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

        private Stream OpenInUpdateMode()
        {
            if (_currentlyOpenForWrite)
                throw new IOException(SR.UpdateModeOneStream);

            ThrowIfNotOpenable(true, true);

            _everOpenedForWrite = true;
            _currentlyOpenForWrite = true;
            //always put it at the beginning for them
            UncompressedData.Seek(0, SeekOrigin.Begin);
            return new WrappedStream(UncompressedData, this, thisRef =>
            {
                //once they close, we know uncompressed length, but still not compressed length
                //so we don't fill in any size information
                //those fields get figured out when we call GetCompressor as we write it to
                //the actual archive
                thisRef._currentlyOpenForWrite = false;
            });
        }