(原)excel导出

private void Button1_Click(object sender, System.EventArgs e)
        {
            // 导出Excel
            Response.Clear();
            Response.Buffer          = true;
            Response.AppendHeader("Content-Disposition","attachment;filename=当月工程量统计表.xls"); //定义输出文件和文件名        
            Response.ContentType     = "application/vnd.ms-excel";
            Response.Charset         = "GB2312";
            Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
            this.EnableViewState     = false;
  
            StringWriter sw          = new StringWriter();
            HtmlTextWriter htw       = new HtmlTextWriter(sw);
            //this.SpanProjInfo.RenderControl(htw);
            
            Response.Write(sw.ToString());
            Response.End();

            //---------------------------
            System.Web.HttpResponse httpResponse = Page.Response;
            httpResponse.AppendHeader("Content-Disposition","attachment;filename="+HttpUtility.UrlEncode(this.hid_reportname.Value,System.Text.Encoding.UTF8) + DateTime.Now.ToString("yyyyMMdd") + ".xls"); 
            httpResponse.ContentEncoding=System.Text.Encoding.GetEncoding("GB2312");
            httpResponse.ContentType =  "application/vnd.ms-excel";
            System.IO.StringWriter  tw = new System.IO.StringWriter() ;
            System.Web.UI.HtmlTextWriter hw = new System.Web.UI.HtmlTextWriter (tw);
            this.SpanProjInfo.RenderControl(hw);
            string filePath2 = Request.PhysicalApplicationPath+"Download\\xx.xls";
            System.IO.StreamWriter sw = System.IO.File.CreateText(filePath2);
            sw.Write(tw.ToString());
            sw.Close();

            DownFile(httpResponse,"ttt",filePath2);
            httpResponse.End();
        }

        private void btnExcel_ServerClick(object sender, System.EventArgs e)
        {
            // 导出Excel
            Response.Clear();
            Response.Buffer          = true;
            Response.AppendHeader("Content-Disposition","attachment;filename="+this.hid_reportname.Value); //定义输出文件和文件名        
            Response.ContentType     = "application/vnd.ms-excel";
            Response.Charset         = "GB2312";
            Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
            this.EnableViewState     = false;
  
            StringWriter sw          = new StringWriter();
            HtmlTextWriter htw       = new HtmlTextWriter(sw);
            //this.SpanProjInfo.RenderControl(htw);
            
            Response.Write(SpanProjInfo.InnerHtml.ToString());
            Response.End();

        
        }
        public  bool DownFile(System.Web.HttpResponse Response,string fileName,string fullPath)
        {
            try
            {
                Response.ContentType = "application/octet-stream";

                Response.AppendHeader("Content-Disposition","attachment;filename=" + 
                    HttpUtility.UrlEncode(fileName,System.Text.Encoding.UTF8) + DateTime.Now.ToString("yyyyMMdd") + ".xls;charset=GB2312");
                System.IO.FileStream fs= System.IO.File.OpenRead(fullPath);
                long fLen=fs.Length;
                int size=102400;//每100K同时下载数据 
                byte[] readData = new byte[size];//指定缓冲区的大小 
                if(size>fLen)size=Convert.ToInt32(fLen);
                long fPos=0;
                bool isEnd=false;
                while (!isEnd) 
                { 
                    if((fPos+size)>fLen)
                    {
                        size=Convert.ToInt32(fLen-fPos);
                        readData = new byte[size];
                        isEnd=true;
                    }
                    fs.Read(readData, 0, size);//读入一个压缩块 
                    Response.BinaryWrite(readData);
                    fPos+=size;
                } 
                fs.Close(); 
                System.IO.File.Delete(fullPath);
                return true;
            }
            catch
            {
                return false;
            }
        }