请问C#调用WPS打开word，excel并转成PDF文件

private string adobePdfPrint = "Adobe PDF";        private string adobeDisPrint = "Acrobat Distiller";        private string regRoot = "SOFTWARE//Adobe//Acrobat Distiller//";        private string printerFileName = "acrodist.exe";        private string regName = "InstallPath";        /// <summary>        /// 获取acrodist.exe的安装路径        /// </summary>        /// <returns></returns>        private string GetAdobeDisFilePath()        {            RegistryKey regKey = null;            RegistryKey acrodistKey = null;            string printerName = string.Empty;            int i;            string regRootVersion = string.Empty;            regKey = Registry.LocalMachine;            // acrodist的4-8版本适用            for (i = 4; i < 9; i++)            {                regRootVersion = string.Format("{0}{1}.0", regRoot, i);                acrodistKey = regKey.OpenSubKey(regRootVersion);                if (acrodistKey != null)                {                    printerName = acrodistKey.GetValue(regName, "") + "//" + printerFileName;                    if (File.Exists(printerName))                    {                        return printerName;                    }                }            }            throw new Exception("Acrobat Distiller printer not found!");        }        /// <summary>        /// 获取Adobe Printer         /// "Adobe PDF" 或 "Acrobat Distiller"         /// </summary>        /// <returns></returns>        private string GetAdobePrinter()        {            foreach (string printername in PrinterSettings.InstalledPrinters)            {                if (printername.ToUpper().IndexOf(adobePdfPrint.ToUpper()) != -1 || printername.ToUpper().IndexOf(adobeDisPrint.ToUpper()) != -1)                {                    return printername;                                    }            }            return string.Empty;        }        public void ConvertWord2Pdf(string sourceFile)        {            if (PrinterSettings.InstalledPrinters.Count == 0)                throw new Exception("Did not find the printer, please install the printer.");            if (!File.Exists(sourceFile))                throw new Exception(string.Format("File not found:{0}", sourceFile));             string strDir = Path.GetDirectoryName(sourceFile);            string strName = Path.GetFileNameWithoutExtension(sourceFile);            string prnFile = string.Format("{0}//{1}.prn",strDir,strName);            string pdfFile =  string.Format("{0}//{1}.pdf",strDir,strName);            object objPrnFile = (object)prnFile;            object background = true;            object printToFile = true;            object collate = true;            object append = false;            object manualDuplexPrint = false;            object copies = false;            object range = Word.WdPrintOutRange.wdPrintAllDocument;            object missing = System.Reflection.Missing.Value;            string msg = string.Empty;                        string adobePrinter = GetAdobePrinter();            if (adobePrinter.Length == 0)                throw new Exception("Did not find Adobe PDF printer or Acrobat Distiller printer, please install the printer.");                                   IWord word = new Word2003Factory().CreateWord();            // 打开Word文档            Word.Document doc = word.OpenDocument(sourceFile);            string oldPrint = doc.Application.ActivePrinter;            // 将Adobe Printer设置为默认打印机            doc.Application.ActivePrinter = adobePrinter;            DateTime start = DateTime.Now;            DateTime end = start.AddSeconds(20);            // Word文档打印到Prn文件            doc.PrintOut(ref background, ref append, ref range, ref objPrnFile, ref missing, ref missing,                ref missing, ref missing,ref missing, ref printToFile, ref collate, ref missing, ref missing,                ref missing, ref missing, ref missing, ref missing, ref missing);                                  while (!File.Exists(prnFile))            {                if (DateTime.Now > end)                {                    throw new Exception("Word document print to prn document overtime");                                    }                else                {                    Application.DoEvents();                }                            }            doc.Application.ActivePrinter = oldPrint;            word.Close(false);                        doc = null;            word = null;            // Prn装PDF            Process objProcess = new Process();            objProcess.StartInfo.CreateNoWindow = true;            objProcess.StartInfo.UseShellExecute = false;            objProcess.StartInfo.FileName = GetAdobeDisFilePath();            objProcess.StartInfo.Arguments = prnFile;            start = DateTime.Now;            end = start.AddSeconds(20);            objProcess.Start();            while (!File.Exists(pdfFile))            {                if (DateTime.Now > end)                {                    throw new Exception("Word document print to prn document overtime");                }                else                {                    Application.DoEvents();                }                            }            objProcess.CloseMainWindow();            //if (File.Exists(prnFile))            //{            //    File.Delete(prnFile);            //}            /*            ACRODISTXLib.PdfDistiller pdfDis = new ACRODISTXLib.PdfDistiller();            pdfDis.FileToPDF(prnFile, pdfFile, string.Empty);            start = DateTime.Now;            end = start.AddSeconds(20);            while(!File.Exists(pdfFile))            {                if (DateTime.Now > end)                {                    throw new Exception("prn document print to pdf document overtime");                }                else                {                    Application.DoEvents();                }             }                                    pdfDis = null;                        */        }