使用iTextSharp将图片批量转换为PDF

  /// <summary>
        /// 将图片转化成Pdf格式
        /// </summary>
        /// <param name="files">文件集合</param>
        /// <param name="newpdf">新PDF路径</param>
        /// <returns>是否成功</returns>
        public bool ImageConvertToPDF(string[] files, string newpdf)
        {
            bool fag = true;
            iTextSharp.text.Document document = new iTextSharp.text.Document(iTextSharp.text.PageSize.A4, 25, 25, 25, 25);

            try
            {
                iTextSharp.text.pdf.PdfWriter.GetInstance(document, new FileStream(newpdf, FileMode.Create, FileAccess.ReadWrite));

                document.Open();
                iTextSharp.text.Image image;
                for (int i = 0; i < files.Length; i++)
                {
                    image = iTextSharp.text.Image.GetInstance(files[i]);

                    if (image.Height > iTextSharp.text.PageSize.A4.Height - 25)
                    {
                        image.ScaleToFit(iTextSharp.text.PageSize.A4.Width - 25, iTextSharp.text.PageSize.A4.Height - 25);
                    }
                    else if (image.Width > iTextSharp.text.PageSize.A4.Width - 25)
                    {
                        image.ScaleToFit(iTextSharp.text.PageSize.A4.Width - 25, iTextSharp.text.PageSize.A4.Height - 25);
                    }
                    image.Alignment = iTextSharp.text.Image.ALIGN_MIDDLE;