C#PDF转图片

 //引用　itextsharp

#region PDF转图片
        /// <summary>
        /// 将PDF转换为图片的方法 /// </summary>
        /// <param name="pdfInputPath">PDF文件路径</param>
        /// <param name="imageOutputPath">图片输出路径</param>
        /// <param name="imageName">生成图片的名字</param>
        /// <param name="startPageNum">从PDF文档的第几页开始转换</param>
        /// <param name="endPageNum">从PDF文档的第几页开始停止转换</param>
        /// <param name="imageFormat">设置所需图片格式</param>
        /// <param name="definition">设置图片的清晰度，数字越大越清晰</param>
        public static void PdfToImage(string pdfInputPath, ImageFormat imageFormat) { string YJ = AppDomain.CurrentDomain.BaseDirectory + "JQ\\"; if (System.IO.Directory.Exists(YJ)) { var files = Directory.GetFiles(YJ); for (int i = 0; i < files.Length; i++) { File.Delete(files[i]); } } string imageOutputPath = AppDomain.CurrentDomain.BaseDirectory + "JQ\\"; int    startPageNum = 1; PDFFile pdfFile = PDFFile.Open(pdfInputPath); int  endPageNum = pdfFile.PageCount; if (!Directory.Exists(imageOutputPath)) { Directory.CreateDirectory(imageOutputPath); } if (startPageNum <= 0) { startPageNum = 1; } if (imageFormat == null) { imageFormat = ImageFormat.Jpeg; }; if (endPageNum > pdfFile.PageCount) { endPageNum = pdfFile.PageCount; } if (startPageNum > endPageNum) { int tempPageNum = startPageNum; startPageNum = endPageNum; endPageNum = startPageNum; } for (int i = 0; i < endPageNum; i++) { //后面乘的那个5是设置清晰度，数字越大越清晰，如果有需要可以设置参数，从外部传参
                Bitmap pageImage = pdfFile.GetPageImage(i, 56 * 2); pageImage.Save(imageOutputPath +i .ToString() + "." + imageFormat.ToString(), imageFormat); pageImage.Dispose(); } pdfFile.Dispose(); } #endregion