Bet this starts freaking people out sooner rather than later. I personally love it. Go duck typing. (and unit tests).

Looking at Ayende’s potential DB solution over Lucene and it’s peek my interest. I remember writing so much reflection code for dynamics and JSON, now its more or less out of the box.

using System;
using System.Text;
using System.Collections.Generic;
using System.Linq;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using System.Dynamic;

namespace Dynamics
{
    [TestClass]
    public class UnitTest1
    {
        [TestMethod]
        public void TestMethod1()
        {
            dynamic d = new Bag();
            d.Age = 25;
            d.Name = "Terrance";

            Action<dynamic> hi = (self) => Console.WriteLine("{0} is {1} years old!", self.Name, self.Age);
            d.SayHello = hi;

            // result = "Terrance is 25 years old!";
            d.SayHello();

            // result = "Terrance is 25 years old!";
            SayHelloAgain(d);
        }

        void SayHelloAgain(dynamic d)
        {
            d.SayHello();
        }
    }

    public class Bag : DynamicObject
    {
        Dictionary<string, object> _properties = new Dictionary<string, object>();

        public override bool TryGetMember(GetMemberBinder binder, out object result)
        {
            result = _properties[binder.Name];
            return _properties.ContainsKey(binder.Name);
        }

        public override bool TrySetMember(SetMemberBinder binder, object value)
        {
            _properties[binder.Name] = value;
            return true;
        }

        public override bool TryInvokeMember(InvokeMemberBinder binder, object[] args, out object result)
        {
            dynamic target = _properties[binder.Name];
            bool match = false;
            result = null;
            switch (args.Length)
            {
                case 0:
                    target(this);
                    match = true;
                    break;
            }
            return match;
        }
    }
}