BotBuilder-Samples/CSharp/demo-Search/RealEstateBot/Controllers/MessagesController.cs

namespace RealEstateBot
{
    using System.Net;
    using System.Net.Http;
    using System.Threading.Tasks;
    using System.Web.Http;
    using Autofac;
    using Microsoft.Bot.Builder.Dialogs;
    using Microsoft.Bot.Builder.Dialogs.Internals;
    using Microsoft.Bot.Connector;

    [BotAuthentication]
    public class MessagesController : ApiController
    {
        /// <summary>
        /// POST: api/Messages
        /// Receive a message from a user and reply to it
        /// </summary>
        public async Task<HttpResponseMessage> Post([FromBody] Activity activity)
        {
            if (activity.Type == ActivityTypes.Message)
            {
                using (var scope = DialogModule.BeginLifetimeScope(Conversation.Container, activity))
                {
                    await Conversation.SendAsync(activity, () => scope.Resolve<IDialog<object>>());
                }
            }
            else
            {
                this.HandleSystemMessage(activity);
            }

            return Request.CreateResponse(HttpStatusCode.OK);
        }

        private Activity HandleSystemMessage(Activity message)
        {
            if (message.Type == ActivityTypes.DeleteUserData)
            {
                // Implement user deletion here
                // If we handle user deletion, return a real message
            }
            else if (message.Type == ActivityTypes.ConversationUpdate)
            {
                // Handle conversation state changes, like members being added and removed
                // Use Activity.MembersAdded and Activity.MembersRemoved and Activity.Action for info
                // Not available in all channels
            }
            else if (message.Type == ActivityTypes.ContactRelationUpdate)
            {
                // Handle add/remove from contact lists
                // Activity.From + Activity.Action represent what happened
            }
            else if (message.Type == ActivityTypes.Typing)
            {
                // Handle knowing that the user is typing
            }
            else if (message.Type == ActivityTypes.Ping)
            {
            }

            return null;
        }
    }
}