Get the Flags from an Enum as an Enumerable

getflags.cs

        /// <summary>
        /// This method retrieves all of the flags for a particular enum, and returns it as an enumerable.
        /// </summary>
        private static IEnumerable<Enum> GetFlags(Enum value, Enum[] values)
        {
            ulong bits = Convert.ToUInt64(value);
            List<Enum> results = new List<Enum>();

            for (int i = values.Length - 1; i >= 0; i--)
            {
                ulong mask = Convert.ToUInt64(values[i]);

                if (i == 0 && mask == 0L)
                {
                    break;
                }

                if ((bits & mask) == mask)
                {
                    results.Add(values[i]);
                    bits -= mask;
                }
            }

            if (bits != 0L)
                return Enumerable.Empty<Enum>();
            if (Convert.ToUInt64(value) != 0L)
                return results.Reverse<Enum>();
            if (bits == Convert.ToUInt64(value) && values.Length > 0 && Convert.ToUInt64(values[0]) == 0L)
                return values.Take(1);

            return Enumerable.Empty<Enum>();
        }