Bot框架v4.0如何在对话框中执行上一个瀑布步骤

Question

我正在尝试创建一个对话框,在其中我定义了多个瀑布步骤.在此对话框的上下文中,我有时需要根据用户的选择返回上一个瀑布步骤.我找到了这个方法:

 await stepContext.ReplaceDialogAsync("Name of the dialog");

但是,这个方法重新执行整个对话框,这不是我需要的.

事实上,我创建的瀑布步骤有三个:

• ChoiceCallStepAsync:第一步将列出用户的前10个调用以及显示旧步骤的选项
• ShowCallStepAsync:第二步将显示用户选择的呼叫,如果用户点击"显示较旧",则返回第一步
• EndDialog:第三步将终止对话框

我的代码是:

public class ListAllCallsDialog : ComponentDialog
    {

        // Dialog IDs
        private const string ProfileDialog = "ListAllCallsDialog";



        /// <summary>
        /// Initializes a new instance of the <see cref="ListAllCallsDialog"/> class.
        /// </summary>
        /// <param name="loggerFactory">The <see cref="ILoggerFactory"/> that enables logging and tracing.</param>
        public ListAllCallsDialog(ILoggerFactory loggerFactory)
            : base(nameof(ListAllCallsDialog))
        {
            // Add control flow dialogs
            var waterfallSteps = new WaterfallStep[]
            {
                   ListAllCallsDialogSteps.ChoiceCallStepAsync,
                   ListAllCallsDialogSteps.ShowCallStepAsync,
                   ListAllCallsDialogSteps.EndDialog,
            };
            AddDialog(new WaterfallDialog(ProfileDialog, waterfallSteps));
            AddDialog(new ChoicePrompt("cardPrompt"));
        }

        /// <summary>
        /// Contains the waterfall dialog steps for the main dialog.
        /// </summary>
        private static class ListAllCallsDialogSteps
        {
            static int callListDepth = 0;
            static List<string> Calls;
            public static async Task<DialogTurnResult> ChoiceCallStepAsync(WaterfallStepContext stepContext, CancellationToken cancellationToken)
            {
                await stepContext.Context.SendActivityAsync(
                   "Right now i'm in list all calls dialog",
                   cancellationToken: cancellationToken);
                GetAllCalls();
                return await stepContext.PromptAsync("cardPrompt", GenerateOptions(stepContext.Context.Activity, callListDepth), cancellationToken);
            }

            public static async Task<DialogTurnResult> ShowCallStepAsync(WaterfallStepContext stepContext, CancellationToken cancellationToken)
            {
                // Get the text from the activity to use to show the correct card
                var text = stepContext.Context.Activity.Text.ToLowerInvariant();
                if(text == "Show older")
                    //Go back to the first step
                else if(text == "Show earlier")
                    //Go back to the first step
                else
                    await stepContext.Context.SendActivityAsync(
                   "The call you choose is : " + text.ToString(),
                   cancellationToken: cancellationToken);
                   return await stepContext.ContinueDialogAsync();

            }

            public static async Task<DialogTurnResult> EndDialog(WaterfallStepContext stepContext, CancellationToken cancellationToken)
            {
                await stepContext.Context.SendActivityAsync(
               "Getting back to the parent Dialog",
               cancellationToken: cancellationToken);
                return await stepContext.EndDialogAsync(null, cancellationToken);
            }

            /// <summary>
            /// Creates options for a <see cref="ChoicePrompt"/> so the user may select an option.
            /// </summary>
            /// <param name="activity">The message activity the bot received.</param>
            /// <returns>A <see cref="PromptOptions"/> to be used in a prompt.</returns>
            /// <remarks>Related type <see cref="Choice"/>.</remarks>
            private static PromptOptions GenerateOptions(Activity activity, int callListDepth)
            {
                // Create options for the prompt
                var options = new PromptOptions()
                {
                    Prompt = activity.CreateReply("Please choose a call from the list below"),
                    Choices = new List<Choice>(),
                };


                for(int i=10*callListDepth; i <= 10 * (callListDepth + 1); i++)
                {
                    if (Calls.ElementAtOrDefault(i) != null)
                      options.Choices.Add(new Choice() { Value = Calls[i] });

                }
                options.Choices.Add(new Choice() { Value = "Show older" });
                if(callListDepth!=0)
                    options.Choices.Add(new Choice() { Value = "Show earlier" });
                return options;
            }
            private static void GetAllCalls()
            {

                //List of all calls found
                for (int i = 0; i < 30; i++)
                  Calls.Add("Call" + i.ToString());
            }

        }

}

有人能告诉我怎么做吗,拜托？

Answer 1

我不确定,如果这是正确而有效的方法,但你可以试验你的功能内的State属性.context.ActiveDialogTask<DialogTurnResult>

context.ActiveDialog.State["stepIndex"] = (int)context.ActiveDialog.State["stepIndex"] -2;

Answer 2

瀑布对话框的设计并没有考虑“向后”遍历它们的想法，尽管我可以看到可能需要这样做。我发现的唯一解决方案是将瀑布分成较小的“迷你”瀑布，并将它们嵌套到一个较大的瀑布中。

        // define and add waterfall dialogs (main)
        WaterfallStep[] welcomeDialogSteps = new WaterfallStep[]
        {
            MainDialogSteps.PresentMenuAsync,
            MainDialogSteps.ProcessInputAsync,
            MainDialogSteps.RepeatMenuAsync,
        };

然后在 MainDialogSteps.ProcessInputAsync 中：

        public static async Task<DialogTurnResult> ProcessInputAsync(
            WaterfallStepContext stepContext,
            CancellationToken cancellationToken)
        {
            var choice = (FoundChoice)stepContext.Result;
            var dialogId = Lists.WelcomeOptions[choice.Index].DialogName;

            return await stepContext.BeginDialogAsync(dialogId, null, cancellationToken);
        }

这允许用户仍然在主对话框堆栈中启动新对话框。我提供的选项之一是提示电话号码列表：

        WaterfallStep[] phoneChoiceDialogSteps = new WaterfallStep[]
        {
            PhoneChoicePromptSteps.PromptForPhoneAsync,
            PhoneChoicePromptSteps.ConfirmPhoneAsync,
            PhoneChoicePromptSteps.ProcessInputAsync,
        };

        Add(new WaterfallDialog(Dialogs.PhonePrompt, phoneChoiceDialogSteps));

最后，在 PhoneChoicePromptSteps.ProcessInputAsync 中，我允许从确认到 ReplaceDialogAsync 中选择“否”，并有效地重置这个较小的瀑布，而不影响整个瀑布的其余部分：

 public static async Task<DialogTurnResult> ProcessInputAsync(
            WaterfallStepContext stepContext,
            CancellationToken cancellationToken)
        {
            if ((bool)stepContext.Result)
            {
                await stepContext.Context.SendActivityAsync(
                    $"Calling {stepContext.Values[Outputs.PhoneNumber]}",
                    cancellationToken: cancellationToken);
                return await stepContext.EndDialogAsync(null, cancellationToken);
            }
            else
            {
                return await stepContext.ReplaceDialogAsync(Dialogs.PhonePrompt, null, cancellationToken);
            } 
        }