Example.cs

namespace Company
{
    using System;

    public abstract class Handler
    {
        public static implicit operator Handler(Action<ResponseWriter, Request> handler)
        {
            return new HandlerWrapper(handler);
        }

        public abstract void Serve(ResponseWriter response, Request request);

        private class HandlerWrapper : Handler
        {
            private readonly Action<ResponseWriter, Request> _handler;

            public HandlerWrapper(Action<ResponseWriter, Request> handler)
            {
                if (handler == null)
                {
                    throw new ArgumentNullException("handler");
                }

                _handler = handler;
            }

            public override void Serve(ResponseWriter response, Request request)
            {
                _handler(response, request);
            }
        }
    }
    
    public class Router
    {
        public Route Handle(string path, Handler handler)
        {
            return null;
        }
    }
    
    public class Program
    {
        public static void Main(string[] arguments)
        {
            var router = new Router();

            router.Handle("/api/v1/users", ListUsers).Methods(HttpMethods.Get);

            Server.ListenAndServe(":8080", router);
        }

        private static void ListUsers(ResponseWriter response, Request request)
        {
        }
    }
}