using System;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        var one = new SomeClass{First = 1, Second = 5};

        var two = new SomeClass{First = 5, Second = 1};

        Func<SomeClass, int> referrer = null;

        A a = A.b;

        switch (a)

        {

            case A.a:

                referrer = x => x.First;

                break;

            case A.b:

                referrer = x => x.Second;

                break;

        }

​

        if (referrer(one) < referrer(two))

        {

            Console.WriteLine("one is smaller than two");

        }

        else

        {

            Console.WriteLine("one is greater than two");

        }

    }

​

    public class SomeClass

    {

        public int First

        {

            get;

            set;

        }

​

        public int Second

        {

            get;

            set;

        }

    }

    public enum A { a, b } 

}