大家看看这段C#为什么不执行循环

static void Main(string[] args)
        {             Console.WriteLine("请输入字符");
            string rString = Console.ReadLine();
            char[] rCharArr = rString.ToCharArray();
            for (int i = rCharArr.Length - 1; i >= 0;i-- )
            {

                Console.WriteLine("{0}",rCharArr[i]);
            }
            Console.ReadKey();
        }