extjs 导出。借助gridview

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using Entity.DAL;
using System.Text;
using System.Collections;

namespace Entity
{
    public partial class WebForm3 : System.Web.UI.Page
    { 
     

        protected void Page_Load(object sender, EventArgs e)
        {   Hashtable ht = new Hashtable();
           // ht.Add("ID1", "ID1");
            ht.Add("UserName", "名称");
            ht.Add("Age", "年龄");
            ht.Add("Sex", "性别");
            ht.Add("tel", "电话");
            GridView1.Columns.Clear();
            GridView1.AutoGenerateColumns = false;
            foreach (DictionaryEntry de in ht)
            { 
                BoundField bf = new BoundField();
               
                bf.DataField = de.Key.ToString();
                bf.HeaderText = de.Value.ToString();

                GridView1.Columns.Add(bf);

            }
            this.GridView1.DataSource = UsersDAL.GetList();
           // this.GridView1.Columns["UserName"]=
           
            this.GridView1.DataBind();
           Export("application/ms-excel", "导出测试.xls", this.GridView1);
        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            Response.Write(Excel.GetExcel());
        }
        public override void VerifyRenderingInServerForm(Control control)
        {
        }  

        //导出到Excel   
        private void Export(string FileType, string FileName,GridView gd)
        {
            //以下三行可选，如果没有的话导出的只是当前页数据，没有其他页数据   
            //gvFieldData.AllowPaging = false;   
            //gvFieldData.AllowSorting = false;   
            //GetFieldInfo(false, "obj_name"); //这里是你绑定gridview的方法   
           // gd.Columns[0].Visible = false;  //导出时隐藏操作列   
           // gd.BottomPagerRow.Visible = false;  //隐藏分页行   
            //string style = @"<style> .text { mso-number-format:\@; } </script> ";   
            Response.Clear();
            Response.Buffer = true;
            //Response.Charset = "GB2312";   
            Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312"); // 中文   
            Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(FileName, Encoding.UTF8).ToString());
            // 如果设置为 GetEncoding("GB2312");导出的文件将会出现乱码！！！   
            //Response.ContentEncoding = System.Text.Encoding.UTF7;   
            Response.ContentType = "application/ms-excel";//设置输出文件类型为excel文件。   
            System.IO.StringWriter oStringWriter = new System.IO.StringWriter();
            System.Web.UI.HtmlTextWriter oHtmlTextWriter = new System.Web.UI.HtmlTextWriter(oStringWriter);
            gd.RenderControl(oHtmlTextWriter);
            //Response.Write(style);   
            Response.Output.Write(oStringWriter.ToString());
           // Response.Flush();
            Response.End();

        }
    
        protected void GridView2_SelectedIndexChanged(object sender, EventArgs e)
        {

        }   

    }
}