下面介紹了使用Aspose.Pdf把pdf文件每一頁轉換為圖片的方法。

//選擇pdf文件
            var dialog = new OpenFileDialog();
            dialog.Filter = "pdf文件|*.pdf";
            var dialogResult = dialog.ShowDialog();
            if (dialogResult != System.Windows.Forms.DialogResult.OK) {
                return;
            }

            //和選擇的文件并列創建一個目錄
            string filePath = dialog.FileName;
            string directoryPath = filePath + "目錄";
            //aspose許可證
            Aspose.Pdf.License l = new Aspose.Pdf.License();
            string licenseName = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "Aspose.Total.Product.Family.lic");
            l.SetLicense(licenseName);
            //定義Jpeg轉換設備
            Aspose.Pdf.Document document = new Aspose.Pdf.Document(filePath);
            var device = new Aspose.Pdf.Devices.JpegDevice();
            int quality = int.Parse(this.comboBox1.SelectedItem.ToString());
            directoryPath += quality;
            Directory.CreateDirectory(directoryPath);
            //默認質量為100，設置質量的好壞與處理速度不成正比，甚至是設置的質量越低反而花的時間越長，懷疑處理過程是先生成高質量的再壓縮
            device = new Aspose.Pdf.Devices.JpegDevice(quality);
            //遍歷每一頁轉為jpg
            for (var i = 1; i <= document.Pages.Count; i++) {
                string filePathOutPut = Path.Combine(directoryPath, string.Format("{0}.jpg", i));
                FileStream fs = new FileStream(filePathOutPut, FileMode.OpenOrCreate);
                try {
                    device.Process(document.Pages[i], fs);
                    fs.Close();
                } catch (Exception ex) {
                    fs.Close();
                    File.Delete(filePathOutPut);
                }