DynamicParam

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Dynamic;

namespace ConsoleApplication2
{
    class Program
    {
        static void Main(string[] args)
        {
            dynamic param = new DynamicParam();
            param.Message = "monkey";
            param.SayHi = new Action<string> (s => Console.WriteLine(s));
            
            DoStuff(param);
            Console.ReadLine();
        }

        static void DoStuff(dynamic args)
        {
            Console.WriteLine(args.Message);  //This param is required since we don't check if exists or not
            if(args.HasTitle)  //Check to see if args Has a Title param, since we don't this statement doesn't execute
                Console.WriteLine(args.Title);
            if(args.HasSayHi) //Check to see if args Has a SayHi method
                args.SayHi("h22i");
        }
    }

    class DynamicParam : DynamicObject
    {
        private Dictionary<string, object> _members = new Dictionary<string, object>();

        public override bool TryGetMember(GetMemberBinder binder, out object result)
        {
            if (binder.Name.StartsWith("Has"))
            {
                var name = binder.Name.Substring(3);
                if (_members.ContainsKey(name))
                    result = true;
                else
                    result = false;
                return true;
            }
            else
            {
                if (_members.ContainsKey(binder.Name))
                {
                    result = _members[binder.Name];
                    return true;
                }
                else
                {
                    result = false;
                    return true;
                }
            }
        }

        public override bool TrySetMember(SetMemberBinder binder, object value)
        {
            if (!_members.ContainsKey(binder.Name))
                _members.Add(binder.Name, value);
            else
                _members[binder.Name] = value;
            return true;  
        }
    }
}