猜数字游戏我也来凑热闹

从技术上来看，还算新人吧。看到这个以前十分喜欢的游戏，忍不住来凑凑热闹。大家别笑。

    public class GuessGame
    {
        public int[] Answers { get; private set; }
        public int MaxAttemptTimes { get; set; }

        public int AttemptTimes { get; private set; }
        public bool IsSuccess { get; private set; }

        public bool isEnd
        {
            get
            {
                return !(AttemptTimes < MaxAttemptTimes) || IsSuccess;
            }
        }

        public GuessGame()
        {
            Answers = new int[4];
            MaxAttemptTimes = 6;

            NewGames();
        }

        public void NewGames()
        {
            buildAnswers();
            AttemptTimes = 0;
            IsSuccess = false;
        }

        private void buildAnswers()
        {
            Random random = new Random();

            do
            {
                Answers[0] = random.Next(9);
                Answers[1] = random.Next(9);
                Answers[2] = random.Next(9);
                Answers[3] = random.Next(9);

            } while (!isValidate(Answers));
        }

        public string Test(int[] answer)
        {
            string result;
            int a = 0;
            int b = 0;

            if(isEnd)
            {
                result = "对不起，比赛已经结束。";

                if (IsSuccess) { result += "您赢得了比赛！"; }
                else { result += "一次失败不算什么，请再接再厉！"; }

                return result;
            }

            if (!isValidate(answer)) { return "对不起，输入结果不符合要求"; }

            for (int i = 0; i < Answers.Length; i++)
            {
                if (answer[i] == Answers[i]) { a++; }
                if (Answers.Any(r => r == answer[i])) { b++; }
            }

            if (4 == a) { IsSuccess = true; }

            b -= a;

            AttemptTimes++;

            return "这是你的第" + AttemptTimes + "次测试：" + a.ToString() + "A" + b.ToString() + "B";
        }

        private bool isValidate(int[] answer)
        {
            if (4 != answer.Length) { return false; }
            
            foreach (int i in answer)
            {
                if (answer.Where(a => a == i).Count() > 1) { return false; }
            }
            
            return true;
        }

    }

    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("我猜，我猜，我猜猜猜！");

            GuessGame games = new GuessGame();

            while (true)
            {
                if (games.isEnd)
                {
                    if (games.IsSuccess) { Console.WriteLine("恭喜你，成功了。"); }
                    else { Console.WriteLine("失败是成功之母！"); }

                    Console.WriteLine("是否继续新游戏（Y/N）？");
                    char c = (char)Console.Read();
                    Console.ReadLine();

                    if ("y" == c.ToString().ToLower()) { games.NewGames(); }
                    else { return; }
                }

                Console.Write("请输入四位数字：");
                string input = Console.ReadLine();

                if (!Regex.IsMatch(input, @"^\d{4}$")) { Console.WriteLine("输入错误！"); }
                else
                {
                    int[] answer = new int[4];
                    for (int i = 0; i < 4; i++)
                    {

                        answer[i] = Int32.Parse(input[i].ToString());
                    }

                    Console.WriteLine(games.Test(answer));
                }
            }
        }
    }

请大家多多指教。

ps: 怎么发表到话题下面？？？？  不太明白。第一次发首页，有不合适的地方请多多包涵。