BotBuilder-Samples/CSharp/core-GetConversationMembers/Controllers/MessagesController.cs

namespace GetConversationMembersBot
{
    using System;
    using System.Linq;
    using System.Net;
    using System.Net.Http;
    using System.Threading.Tasks;
    using System.Web.Http;
    using Microsoft.Bot.Builder.Dialogs;
    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 || activity.Type == ActivityTypes.ConversationUpdate)
            {
                await Conversation.SendAsync(activity, () => new GetConversationMembersDialog());
            }
            else
            {
                this.HandleSystemMessage(activity);
            }

            var response = Request.CreateResponse(HttpStatusCode.OK);
            return response;
        }

        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.ContactRelationUpdate)
            {
                // Handle add/remove from contact lists
                // Activity.From + Activity.Action represent what happened
            }
            else if (message.Type == ActivityTypes.Typing)
            {
                // Handle knowing tha the user is typing
            }
            else if (message.Type == ActivityTypes.Ping)
            {
            }

            return null;
        }
    }
}