C# pdf 文件转图片

　　　　直接贴代码，代码借鉴别人的修改的：

using O2S.Components.PDFRender4NET;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
namespace eService.Code
{
    public static class Pdf2Pic
    {
        public enum Definition
        {
            One = 1, Two = 2, Three = 3, Four = 4, Five = 5,
            Six = 6, Seven = 7, Eight = 8, Nine = 9, Ten = 10
        }
        /// <summary>
        /// 将PDF文档转换为图片的方法
        /// </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 ConvertPDF2Image(string pdfInputPath, string imageOutputPath,
            string imageName, int startPageNum, int endPageNum, ImageFormat imageFormat, Definition definition)
        {
            PDFFile pdfFile = PDFFile.Open(pdfInputPath);
            if (!Directory.Exists(imageOutputPath))
            {
                Directory.CreateDirectory(imageOutputPath);
            }
            if (startPageNum <= 0)
            {
                startPageNum = 1;
            }
            if (endPageNum > pdfFile.PageCount)
            {
                endPageNum = pdfFile.PageCount;
            }
            if (startPageNum > endPageNum)
            {
                int tempPageNum = startPageNum;
                startPageNum = endPageNum;
                endPageNum = startPageNum;
            }
            for (int i = startPageNum; i <= endPageNum; i++)
            {
                Bitmap pageImage = pdfFile.GetPageImage(i - 1, 56 * (int)definition);
                pageImage.Save(imageOutputPath + imageName + i.ToString() + "." + imageFormat.ToString(), imageFormat);
                pageImage.Dispose();
            }
            pdfFile.Dispose();
        }

        /// <summary>
        /// pdf转图片
        /// </summary>
        /// <param name="pdfInputPath">输入pdf文件</param>
        /// <param name="imageOutputPath">输出文件夹</param>
        /// <param name="imageName">图片名称</param>
        /// <param name="imageFormat">图片格式</param>
        /// <returns>图片完整路径</returns>
        public static string ConvertPDFToImage(string pdfInputPath, string imageOutputPath, string imageName, ImageFormat imageFormat)
        {
            PDFFile pdfFile = PDFFile.Open(pdfInputPath);
            if (!Directory.Exists(imageOutputPath))
            {
                Directory.CreateDirectory(imageOutputPath);
            }
            Bitmap pageImage = pdfFile.GetPageImage(0, 56 * (int)Definition.Ten);
            string imagePath = imageOutputPath + imageName + "." + imageFormat.ToString();
            pageImage.Save(imagePath, imageFormat);
            pdfFile.Dispose();
            return imagePath;
        }
    }
}

　　　　调用代码：

 string imagePath= Pdf2Pic.ConvertPDFToImage(pdfPath, HttpContext.Current.Server.MapPath(ReportFile)+"\\", Common.GuId(), ImageFormat.Jpeg);