bool result = false;
            WdExportFormat exportFormat = WdExportFormat.wdExportFormatPDF;
            ApplicationClass app = null;
            Document doc = null;
            try
            {
                app = new ApplicationClass();
                app.Visible = false;
                doc = app.Documents.Open(@"D:\1.doc");
                doc.SaveAs();
                doc.ExportAsFixedFormat(@"D:\1.pdf", exportFormat);
                result = true;

======================

就在执行app = new ApplicationClass()时，总是跳出office的安装程序，代码也停住了，虽然强制关掉安装窗口，代码仍能正常进行，但为什么会跳出安装窗口？？？