Pchp.Library.Arrays.RandomSubset C# (CSharp) Method

        private static bool RandomSubset(ICollection<IntStringKey> source, IList<PhpValue> result, int count, Random generator)
        {
            if (source == null)
            {
                // TODO: PhpException.ArgumentNull("array");
                return false;
            }
            if (result == null)
            {
                // TODO: PhpException.ArgumentNull("result");
                return false;
            }
            if (generator == null)
            {
                // TODO: PhpException.ArgumentNull("generator");
                return false;
            }
            if (count < 1 || count > source.Count)
            {
                // TODO: PhpException.InvalidArgument("count", LibResources.GetString("number_of_items_not_between_one_and_item_count", count, source.Count));
                return false;
            }

            int n = source.Count;
            using (var iterator = source.GetEnumerator())
            {
                while (iterator.MoveNext())
                {
                    // adds item to result with probability count/n:
                    if ((double)count > generator.NextDouble() * n)
                    {
                        result.Add(PhpValue.Create(iterator.Current));
                        if (--count == 0) break;
                    }
                    n--;
                }
            }

            return true;
        }