEncode(FileName + " .xls " , System.Text.Encoding.UTF8));
HttpContext.Current.Response.ContentType = " application/ms-excel " ;
System.Web.HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.Default;
System.Web.HttpContext.Current.Response.Write(sw);
System.Web.HttpContext.Current.Response.End();
}
catch (Exception ex)
{
throw ex;
}
}
public static void ExportDataToExcelByWeb(DataTable dt,System.Web.UI.WebControls.DataGrid DGOutPut, string FileName)
{
try
{
DGOutPut.Visible = true ;
DGOutPut.DataSource = dt;
DGOutPut.DataBind();
System.Web.HttpContext.Current.Response.Clear();
System.Web.HttpContext.Current.Response.Buffer = true ;
System.Web.HttpContext.Current.Response.Charset = " GB2312 " ;
System.Web.HttpContext.Current.Response.AppendHeader( " Content-Disposition " , " attachment;filename= " + FileName + " .xls " );
System.Web.HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.GetEncoding( " GB2312 " ); // 设置输出流为简体中文
System.Web.HttpContext.Current.Response.ContentType = " application/ms-excel " ; // 设置输出文件类型为excel文件。
DGOutPut.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);
DGOutPut.RenderControl(oHtmlTextWriter);
System.Web.HttpContext.Current.Response.Write(oStringWriter.ToString());
System.Web.HttpContext.Current.Response.End();
DGOutPut.Visible = false ;
}
catch (Exception ex)
{
throw ex;
}
}
}
}
实例如下
1、前台代码:
<asp:DataGrid id="DGOutPut" runat="server" Visible="False"></asp:DataGrid>
2、后台代码:

private
void
DGOutPut_ItemDataBound(
object
sender, System.Web.UI.WebControls.DataGridItemEventArgs e)
{
if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
{
e.Item.Cells[ 1 ].Attributes.Add( " style " , " vnd.ms-excel.numberformat:@ " );
}
}
private void BtnOutPut_Click( object sender, System.EventArgs e)
{
DataTable dt = _da.ExecuteDataTable(sql);
GZPI.Service.AgenciesChannel.ExportData.ExportDataToExcelByWeb(dt,DGOutPut, " 续办人事代理业务信息 " );
}
{
if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
{
e.Item.Cells[ 1 ].Attributes.Add( " style " , " vnd.ms-excel.numberformat:@ " );
}
}
private void BtnOutPut_Click( object sender, System.EventArgs e)
{
DataTable dt = _da.ExecuteDataTable(sql);
GZPI.Service.AgenciesChannel.ExportData.ExportDataToExcelByWeb(dt,DGOutPut, " 续办人事代理业务信息 " );
}