System.IO.Compression.ZipArchiveEntry.OpenInWriteMode C# (CSharp) Méthode

        private Stream OpenInWriteMode()
        {
            if (_everOpenedForWrite)
                throw new IOException(SR.CreateModeWriteOnceAndOneEntryAtATime);

            //we assume that if another entry grabbed the archive stream, that it set this entry's _everOpenedForWrite property to true by calling WriteLocalFileHeaderIfNeeed
            Debug.Assert(_archive.IsStillArchiveStreamOwner(this));

            _everOpenedForWrite = true;
            CheckSumAndSizeWriteStream crcSizeStream = GetDataCompressor(_archive.ArchiveStream, true,
                                                            (object o, EventArgs e) =>
                                                            {
                                                                //release the archive stream
                                                                var entry = (ZipArchiveEntry)o;
                                                                entry._archive.ReleaseArchiveStream(entry);
                                                                entry._outstandingWriteStream = null;
                                                            });
            _outstandingWriteStream = new DirectToArchiveWriterStream(crcSizeStream, this);

            return new WrappedStream(baseStream: _outstandingWriteStream, closeBaseStream: true);
        }