c# - Bot framework 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，在其中定义多个瀑布步骤。在此对话框的上下文中，有时我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，此方法重新执行整个对话框，这不是我需要的。

事实上，我创建的瀑布步骤是三个：

• ChoiceCallStepAsync：第一步将列出用户的前 10 个调用，并带有显示较旧步骤的选项
• ShowCallStepAsync：第二步将显示用户选择的呼叫，如果用户单击“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());
            }

        }

}

有人可以告诉我怎么做吗？

标签： c#botframeworkwaterfall

Answer 1

我不确定这是否是正确且有效的方法，但您可以在函数内试验该State属性。context.ActiveDialogTask<DialogTurnResult>

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