using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var collection = new Dictionary<int, string>

        {

            { 2, "foo" },

            { 3, "bar" }

        };

        foreach (var item in collection)

        {

            var result = ProcessItem(item);

            Console.WriteLine("Processed {0}: {1}", item.Key, string.Join(", ", result));

            var resultEnumerated = result.ToList();

        }

    }

​

    private static IEnumerable<string> ProcessItem(KeyValuePair<int, string> item)

    {

        if (item.Key % 2 == 0)

        {

            Console.WriteLine("{0}: even", item.Key);

            yield return "even";

        }

        if (item.Key % 2 != 0)

        {

            Console.WriteLine("{0}: odd", item.Key);

            yield return "odd";

        }

​

        if (item.Value == "bar")

        {

            Console.WriteLine("{0}: it'sbar", item.Key);

            yield return "it'sbar";

        }

    }

}