ToDo Bot | Part 1 | Setup the Development Environment | Microsoft Bot Framework

// Register the BookingDialog.
services.AddSingleton<BookingDialog>();

// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License.
//
// Generated with Bot Builder V4 SDK Template for Visual Studio CoreBot v4.11.1

using Microsoft.Bot.Builder;
using Microsoft.Bot.Builder.Dialogs;
using Microsoft.Bot.Schema;
using Microsoft.Extensions.Logging;
using Microsoft.Recognizers.Text.DataTypes.TimexExpression;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;

namespace ToDoBot.Dialogs
{
    public class MainDialog : ComponentDialog
    {
        private readonly ToDoLUISRecognizer _luisRecognizer;
        protected readonly ILogger Logger;

        // Dependency injection uses this constructor to instantiate MainDialog
        public MainDialog(ToDoLUISRecognizer luisRecognizer, ILogger<MainDialog> logger)
            : base(nameof(MainDialog))
        {
            _luisRecognizer = luisRecognizer;
            Logger = logger;

            AddDialog(new TextPrompt(nameof(TextPrompt)));
            AddDialog(new WaterfallDialog(nameof(WaterfallDialog), new WaterfallStep[]
            {
                IntroStepAsync,
                ActStepAsync,
                FinalStepAsync,
            }));

            // The initial child Dialog to run.
            InitialDialogId = nameof(WaterfallDialog);
        }

        private async Task<DialogTurnResult> IntroStepAsync(WaterfallStepContext stepContext, CancellationToken cancellationToken)
        {
            return null;
        }

        private async Task<DialogTurnResult> ActStepAsync(WaterfallStepContext stepContext, CancellationToken cancellationToken)
        {
            return null;
        }      

        private async Task<DialogTurnResult> FinalStepAsync(WaterfallStepContext stepContext, CancellationToken cancellationToken)
        {

            // Restart the main dialog with a different message the second time around
            var promptMessage = "What else can I do for you?";
            return await stepContext.ReplaceDialogAsync(InitialDialogId, promptMessage, cancellationToken);
        }
    }
}