System.Diagnostics.AsyncStreamReader.BeginReadLine C# (CSharp) Method

        internal void BeginReadLine() {
            if( cancelOperation) {
                cancelOperation = false;
            }
            
            if( sb == null ) {
                sb = new StringBuilder(DefaultBufferSize);
                stream.BeginRead(byteBuffer, 0 , byteBuffer.Length,  new AsyncCallback(ReadBuffer), null);
            }
            else {
                FlushMessageQueue();
            }
        }

        /// <devdoc>
        /// <para>
        /// Instructs the <see cref='System.Diagnostics.Process'/> component to start
        /// reading the StandardError stream asynchronously. The user can register a callback
        /// that will be called when a line of data terminated by \n,\r or \r\n is reached, or the end of stream is reached
        /// then the remaining information is returned. The user can add an event handler to ErrorDataReceived.
        /// </para>
        /// </devdoc>
        public void BeginErrorReadLine()
        {
            if (_errorStreamReadMode == StreamReadMode.Undefined)
            {
                _errorStreamReadMode = StreamReadMode.AsyncMode;
            }
            else if (_errorStreamReadMode != StreamReadMode.AsyncMode)
            {
                throw new InvalidOperationException(SR.CantMixSyncAsyncOperation);
            }

            if (_pendingErrorRead)
            {
                throw new InvalidOperationException(SR.PendingAsyncOperation);
            }

            _pendingErrorRead = true;
            // We can't detect if there's a pending synchronous read, stream also doesn't.
            if (_error == null)
            {
                if (_standardError == null)
                {
                    throw new InvalidOperationException(SR.CantGetStandardError);
                }

                Stream s = _standardError.BaseStream;
                _error = new AsyncStreamReader(s, ErrorReadNotifyUser, _standardError.CurrentEncoding);
            }
            _error.BeginReadLine();
        }