C#之获取PDF张数以及PDF转JPG

一：打开管理NuGet程序包进行安装Aspose.Pdf.dll

二：实践

(1)获取PDF页数

/// <summary>
        /// 获取PDF文件页数
        /// </summary>
        /// <param name="file"></param>
        /// <returns></returns>
        public int GetPdfNumber(HttpPostedFile file)
        {
            int pageCount;

            //上传临时文件
            var picName = Guid.NewGuid().ToString();

            //获取图片保存路径            
            var path = Config.FilePath + "\" + "tmppic\";

            //图片的路径及名称

            var fileinfo = new FileInfo(file.FileName);
            var ext = fileinfo.Extension;
            var filePath = path + picName + ext;

            //创建路径
            var dir = new DirectoryInfo(path);
            if (!dir.Exists)
            {
                dir.Create();
            }
            file.SaveAs(filePath);

            var reader = new PdfReader(filePath);
            pageCount = reader.NumberOfPages;
            reader.Close();

            File.Delete(filePath);

            return pageCount;
        }

(2) PDF转JPG

                        {
                            //保存pdf信息到附件表
                            var device = new Aspose.Pdf.Devices.JpegDevice(80);
                            var path = Config.FilePath + "\" + item.FilePath;
                            //pdf转为图片
                            using (var document = new Aspose.Pdf.Document(path))
                            {
                                for (var t = 1; t <= document.Pages.Count; t++)
                                {
                                    //图片名称
                                    var newName = Guid.NewGuid().ToString("N");

                                    //保存图片
                                    var lastIndex = item.FilePath.LastIndexOf('\');
                                    var newPath = item.FilePath.Substring(0, lastIndex + 1);
                                    var filePath = Config.FilePath + "\" + newPath + newName + ".jpg";
                                    var temp_path = newPath + newName + ".jpg";
                                    var fileInfo = new FileInfo(filePath);
                                    using (var fs = new FileStream(filePath, FileMode.OpenOrCreate))
                                    {
                                        device.Process(document.Pages[t], fs);
                                        fs.Close();
                                    }
                                }
                            }