New files not added to archive, when i update it

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0

I use simple c# code for update archive:

        using (var zip = ZipFile.Open(archive, ZipArchiveMode.Update, Encoding.UTF8))
    {
      var directories = new DirectoryInfo(folder);
      var files = directories
        .GetFiles("*", SearchOption.TopDirectoryOnly)
        .Select(f => f.FullName)
        .Except(directories
            .GetFiles(ArchivePattern, SearchOption.TopDirectoryOnly)
            .Select(f => f.FullName));
      foreach (var file in files)
      {
        var fileName = file
          .Replace(directories.FullName + Path.DirectorySeparatorChar, string.Empty)
          .Replace(directories.FullName, string.Empty);
        var fileInZip = zip.Entries.FirstOrDefault(f => f.FullName == fileName);
        if (fileInZip != null)
          fileInZip.Delete();
        zip.CreateEntryFromFile(file, fileName, CompressionLevel.NoCompression);
      }
    }

But, another user say, he lost all new files (all packed files deleted after this code). And in archive only old files.

I dont have any idea, when i lost files. Want any idea, how to improve code or what library\methods can help with this.

asked 12 secs ago

Monk

1

New files not added to archive, when i update it