关于gridview的数据 导出exelc

    /// <summary>
        /// 导出为Excel
        /// </summary>
        /// <param name="control">控件</param>
        /// <param name="encoding">导出格式</param>
        /// <param name="filename">文件名</param>
        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!
 /// <summary>
        /// 此方法必重写，否则会出错
        /// </summary>
        /// <param name="control"></param>
        public override void VerifyRenderingInServerForm(Control control)
        {

        }