/// <summary>      /// 文件下载      /// </summary>      /// <param name="FileName">文件名</param>      /// <param name="FilePath">路径</param>      public void BigFileDownload(string FileName, string FilePath)    {        try        {            //以字符流的形式下载文件            FileStream fs = new FileStream(filepath, FileMode.Open);            byte[] bytes = new byte[(int)fs.Length];            fs.Read(bytes, 0, bytes.Length);            fs.Close();            Response.ContentType = "application/octet-stream;charset=gb2321";            //通知浏览器下载文件而不是打开;对中文名称进行编码            Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(FileName, System.Text.Encoding.UTF8));            Response.BinaryWrite(bytes);            Response.Flush();            Response.End();         }        catch (Exception ex)        {                    }        finally        {            Response.Flush();            Response.End();         }    }