1 /// <summary> 2         /// 将PDF文档转换为图片的方法 3         /// </summary> 4         /// <param name="pdfInputPath">PDF文件路径</param> 5         /// <param name="imageOutputPath">图片输出完整路径(包括文件名)</param> 6         /// <param name="startPageNum">从PDF文档的第几页开始转换</param> 7         /// <param name="endPageNum">从PDF文档的第几页开始停止转换</param> 8         /// <param name="imageFormat">设置所需图片格式</param> 9         /// <param name="definition">设置图片的清晰度，数字越大越清晰</param>10         private static void ConvertPdf2Image(string pdfInputPath, string imageOutputPath,11              int startPageNum, int endPageNum, ImageFormat imageFormat, int definition)12         {13             14             PDFFile pdfFile = PDFFile.Open(pdfInputPath);15             16             if (startPageNum <= 0)17             {18                 startPageNum = 1;19             }20 21             if (endPageNum > pdfFile.PageCount)22             {23                 endPageNum = pdfFile.PageCount;24             }25 26             if (startPageNum > endPageNum)27             {28                 int tempPageNum = startPageNum;29                 startPageNum = endPageNum;30                 endPageNum = startPageNum;31             }32 33             var bitMap = new Bitmap[endPageNum];34 35             for (int i = startPageNum; i <= endPageNum; i++)36             {37                 Bitmap pageImage = pdfFile.GetPageImage(i - 1, 56 * definition);
38                 Bitmap newPageImage = new Bitmap(pageImage.Width/4 , pageImage.Height/4);39 40                 Graphics g = Graphics.FromImage(newPageImage);41                 g.InterpolationMode = InterpolationMode.HighQualityBicubic;
　　　　　　　　　　　//重新画图的时候Y轴减去130，高度也减去130  这样水印就看不到了42                 g.DrawImage(pageImage, new Rectangle(0, 0, pageImage.Width/4 , pageImage.Height/4),43                     new Rectangle(0, 130, pageImage.Width, pageImage.Height-130), GraphicsUnit.Pixel);44 45                 bitMap[i - 1] = newPageImage;46 　　　　　　　　　g.Dispose();47             }48 49             //合并图片50             var mergerImg = MergerImg(bitMap);51             //保存图片52             mergerImg.Save(imageOutputPath, imageFormat);53             pdfFile.Dispose();54         }55 56         /// <summary>57         /// 合并图片58         /// </summary>59         /// <param name="maps"></param>60         /// <returns></returns>61         private static Bitmap MergerImg(params Bitmap[] maps)62         {63             int i = maps.Length;64             65             if (i == 0)66                 throw new Exception("图片数不能够为0");67             else if (i == 1)68                 return maps[0];69 70             //创建要显示的图片对象,根据参数的个数设置宽度71             Bitmap backgroudImg = new Bitmap(maps[0].Width, i * maps[0].Height);72             Graphics g = Graphics.FromImage(backgroudImg);73             //清除画布,背景设置为白色74             g.Clear(System.Drawing.Color.White);75             for (int j = 0; j < i; j++)76             {77                 g.DrawImage(maps[j], 0, j * maps[j].Height, maps[j].Width, maps[j].Height);78             }79             g.Dispose();80             return backgroudImg;81         }