System.Net.FtpDataStream.ICloseEx C# (CSharp) Метод

        void ICloseEx.CloseEx(CloseExState closeState)
        {
            if (NetEventSource.IsEnabled) NetEventSource.Info(this, $"state = {closeState}");

            lock (this)
            {
                if (_closing == true)
                    return;
                _closing = true;
                _writeable = false;
                _readable = false;
            }

            try
            {
                try
                {
                    if ((closeState & CloseExState.Abort) == 0)
                        _networkStream.Close(DefaultCloseTimeout);
                    else
                        _networkStream.Close(0);
                }
                finally
                {
                    _request.DataStreamClosed(closeState);
                }
            }
            catch (Exception exception)
            {
                bool doThrow = true;
                WebException webException = exception as WebException;
                if (webException != null)
                {
                    FtpWebResponse response = webException.Response as FtpWebResponse;
                    if (response != null)
                    {
                        if (!_isFullyRead
                            && response.StatusCode == FtpStatusCode.ConnectionClosed)
                            doThrow = false;
                    }
                }

                if (doThrow)
                    if ((closeState & CloseExState.Silent) == 0)
                        throw;
            }
        }