/// <summary>
        /// 输出文件
        /// </summary>
        /// <param name="filePath">文件所在路径</param>
        private void OutPutFile(string filePath, string outPutName)
        {

            Byte[] fileData = DownFileFromUrlPath(filePath);
            if (fileData == null)
            {
                HttpContext.Current.Response.Write("file not exist!!");
                HttpContext.Current.Response.End();
            }

            try
            {
                HttpContext.Current.Response.Clear();
                HttpContext.Current.Response.ClearHeaders();
                // HttpContext.Current.Response.BufferOutput = false;
                HttpContext.Current.Response.ContentType = "application/force-download";
                HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(outPutName, System.Text.Encoding.UTF8));
                HttpContext.Current.Response.AddHeader("Content-Length", fileData.Length.ToString());
                HttpContext.Current.Response.BinaryWrite(fileData);
                HttpContext.Current.Response.Flush();
            }
            catch
            {

            }
            finally
            {
                fileData = null;
            }
            HttpContext.Current.Response.End();
        }