asp.net将页面中gridview中的数据导入excel表中

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.IO;
namespace AJAXEnabledWebApplication1
{
public partial class excelOutput : System.Web.UI.Page
{
DBClass db = new DBClass();
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
string strsql = "select * from TreeViewTemp where parentID=0";
DataTable dt = db.GetDataTable(strsql);
this.GridView1.DataSource = dt;
this.GridView1.DataBind();
}
}
protected void Button1_Click(object sender, EventArgs e)
{

OutPutExcel();
}
//此处要注意,这个重载方法,一定要写,不然会报类型“GridView”的控件“GridView1”必须放在具有 runat=server 的窗体标记内
public override void VerifyRenderingInServerForm(Control control)
{
}
public void OutPutExcel()
{
//定义文档类型、字符编码
Response.Clear();
Response.Buffer = true;
Response.Charset = "GB2312";
//下面这行很重要， attachment 参数表示作为附件下载，您可以改成 online在线打开
//filename=FileFlow.xls 指定输出文件的名称，注意其扩展名和指定文件类型相符，可以为：.doc 　　 .xls 　　 .txt 　　.htm
Response.AppendHeader("Content-Disposition", "attachment;filename=FileFlow.xls");
Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
//Response.ContentType指定文件类型 可以为application/ms-excel、application/ms-word、application/ms-txt、application/ms-html 或其他浏览器可直接支持文档