C# pdf转换成图片 或 Bitmap类型

  public IList<string> GenerateThumbnailImage(string InputFile, bool deletePDF, string filename)

        {

            return GenerateImage(InputFile, deletePDF, filename, "-dSAFER -dBATCH -dNOPAUSE -r150 -sDEVICE=jpeg -dGraphicsAlphaBits=4");

        }







        private IList<string> GenerateImage(string InputFile, bool deletePDF, string filename,string Arguments)

        {

             IList<string> result = new List<string>();

            PDFLibrary myPDFLibrary = new PDFLibrary();

            int PDFPageCount = myPDFLibrary.GetPageCount(InputFile);

            if (PDFPageCount==0)

            {

                return result;

            }



            string OutputFile = filename;



            string ExtOut = Path.GetExtension(OutputFile);

            string partOut = OutputFile.Remove(OutputFile.Length - ExtOut.Length, ExtOut.Length);



            if (PDFPageCount == 1)

            {

                OutputFile=partOut+ ".jpg";

                result.Add(OutputFile);

                if (File.Exists(OutputFile))

                {

                    File.Delete(OutputFile);

                }

            }



            else

            {

                for (int i = 0; i < PDFPageCount; i++)

                {

                    string eachFileName = partOut + (i + 1).ToString() + ".jpg";

                    result.Add(eachFileName);

                    if (File.Exists(eachFileName))

                    {

                        File.Delete(eachFileName);

                    }

                }



                OutputFile = OutputFile.Remove(OutputFile.Length - ExtOut.Length, ExtOut.Length);

                OutputFile += "%d.jpg";

            }

           



            

            ProcessStartInfo info = new ProcessStartInfo();

            info.CreateNoWindow = true;

            info.WindowStyle = ProcessWindowStyle.Hidden;

            info.WorkingDirectory = System.Configuration.ConfigurationManager.AppSettings["GhostScriptView"];

            info.Arguments =Arguments+ @" -sOutputFile=" + OutputFile + "  " + InputFile;

            info.FileName = @"gswin32c.exe";

            Process subProcess = new Process();

            subProcess.StartInfo = info;

            subProcess.Start();

            subProcess.WaitForExit(int.MaxValue);

            if (deletePDF)

            {

                System.IO.File.Delete(InputFile);

            }

            return result;

            

        }