using System;

using System.Linq.Expressions;

​

namespace ConsoleApplication1

{

    public class Program

    {

        public enum E { A,B }

​

        public static Func<TFrom, TTo> MakeCast<TFrom, TTo>()

        {

            var tfrom = typeof(TFrom);

            var tto = typeof(TTo);

​

            ParameterExpression eParam = Expression.Parameter(tfrom);

            Expression body = Expression.Convert(eParam, tto);

            var l = Expression.Lambda<Func<TFrom, TTo>>(body, eParam);

            return l.Compile();

        }

​

​

        public static void Main(string[] args)

        {

            var mc = MakeCast<Int32, E>();

​

            E e = mc(1);

            Console.WriteLine(e);

        }

    }

}

​