System.Net.Sockets.NetworkStream.UnsafeBeginRead C# (CSharp) Метод

        internal virtual IAsyncResult UnsafeBeginRead(byte[] buffer, int offset, int size, AsyncCallback callback, Object state)
        {
            bool canRead = CanRead; // Prevent race with Dispose.
            if (_cleanedUp)
            {
                throw new ObjectDisposedException(GetType().FullName);
            }
            if (!canRead)
            {
                throw new InvalidOperationException(SR.net_writeonlystream);
            }

            Socket chkStreamSocket = _streamSocket;
            if (chkStreamSocket == null)
            {
                throw new IOException(SR.Format(SR.net_io_readfailure, SR.net_io_connectionclosed));
            }

            try
            {
                IAsyncResult asyncResult = chkStreamSocket.UnsafeBeginReceive(
                    buffer,
                    offset,
                    size,
                    SocketFlags.None,
                    callback,
                    state);

                return asyncResult;
            }
            catch (Exception exception)
            {
                if (ExceptionCheck.IsFatal(exception)) throw;

                // Some sort of error occurred on the socket call,
                // set the SocketException as InnerException and throw.
                throw new IOException(SR.Format(SR.net_io_readfailure, exception.Message), exception);
            }
        }