asp.net jpg 转 PDF 并提供下载

        /// <summary>
        /// 下载按钮
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected void Button2_Click(object sender, EventArgs e)
        {
            using (var imageStream = new FileStream(MapPath("~/views") + "/print.pdf", FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
            {
              byte[] bytes =  this.StreamToBytes(imageStream);
              this.Download(bytes, "pdf");
            }
        }
        /// <summary>
        /// 在服务器上生成一个PDF COPY
        /// </summary>
        private void CreatePDF()
        {
            var bytes = GetData();

            int width = bytes.ToImage().Width;
            int height = bytes.ToImage().Height;
            Document document = new Document(new Rectangle(width, height), 0, 0, 0, 0);
            using (var stream = new FileStream(MapPath("~/views") + "/print.pdf", FileMode.Create, FileAccess.Write, FileShare.None))
            {
                PdfWriter.GetInstance(document, stream);
                document.Open();
                using (Stream imageStream = new MemoryStream(bytes))
                {
                    var image = iTextSharp.text.Image.GetInstance(imageStream);
                    document.Add(image);
                }
                document.Close();
            }
        }

        /// <summary>
        /// 下载到本地
        /// </summary>
        /// <param name="bytes"></param>
        /// <param name="fileType"></param>
        public void Download(byte[] bytes ,string fileType)
        {
            Response.Buffer = true;
           // Page.Response.Clear();//清除缓冲区所有内容
            Page.Response.ContentType = "application/octet-stream";
            Page.Response.AddHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode("print."+fileType));
            byte[] file = bytes;
            Response.BinaryWrite(file);
            Response.Flush();
            Response.End();
        }

使用第三方dll：iTextSharp 。

这里图片被转成了byte[]放在cache中，如果是本地磁盘上的 则

var imageStream =newFileStream("test.jpg",FileMode.Open,FileAccess.Read,FileShare.ReadWrite)

这样处理。

页面初始化的时候调用下CreatePDF