I'm starting to worry about myself

So the "dynamic" linq query so far isn't just enough to stop. Oh no, now that I can have methods pass back expressions, what about a dictionary of order by expressions to allow an even more dynamic feel? Huh? How's about that kids? I hate myself too.

//Enum created for the dictionary key
public enum OrderByChoice
{
  FirstName,
  LastName,
  UserName
}

//dictionary of expressions
private static Dictionary<OrderByChoice, Expression<Func<User, String>>>  GetOrderByList()
{
  if(orderByList == null)
  {
    orderByList = new Dictionary<OrderByChoice,Expression<Func<User, String>>>();

    orderByList.Add(OrderByChoice.FirstName, currentUser => currentUser.FirstName);
    orderByList.Add(OrderByChoice.LastName, currentUser => currentUser.LastName);
    orderByList.Add(OrderByChoice.UserName, currentUser => currentUser.UserName);
  }
         
  return orderByList;
}   

That's right, I know. Silly, but I think it's cool. Now mind you, I could have methods that return expressions instead of the expressions themselves, but I wanted to show the expressions. And for the method call:

public static IList<User> GetUserList(OrderByChoice orderBy)
{
  return GetUserList(currentUser => true, GetOrderByList()[orderBy]).ToList();
}

And now you have an even more dynamicish call. I FORGOT THE USINGS!!!!

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