BotBuilder-Samples/CSharp/demo-Search/JobListingBot/Dialogs/IntroDialog.cs

namespace JobListingBot.Dialogs
{
    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Threading.Tasks;
    using Microsoft.Bot.Builder.Dialogs;
    using Microsoft.Bot.Builder.Internals.Fibers;
    using Microsoft.Bot.Connector;
    using Search.Dialogs;
    using Search.Models;
    using Search.Services;

    [Serializable]
    public class IntroDialog : IDialog<object>
    {
        protected readonly SearchQueryBuilder QueryBuilder = new SearchQueryBuilder();
        private readonly ISearchClient searchClient;

        public IntroDialog(ISearchClient searchClient)
        {
            SetField.NotNull(out this.searchClient, nameof(searchClient), searchClient);
        }

        public Task StartAsync(IDialogContext context)
        {
            context.Wait(this.SelectTitle);
            return Task.CompletedTask;
        }

        public Task SelectTitle(IDialogContext context, IAwaitable<IMessageActivity> input)
        {
            context.Call(
                new SearchRefineDialog(
                    this.searchClient, 
                    "business_title", 
                    this.QueryBuilder, 
                    prompt: "Hi! To get started, what kind of position are you looking for?"),
                this.StartSearchDialog);
            return Task.CompletedTask;
        }

        public async Task StartSearchDialog(IDialogContext context, IAwaitable<string> input)
        {
            string title = await input;

            if (string.IsNullOrEmpty(title))
            {
                context.Done<object>(null);
            }
            else
            {
                context.Call(new JobsDialog(this.searchClient, this.QueryBuilder), this.Done);
            }
        }

        public async Task Done(IDialogContext context, IAwaitable<IList<SearchHit>> input)
        {
            var selection = await input;

            if (selection != null && selection.Any())
            {
                string list = string.Join("\n\n", selection.Select(s => $"* {s.Title} ({s.Key})"));
                await context.PostAsync($"Done! For future reference, you selected these job listings:\n\n{list}");
            }

            this.QueryBuilder.Reset();
            context.Done<object>(null);
        }
    }
}