All Length String Permutations

IReadOnlyCollection<int> range = Enumerable.Range(48, 57)
                                                       .Union(Enumerable.Range(97, 122))
                                                       .Union(new[] { 45, 95 }).ToArray();
            IReadOnlyCollection<char> rangeChars = range.Select(s => (char)s).ToArray();

            int maxLength = 5;

            for (int i = 1; i <= maxLength; i++)
            {
                IEnumerable<IEnumerable<char>> test = StringGeneration.GetPermutations(rangeChars, i);

                foreach (var t in test)
                {
                    Console.WriteLine(t.ToArray());
                }
            }