将数据导出至Excel（非标准Excel）

        ///<summary> 
        ///将DataTable中的数据导出到指定的Excel文件中         
        ///</summary>         
        ///<param   name="page">Web页面对象</param> 
        ///<param   name="tab">包含被导出数据的DataTable对象</param>         
        ///<param   name="FileName">Excel文件的名称</param>     
        public static void Export(System.Web.UI.Page page, System.Data.DataTable tab, string FileName)
        {
            System.Web.HttpResponse httpResponse = page.Response;
            System.Web.UI.WebControls.DataGrid dataGrid = new System.Web.UI.WebControls.DataGrid();
            dataGrid.DataSource = tab.DefaultView;
            dataGrid.AllowPaging = false;
            dataGrid.HeaderStyle.BackColor = System.Drawing.Color.White;
            dataGrid.HeaderStyle.HorizontalAlign = HorizontalAlign.Center;
            dataGrid.HeaderStyle.Font.Bold = true;
            dataGrid.DataBind();
            httpResponse.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(FileName, System.Text.Encoding.UTF8));
            //filename="*.xls";           
            httpResponse.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
            httpResponse.ContentType = "application/ms-excel";
            System.IO.StringWriter tw = new System.IO.StringWriter();
            System.Web.UI.HtmlTextWriter hw = new System.Web.UI.HtmlTextWriter(tw);
            dataGrid.RenderControl(hw);
            string filePath = page.Server.MapPath("..") + "//Files//" + FileName;
            System.IO.StreamWriter sw = System.IO.File.CreateText(filePath);
            sw.Write(tw.ToString());
            sw.Close();
            DownFile(httpResponse, FileName, filePath);
            httpResponse.End();
            System.IO.File.Delete(filePath);
        }

        private static 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) + ";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;
            }
        }