c# - File.OpenWrite 后损坏的 MS Word/Excel 文件

Question

如果 ContentLength 不匹配，我正在尝试以编程方式在共享驱动器上更新或创建 MS Word 或 Excel 文件。该文件最初存储在 Sharepoint 数据库中。当文件写入本地目录时，我能够成功执行此操作，但是，当对网络驱动器上的文件执行此操作时，即使文件被重写，内容也会损坏并且无法正确打开。

我不确定问题是否出在WriteFile()并且有更好的方法来创建或更新 Excel/Word 文件，而不是使用File.Write和file.OpenWrite

我的代码如下：

public void UpsertSharepointFiles()
        {
            try
            {



  var spList = GetSharepointDirectories();

            var targetDir = @"\\111.111.0.11\c$\websites\XXX\FormLibrary";

            IntPtr token = IntPtr.Zero;
            bool valid = LogonUser("administrator",
                        "XXX",
                        "XXX",
                        (int)LogonType.NewCredentials,
                        (int)LogonProvider.WinNT50,
                        ref token);

            if (valid)
            {

                using (WindowsImpersonationContext context = WindowsIdentity.Impersonate(token))
                {

                    CloseHandle(token);

                    //var targetDir = Server.MapPath("~/TempCopy");
                    //var targetDir = @"\\\\222.222.2.22\c$\websites\XXX\FormLibrary";
                    var targetDirInfo = new DirectoryInfo(targetDir);

                    var dirs = targetDirInfo.GetDirectories("*.*", SearchOption.AllDirectories);

                    if (spList != null)
                    {

                        foreach (var spFile in spList)
                        {
                            if (spFile.Content != null)
                            {
                                foreach (var dir in dirs)
                                {
                                    var searchFile = dir.GetFiles(spFile.LeafName);
                                    var currDirName = dir.Name;

                                    if (currDirName == "ABBH")
                                    {
                                        currDirName = "ABB";
                                    }

                                    if (searchFile.Count() == 0) //Web Server - No, SP - Yes
                                    {
                                        CreateFileOnWebServer(currDirName, spFile, targetDir);
                                    }
                                    else // Web Server - Yes, SP - Yes
                                    {
                                        UpdateFileOnWebServer(searchFile, spFile, targetDir, currDirName);
                                    }
                                }

                            }
                        }

                        foreach (var dir in dirs)
                        {
                            DeleteFilesOnWebServerNotInSharepointDb(dir, spList);
                        }
                    }
                }

                lblSuccessMessage.Text = "Forms Library in Website successfully synced with Sharepoint Forms Library!";
                lblSuccessMessage.Visible = true;
            }
        }
        catch (Exception)
        {
            lblErrorMessage.Text = "Error occurred when syncing Forms Library in Website.  Please try again.";
            lblErrorMessage.Visible = true;
        }

    }

private static void DeleteFilesOnWebServerNotInSharepointDb(DirectoryInfo dir, List<SharepointVO> spList)
        {
            var dirFileList = dir.GetFiles();

            var filesOnServerNotInSharepointDb = dirFileList.Where(w => spList.All(s => s.LeafName != w.Name));
            foreach (var file in filesOnServerNotInSharepointDb)
            {
                var fInfo = new FileInfo(file.DirectoryName + @"\" + file.Name).ToString();
                System.IO.File.Delete(fInfo);
            }
        }

        private static void UpdateFileOnWebServer(FileInfo[] searchFile, SharepointVO spFile, string targetDir,
            string currDirName)
        {
            if (searchFile[0].Directory.Name == spFile.Directory)
            {
                // Replace file with Sharepoint file
                if (spFile.ContentLength != searchFile[0].Length) //Checks only first file
                {
                    WriteFile(currDirName, spFile, targetDir);
                }
            }
        }

        private static void CreateFileOnWebServer(string currDirName, SharepointVO spFile, string targetDir)
        {
            if (currDirName == spFile.Directory)
            {
                // Check if directory exists on server
                if (Directory.Exists(targetDir + "/" + currDirName))
                {
                    {
                        {
                            WriteFile(currDirName, spFile, targetDir);
                        }
                    }
                }
                else
                {
                    Directory.CreateDirectory(targetDir + "/" + currDirName);

                    WriteFile(currDirName, spFile, targetDir);
                }
            }
        }

        private static void WriteFile(string currDirName, SharepointVO spFile, string targetDir)
        {
            using (
                Stream fs =
                    System.IO.File.OpenWrite(targetDir + "/" + currDirName + "/" + spFile.LeafName))
            {
                fs.Write(spFile.Content, 0, spFile.Content.Length);
            }
        }

        [DllImport("advapi32.dll", SetLastError = true)]
        public static extern bool LogonUser(string lpszUsername, string lpszDomain, string lpszPassword, int dwLogonType, int dwLogonProvider, ref IntPtr phToken);

        [DllImport("kernel32.dll")]
        public static extern bool CloseHandle(IntPtr token);

        enum LogonType
        {
            Interactive = 2,
            Network = 3,
            Batch = 4,
            Service = 5,
            Unlock = 7,
            NetworkClearText = 8,
            NewCredentials = 9
        }

        enum LogonProvider
        {
            Default = 0,
            WinNT35 = 1,
            WinNT40 = 2,
            WinNT50 = 3
        }