private async void OnConversationUpdated()

in blog-samples/CSharp/TriviaBotSpeechSample/TriviaApp/MainPage.xaml.cs [202:290]
72 lines of code
14 McCabe index (conditional complexity)

        private async void OnConversationUpdated(object sender, Activity e) => await RunOnUi(() =>
        {
            var appEntities = (AppEntities)null;

            // Don't do anything for messages this client sent
            if (e.From.Id == _botClient.ClientID)
            {
                return;
            }

            if (e.Entities != null)
            {
                appEntities =
                    (from entity in e.Entities
                     where entity.Type == "AppEntities"
                     select entity).FirstOrDefault()?.GetAs<AppEntities>();

                if (appEntities != null)
                {
                    // Parse message type
                    if (appEntities.MessageType != null)
                    {
                        var messageType = appEntities.MessageType;

                        _model["ShowGotItRight"] = false;
                        _model["ShowGotItWrong"] = false;

                        if (messageType != MessageType.Question)
                        {
                            _answerCards.Clear();
                            UpdateAnswerCards();
                            _countdownTimer.Reset();
                            _model["RemainingTime"] = "∞";

                            switch (messageType)
                            {
                                case MessageType.Statement:
                                    break;
                                case MessageType.GotItRight:
                                    ++_rightAnswers;
                                    _model["Score1"] = _rightAnswers;
                                    _model["ShowGotItRight"] = true;
                                    break;
                                case MessageType.GotItWrong:
                                    ++_wrongAnswers;
                                    _model["Score0"] = _wrongAnswers;
                                    _model["ShowGotItWrong"] = true;
                                    break;
                                case MessageType.StartLightningMode:
                                    _lightningMode = true;
                                    break;
                                case MessageType.StopLightningMode:
                                    _lightningMode = false;
                                    break;
                            }
                        }
                    }
                }
            }

            if (!string.IsNullOrEmpty(e.Text))
            {
                var choicesMessage = string.Empty;

                // Parse choices
                if (appEntities?.MessageType == MessageType.Question)
                {
                    // We've received a question from the bot. Tell the bot client that the user is likely to say one of
                    // these options, so it can specifically listen for them (supported in the Microsoft.Bot.Client.Universal.WindowsMediaSpeechRecognizer)
                    _botClient.ListenFor(appEntities.TriviaAnswerOptions);

                    _answerCards.Clear();
                    var index = 1;
                    foreach (var option in appEntities.TriviaAnswerOptions ?? Enumerable.Empty<string>())
                    {
                        _answerCards.Add(new AnswerCard { Index = $"{index}.", AnswerText = $" {option}" });
                        choicesMessage += $"\n    {index}. {option}";
                        ++index;
                    }
                    UpdateAnswerCards();

                    _startCountdownTimer = true;
                }

                _model["LastBotMessage"] = e.Text;

                AddChatMessage(MessageSource.Bot, e.Text + choicesMessage);
            }
        });