private void AddToZipStream(byte[] inputStream,ZipOutputStream zipStream,string fileName,string fileExtension)
    {
        var courseName = RemoveSpecialCharacters(fileName);

        var m_Bytes = inputStream;
        if ((m_Bytes != null) && (zipStream != null))
        {
            var newEntry = new ZipEntry(ZipEntry.CleanName(string.Concat(courseName,fileExtension)));
            newEntry.DateTime = DateTime.Now;
            newEntry.Size = m_Bytes.Length;

            zipStream.PutNextEntry(newEntry);
            zipStream.Write(m_Bytes,m_Bytes.Length);
            zipStream.CloseEntry();
            zipStream.UseZip64 = UseZip64.Off;
        }
    }

如何使用ZipEntry创建目录,然后如何将文件添加到Zip存档内的目录？