如何把rtf、doc文件转换为HTML文件

//retText是路径
 1  public string ExtractHtml(string rtfText)
         {
             try
             {
                 //Create word object
                 Word.Application applicationObject = new Word.Application();
                 Type wordType = applicationObject.GetType();

                 //define path for save your temporary file.
                 string userTemp = @"F:\Code\DisplayPrintfile\DisplayPrintfile\file\";
                 //Open and save your rtf as HTML in your temp path.
                 object missing = Type.Missing;
                 object fileName = rtfText;
                 object False = false;
                 object rtfFileFormt = Word.WdSaveFormat.wdFormatRTF;
                 applicationObject.DisplayAlerts = Microsoft.Office.Interop.Word.WdAlertLevel.wdAlertsNone;

                 Word.Document documentObject =applicationObject.Documents.Open(ref fileName, ref missing, ref missing, ref missing,
                          ref missing, ref missing, ref missing, ref missing, ref missing,
                          ref missing, ref missing, ref False, ref missing, ref missing,
                           ref missing, ref missing);

                 object tempFileName =@"F:\Code\DisplayPrintfile\DisplayPrintfile\file\tempHtm.html";
                 object fileFormt = Word.WdSaveFormat.wdFormatHTML;
                 object makeFalse = false;
                 object makeTrue = true;
                 string absolutePath = tempFileName.ToString();
                 if (File.Exists(absolutePath))
                 {
                     try
                     {
                         File.Delete(absolutePath);
                     }
                     catch { }
                 }

                 documentObject.SaveAs(ref tempFileName, ref fileFormt,
                    ref makeFalse, ref missing, ref makeFalse,
                    ref missing, ref missing, ref missing, ref makeFalse, ref missing, ref missing,
                    ref missing, ref missing, ref missing, ref missing, ref missing);
                 GC.Collect();
                 GC.WaitForPendingFinalizers();
                 documentObject.Close(ref makeFalse, ref missing, ref missing);
                 GC.Collect();
                 GC.WaitForPendingFinalizers();
                 //File.Delete(rtfText);

                 String htmlCode = "";

                 //Extract html source from the temporary html file.
                 if (File.Exists(absolutePath))
                 {
                     WebClient client = new WebClient();
                     htmlCode = client.DownloadString(absolutePath);
                     GC.Collect();
                     GC.WaitForPendingFinalizers();
                     try
                     {
                         File.Delete(absolutePath);
                     }
                     catch { }
                 }

                 else
                 {
                     htmlCode = "";
                 }

                 return htmlCode;
             }
             catch
             {
                 return "";
             }
         }

demo: 下载