codeSamplearena.cs

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;


namespace CodeSamplesForArena.net
{
    class Program
    {
        static void Main(string[] args)
        {
            var selector = new Selector();
            var valueList = selector.createValueEnumerable();
            var valueListClass = new ValueList(valueList);
            var evenList = valueList.Where(x => { return selector.Even(x.value); });
            var oddList = valueListClass.Where(x => x.value % 2 > 0);

            Action<int> action = x => { Console.WriteLine(x); };
            OutputEnumerable(evenList, action);
            OutputEnumerable(oddList, action);

            Console.ReadKey();
        }
        private static void OutputEnumerable(IEnumerable<Value> enumerableValue, Action<int> action)
        {
            foreach (Value v in enumerableValue)
            {
                action(v.value);
            }
        }
    }

    public class Value
    {
        public int value { get; set; }
        public string name { get; set; }
    }

    public class Selector
    {
        public Func<int, bool> Even { get { return x => { return (x % 2 == 0); }; } }

        public IEnumerable<Value> createValueEnumerable()
        {
            var list = new List<Value>();
            for (int i = 0; i < 100; i++)
                list.Add(new Value { name = "foo" + i, value = i });
            return list;
        }
    }

    public class ValueList : IEnumerable<Value>
    {
        private List<Value> _valueList = new List<Value>();

        public ValueList(IEnumerable<Value> values)
        {
            _valueList.AddRange(values);
        }

        public void Add(Value value)
        {
            _valueList.Add(value);
        }

        public IEnumerator<Value> GetEnumerator()
        {
            foreach (Value v in _valueList)
                yield return v;
        }

        IEnumerator IEnumerable.GetEnumerator()
        {
            return GetEnumerator();
        }

  
    }
}