Enum extensions

gistfile1.txt

        public static IEnumerable<T> MaskToList<T>(this Enum mask)
        {
            if (typeof(T).IsSubclassOf(typeof(Enum)) == false)
                throw new ArgumentException();

            return Enum.GetValues(typeof(T))
                                 .Cast<Enum>()
                                 .Where(m => mask.HasFlag(m))
                                 .Cast<T>();
        }

        public static string MaskToString<T>(this Enum mask, string separator)
        {
            string result = mask
                            .MaskToList<T>()
                            .Select(i => i.ToString())
                            .ToString(separator);
            return result;
        }