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我有两个瀑布对话框，步骤如下：

主对话框

    private async Task<DialogTurnResult> LoginStepAsync(WaterfallStepContext stepContext, CancellationToken cancellationToken)
    {
        return await stepContext.BeginDialogAsync(nameof(LoginDialog), cancellationToken: cancellationToken);
    }

    private async Task<DialogTurnResult> IntroStepAsync(WaterfallStepContext stepContext, CancellationToken cancellationToken)
    {
        return await stepContext.BeginDialogAsync(nameof(QnADialog), stepContext.Options, cancellationToken);
    }

    private async Task<DialogTurnResult> FinalStepAsync(WaterfallStepContext stepContext, CancellationToken cancellationToken)
    {
        return await stepContext.EndDialogAsync(null, cancellationToken);
    }

QnA对话框

private async Task<DialogTurnResult> WelcomeStepAsync(WaterfallStepContext stepContext, CancellationToken cancellationToken)
    {
        Options = (QnADialogOptions)stepContext.Options;

        if (Options.IsProactive)
        {
            await stepContext.Context.SendActivityAsync(MessageFactory.Text("What I want to happend when I send a proactive message"), cancellationToken);

            return await stepContext.PromptAsync($"{nameof(QnADialog)}.addAnswer"),
                   new PromptOptions
                   {
                       Prompt = MessageFactory.Text("Do you want to add the answer for the question?"),
                       Choices = ChoiceFactory.ToChoices(new List<string> { "Yes", "No" })
                   }, cancellationToken);
        }
        else
        {
            return await stepContext.PromptAsync($"{nameof(QnADialog)}.welcome",
            new PromptOptions
            {
            }, cancellationToken);
        }

    }

    private async Task<DialogTurnResult> QnAStepAsync(WaterfallStepContext stepContext, CancellationToken cancellationToken)
    {
        if (Options.IsProactive)
        {
            if (stepContext.Result.Equals("Yes")) 
            {
                await stepContext.Context.SendActivityAsync(MessageFactory.Text("test"), cancellationToken);
                return await stepContext.EndDialogAsync($"{nameof(QnADialog)}.mainFlow");
            }
            else
            {
                return await stepContext.EndDialogAsync($"{nameof(QnADialog)}.mainFlow");
            }
        }
        else
        {
            //search and display the answer
        }
    }

    private async Task<DialogTurnResult> AddAnswerStepAsync(WaterfallStepContext stepContext, CancellationToken cancellationToken)
    {
        //if no answer was found, send proactive message to another user
    }

这是主动回调：

        private async Task BotCallback(ITurnContext turnContext, CancellationToken cancellationToken)
    {
        await turnContext.SendActivityAsync(message);

        var dialog = new DialogSet(_stateService.DialogStateAccessor);
        dialog.Add(new MainDialog(_logger,_stateService,_botServices,_configuration,_conversationReferences));
        var dc = await dialog.CreateContextAsync(turnContext);

        await dc.BeginDialogAsync(nameof(MainDialog), new QnADialogOptions(default, message, true),cancellationToken);
    }

我向用户发送主动消息，我想检索他们的答案。但是在我要求用户提示他是否要添加答案后，对话就结束了。这是一个屏幕截图。 我希望我的对话框等待输入，然后转到下一个瀑布步骤。我怎样才能做到这一点？

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