TurnContext Respond 如何使用 Waterfalldialogs 工作？

我的 TaskOnTurn 方法有问题。当我启动机器人时，它会发送欢迎消息并启动一个新的对话框，因为

if(!turnContext.Responded)

现在，当我在对话框中时，它会再次跳到最后一个 if 语句，并且当我已经在一个对话框中时，会启动一个新对话框。 !turnContext.Responded 如何工作？ 然后我尝试启动对话框 if (turnContext.Activity.MembersAdded != null) 在等待SendWecomeMessage 下。那行不通。然后，它发送 1 条欢迎消息，然后启动 2 个对话。这也让我很困惑。

public async Task OnTurnAsync(ITurnContext turnContext, CancellationToken cancellationToken = default(CancellationToken))
        {
            if (turnContext == null)
            {
                throw new ArgumentNullException(nameof(turnContext));
            }

            var activity = turnContext.Activity;
            var dc = await _dialogs.CreateContextAsync(turnContext, cancellationToken);
            if (turnContext.Activity.Type == ActivityTypes.Message)
            {
                await dc.ContinueDialogAsync(cancellationToken);
            }
            else if (turnContext.Activity.Type == ActivityTypes.ConversationUpdate)
            {
                if (turnContext.Activity.MembersAdded != null)
                {
                    await SendWelcomeMessageAsync(turnContext, cancellationToken);
                }
            }
            else
            {
                await turnContext.SendActivityAsync($"{turnContext.Activity.Type} event detected", cancellationToken: cancellationToken);
            }

            if (!turnContext.Responded)
            {
                await dc.BeginDialogAsync(ReservationDialog, cancellationToken);
            }
        }

TurnContext.Responded https://learn.microsoft.com/en-us/dotnet/api/microsoft.bot.builder.turncontext.responded?view=botbuilder-dotnet-stable#Microsoft_Bot_Builder_TurnContext_Responded指示当前回合是否至少发送了一个响应。OnTurnAsync在每个瀑布步骤之间触发，所以如果ReservationDialog有提示，一旦用户回答提示，OnTurnAsync被解雇，并且由于机器人尚未在该 StepContext 内做出响应，TurnContext.Responded is false。这就是为什么你会在另一个对话框中间看到一个对话框。

您可以选择很多不同的路线OnTurnAsync。我绝对推荐 检查一些样品 https://github.com/Microsoft/BotBuilder-Samples/tree/master/samples/csharp_dotnetcore看看他们是如何做事的——他们中的大多数都得到了很好的评论。

public async Task OnTurnAsync(ITurnContext turnContext, CancellationToken cancellationToken = default(CancellationToken))
{
    var activity = turnContext.Activity;

    var dc = await Dialogs.CreateContextAsync(turnContext);

    // Execute on incoming messages
    if (activity.Type == ActivityTypes.Message)
    {
        if (string.IsNullOrWhiteSpace(activity.Text) && activity.Value != null)
        {
            activity.Text = JsonConvert.SerializeObject(activity.Value);
        }
    }

    var dialogResult = await dc.ContinueDialogAsync();

    // Execute based on different situations within a Dialog. See BasicBot for examples:
    // https://github.com/Microsoft/BotBuilder-Samples/blob/master/samples/csharp_dotnetcore/13.basic-bot/BasicBot.cs#L112
    if (!dc.Context.Responded)
    {
        switch (dialogResult.Status)
        {
            case DialogTurnStatus.Empty:
            case DialogTurnStatus.Waiting:
                break;
            case DialogTurnStatus.Complete:
                await dc.EndDialogAsync();
                break;
            default:
                await dc.CancelAllDialogsAsync();
                break;

        }
    }

    // Here's where we show welcome messages
    if (activity.Type == ActivityTypes.ConversationUpdate)
    {
        if (activity.MembersAdded != null)
        {
            foreach (var member in activity.MembersAdded)
            {
                // This makes sure the new user isn't the bot. It's a little different from some of the samples
                // because code has changed in the SDK and emulator
                if (member.Name != "Bot" && member.Name != null)
                {
                    await SendWelcomeMessageAsync(turnContext, cancellationToken);
                    await dc.BeginDialogAsync(ReservationDialog, cancellationToken);
                }
            }
        }
    }

    // Be sure you're saving ConversationState at the end since DialogContext derives from it
    await _conversationState.SaveChangesAsync(turnContext);
}