AFP: Almost Functional Programming in C#: Part 2

using System;
using System.Collections.Generic;

namespace StockTest
{
    public sealed class GlobalState
    {
        public readonly XmlConfig Config;
        public readonly Dictionary<string, Subscription> SubscriptionHash;
        public readonly Dictionary<string, Portfolio> PortfolioHash;

        public GlobalState(XmlConfig config, Dictionary<string, Subscription> subscriptionHash, Dictionary<string, Portfolio> portfolioHash)
        {
            if (config == null) throw new ArgumentNullException("config");
            if (subscriptionHash == null) throw new ArgumentNullException("subscriptionHash");
            if (portfolioHash == null) throw new ArgumentNullException("portfolioHash");

            Config = config;
            SubscriptionHash = subscriptionHash;
            PortfolioHash = portfolioHash;
        }
    }
}