MafiaTelegramBot/MafiaTelegramBot/Models/Commands/Command.cs

using System.Linq;
using System.Threading.Tasks;
using MafiaTelegramBot.Resources;
using Telegram.Bot;
using Telegram.Bot.Types;

namespace MafiaTelegramBot.Models.Commands
{
    public abstract class Command
    {
        protected abstract string Name { get; }

        protected abstract Task Execute(long chatId, TelegramBotClient client);

        private bool Contains(string command)
        {
            return command.Contains(Name) && command.Contains(AppSettings.Name);
        }
        
        public static Task Update(Update update)
        {
            var commands = Bot.Commands;
            var message = update.Message.Text;
            var chatId = update.Message.Chat.Id;
            var client = Bot.Get();

            return (from command in commands
                where command.Contains(message)
                select command.Execute(chatId, client)).FirstOrDefault();
        }
    }
}