如何在现有文档中插入封面和分页符？

如何解决如何在现有文档中插入封面和分页符？

我要做的任务是将封面文字文档的内容插入到一组现有的文字文档中。现有文档全部位于ToBeProcessed文件夹中，封面存储在其自己的文件夹中。我创建的过程是将封面的内容存储为字符串，然后遍历打开每个文件的现有文件列表，使用范围选择文档的开头，插入文本，然后添加分页符。>

到目前为止，除了分页符被插入到封面页面内容之前的事实之外，一切都按预期进行。有人可以建议如何实现吗？万一有人有以更有效的方式获得相同结果的经验，我已经包含了程序的全部内容，但是从我的研究来看，使用范围似乎是最佳实践。

        const string COVERING_FOLDER = @"C:\Users\alex.grimsley1\Documents\DocmanLetters\CoveringPage";
        const string COMPLETE_FOLDER = @"C:\Users\alex.grimsley1\Documents\DocmanLetters\Complete";
        const string LOG_FOLDER = @"C:\Users\alex.grimsley1\Documents\DocmanLetters\Log";

        static void Main(string[] args)
        {
            Console.WriteLine(DateTime.Now.ToString("dd_MM_yyyy_hh_mm_ss"));
            StreamWriter logfile = new StreamWriter(LOG_FOLDER + @"\Log_" + DateTime.Now.ToString("dd_MM_yyyy_hh_mm_ss") + @".txt");
            
            //Returns an array of strings which contains the list of filenames to be edited
            var files = Directory.GetFiles(PROCESSING_FOLDER);

            //Creates a new Application wrapper
            Application ap = new Application();

            //Open the Covering Page document
            var cp = ap.Documents.Open(COVERING_FOLDER + "\\CoveringPage.docx");

            //Copy the Covering Page contents to a variable for later use
            var cpContent = cp.Content.Text;

            //Close the Covering Page document
            cp.Close(WdSaveOptions.wdDoNotSaveChanges);

            //Loop through the file list
            foreach(var file in files)
            {
                if(file.Substring(0,PROCESSING_FOLDER.Length + 1) == PROCESSING_FOLDER + "~")
                {
                    Console.WriteLine("Skipping temporary file: " + file);
                } else
                {
                    try
                    {
                        object missing = System.Type.Missing;
                        
                        //Open each file using the Application wrapper
                        var d = ap.Documents.Open(file);
                        ap.Visible = true;
                        var dName = d.Name;

                        //Select a range at the very start of the Document
                        var rng = d.Range(0,0);
                        d.Unprotect();
                        d.Protect(WdProtectionType.wdNoProtection);

                        //Add covering page text to the Document
                        rng.Text = cpContent;
                        rng.Collapse(WdCollapseDirection.wdCollapseEnd);
                        rng.InsertBreak(WdBreakType.wdPageBreak);

                        //Write the Document name to the Console
                        Console.WriteLine(d.Name);

                        //Save the document in place
                        d.Save();

                        //Close the document
                        d.Close(WdSaveOptions.wdDoNotSaveChanges);

                        //Move the file to the Complete folder
                        File.Move(file,COMPLETE_FOLDER + "\\" + dName);

                        //Log the completion of the letter
                        logfile.WriteLine("Complete " + DateTime.Now.ToString() + " - " + d.Name);
                    }
                    catch(Exception e)
                    {
                        Console.WriteLine("There was an error: " + e.Message);

                        //Log the completion of the letter
                        logfile.WriteLine("Error " + DateTime.Now.ToString() + " - " + e.Message);
                    }
                    finally
                    {
                        // Close Word application
                        ap.Quit();
                        Marshal.ReleaseComObject(ap);
                        ap = null;
                        GC.Collect();
                        GC.WaitForPendingFinalizers();
                        GC.Collect();
                        GC.WaitForPendingFinalizers();
                    }
                }
                           
            }

            
            Console.WriteLine("Processing complete...");
            Console.ReadLine();

        }```