using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        var db = RobloxDatabase.RobloxUniverses;

        var connectionString = db.GetConnectionString();

        Console.WriteLine(connectionString);

        connectionString = db.GetConnectionString();

        Console.WriteLine(connectionString);

        db = RobloxDatabase.RobloxBilling;

        connectionString = db.GetConnectionString();

        Console.WriteLine(connectionString);

    }

}

​

public class Settings

{

    public string RobloxBilling { get { return "RobloxBilling Connection String"; } }

    public string RobloxVoting { get { return "RobloxVoting Connection String"; } }

    public string RobloxUniverses { get { return "RobloxUniverses Connection String"; } }

}

​

public enum RobloxDatabase

{

    RobloxBilling,

    RobloxVoting,

    RobloxUniverses

}

​

public static class Extensions

{

    private static IDictionary<RobloxDatabase, Func<Settings, string>> _DelegateCache = new Dictionary<RobloxDatabase, Func<Settings, string>>();

    private static Settings _Settings = new Settings();

    private static Type _SettingsType = typeof(Settings);

    public static string GetConnectionString(this RobloxDatabase db)

    {       

        Func<Settings, string> getter;

        if (!_DelegateCache.TryGetValue(db, out getter))

        {

            Console.WriteLine("Cache miss for {0}", db);

            var propertyInfo = _SettingsType.GetProperty(db.ToString());

            var getMethodInfo = propertyInfo.GetGetMethod();

            getter = (Func<Settings, string>)getMethodInfo.CreateDelegate(typeof(Func<Settings, string>));

            _DelegateCache.Add(db, getter);

        }

        else

        {

            Console.WriteLine("Cache hit for {0}", db);

        }

        return getter(_Settings);

    }

}