/// 
        /// 导出为Excel        /// 
        /// 控件        /// 导出格式        /// 文件名        public static void ConvertToExcel(System.Web.UI.Control control, string encoding, string filename)        {            //设置文件名格式，防止中文文件名乱码            string FileName = System.Web.HttpUtility.UrlEncode(Encoding.UTF8.GetBytes(filename));            System.Web.HttpContext.Current.Response.Clear();            System.Web.HttpContext.Current.Response.Buffer = true;            System.Web.HttpContext.Current.Response.Charset = "" + encoding + "";            //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            System.Web.HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment;filename=" + FileName);            System.Web.HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.GetEncoding("" + encoding + "");            //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            System.Web.HttpContext.Current.Response.ContentType = "application/ms-excel";            control.EnableViewState = false;            //　定义一个输入流            System.IO.StringWriter oStringWriter = new System.IO.StringWriter();            System.Web.UI.HtmlTextWriter oHtmlTextWriter = new System.Web.UI.HtmlTextWriter(oStringWriter);            control.RenderControl(oHtmlTextWriter);            //this 表示输出本页，你也可以绑定datagrid,或其他支持obj.RenderControl()属性的控件            System.Web.HttpContext.Current.Response.Write(oStringWriter.ToString());            System.Web.HttpContext.Current.Response.End();        }

此方法作为渲染输出!  /// 
        /// 此方法必重写，否则会出错        /// 
        ///         public override void VerifyRenderingInServerForm(Control control)        {        }