自定义方法addmoney，模拟手机充值的过程，在方法中输入“充值卡卡号#充值卡密码#充值的手机号码”字符串，从中取出要充值的手机号码，向用户确认是否要充值，输入1确定，输入其他任意键放弃，方法返回的充值是否成功，在Main（）方法中输出结果。

小弟的代码：
static void Main(string[] args)
        {
            int position;
            string shoujihao;
            string getshouji;
            Console.WriteLine("请输入充值卡卡号#充值卡密码#充值的手机号");
            shoujihao = Console.ReadLine();
            position = shoujihao.IndexOf("#");
            getshouji = shoujihao.Substring(position, shoujihao.Length - position);

            getshouji = addmoney(shoujihao);
            
            Console.WriteLine(getshouji);
            Console.ReadLine();
        }
        private static string addmoney(string shoujihao)
        {
            
            string getshouji;
            if (getshouji equals (shoujihao)
            {
                Console.WriteLine("确认请输入1");
            }
            else
            {
             Console.WriteLine("确认请输入2");
            }
          return shoujihao;

谢谢大家帮帮了！

static void Main(string[] args)
        {
            String[] s = new String[3];
            Console.WriteLine("请输入充值卡卡号#充值卡密码#充值的手机号");
            String num = Console.ReadLine();
            s = num.Split(new char[] { '#' });

            String shoujihao = addmoney(s[2]);
            if(shoujihao == null)
            {
                Console.WriteLine("充值失败!");
                return;
            }  
            Console.WriteLine(shoujihao + "已充值成功!");
            Console.ReadLine();
        }
        private static string addmoney(string shoujihao)
        {
            int inPut = 0;
            Console.WriteLine("确认请输入1");
            inPut = Convert.ToInt32(Console.ReadLine());
            if (inPut == 1)
                   return shoujihao;
            else
                   return null;
        }
这样应该能符合你的要求!

static void Main(string[] args)
        {
            int position;
            string shoujihao;
            string getshouji;
            Console.WriteLine("请输入充值卡卡号#充值卡密码#充值的手机号");
            shoujihao = Console.ReadLine();
            position = shoujihao.LastIndexOf("#");
            getshouji = shoujihao.Substring(position + 1, shoujihao.Length - position-1);
            Console.WriteLine("手机号为:{0}", getshouji);
            if (addmoney())
            {
                Console.WriteLine("冲值成功");
            }
            else
            {
                Console.WriteLine("用户放弃");
            }
        }

        private static bool addmoney()
        {
            Console.WriteLine("是否冲值? 1确定，其他放弃");
            if(int.Parse(Console.ReadLine())==1)
            {
                return true;
            }
            else
            {
                return false;
            }
        }


帮你重写了下.发现你这个程序与要表达的意思完全不一样

辛苦了 谢谢解答的那么详细！！