System.IO.Compression.ZipStorer.AddFile C# (CSharp) Méthode

        public void AddFile(Compression _method, string _pathname, string _filenameInZip, string _comment, ushort access = 0x8100)
        {
            if (Access == FileAccess.Read)
                throw new InvalidOperationException("Writing is not alowed");

            FileStream stream = new FileStream(_pathname, FileMode.Open, FileAccess.Read);
            AddStream(_method, _filenameInZip, stream, File.GetLastWriteTime(_pathname), _comment, access);
            stream.Close();
        }

        /// <summary>
        /// Removes one of many files in storage. It creates a new Zip file.
        /// </summary>
        /// <param name="_zip">Reference to the current Zip object</param>
        /// <param name="_zfes">List of Entries to remove from storage</param>
        /// <returns>True if success, false if not</returns>
        /// <remarks>This method only works for storage of type FileStream</remarks>
        public static bool RemoveEntries(ref ZipStorer _zip, List <ZipFileEntry> _zfes)
        {
            if (!(_zip.ZipFileStream is FileStream))
            {
                throw new InvalidOperationException("RemoveEntries is allowed just over streams of type FileStream");
            }


            //Get full list of entries
            List <ZipFileEntry> fullList = _zip.ReadCentralDir();

            //In order to delete we need to create a copy of the zip file excluding the selected items
            string tempZipName   = Path.GetTempFileName();
            string tempEntryName = Path.GetTempFileName();

            try
            {
                ZipStorer tempZip = ZipStorer.Create(tempZipName, string.Empty);

                foreach (ZipFileEntry zfe in fullList)
                {
                    if (!_zfes.Contains(zfe))
                    {
                        if (_zip.ExtractFile(zfe, tempEntryName))
                        {
                            tempZip.AddFile(zfe.Method, tempEntryName, zfe.FilenameInZip, zfe.Comment);
                        }
                    }
                }
                _zip.Close();
                tempZip.Close();

                File.Delete(_zip.FileName);
                File.Move(tempZipName, _zip.FileName);

                _zip = ZipStorer.Open(_zip.FileName, _zip.Access);
            }
            catch
            {
                return(false);
            }
            finally
            {
                if (File.Exists(tempZipName))
                {
                    File.Delete(tempZipName);
                }
                if (File.Exists(tempEntryName))
                {
                    File.Delete(tempEntryName);
                }
            }
            return(true);
        }