ASP.Net之浏览器下载自定义的PDF文件

{
   
        string absolutePath = SetFullPath();
        printpdf pdf = new printpdf();
        IQueryable<视图或表名> aa= db.视图或表名.AsNoTracking();
        pdf.PrintDetailReWrite(aa, 起始日期, 结束日期, xxxxx, reportCriteria,timeZone);


        download(pdf.fileName, ".pdf", type);
        FileInfo file = new FileInfo(absolutePath + pdf.fileName + ".pdf");
        file.Delete();
}

        private static string SetFullPath()
        {
   
            string absolutePath1 = ConfigurationManager.AppSettings["PDFTestFolder"];//配置文件AppSettings中进行配置
            if (string.IsNullOrEmpty(absolutePath1))
            {
   
                absolutePath1 = "C:\\test\\download\\";//指定缓存路径
            }
            return absolutePath1;
        }


        private void download(string serverFileName, string fileType, int reportType)
        {
   
            string fileName = "";
            switch (reportType)
            {
   
                case 1:
                    fileName += "文件名前半部分";//根据不同的下载类型，进行设置
                    break;
            }
            fileName += DateTime.UtcNow.ToString("yyyyMMddHHmmss") + fileType;//客户端保存的文件名
            string filePath = absolutePath + serverFileName + fileType;// Server.MapPath("~/pdf/" + serverFileNmae + fileType);//路径

            //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 =