DictionaryExtensions.cs

public static class DictionaryExtensions
{
	private static readonly Random Generator = new Random();

	public static TValue GetRandom<TKey, TValue>(this IDictionary<TKey, TValue> dictionary)
	{
		var randomKey = dictionary.Keys.ToList()[Generator.Next(0, dictionary.Keys.Count)];

		return dictionary[randomKey];
	}
	
	/// <summary>
        /// Merge one dictionary with another.
        /// </summary>
        /// <param name="current">
        /// The current.
        /// </param>
        /// <param name="overrides">
        /// The overrides.
        /// </param>
        public static void Merge<TKey, TValue>(this IDictionary<TKey, TValue> current, IEnumerable<KeyValuePair<TKey, TValue>> overrides)
        {
            foreach (var @override in overrides)
            {
                if (current.ContainsKey(@override.Key))
                {
                    current[@override.Key] = @override.Value;
                }
                else
                {
                    current.Add(@override.Key, @override.Value);
                }
            }
        }
}