Console.Write("用户名：");
         string user = Console.ReadLine();
         Console.Write("密码：");
         string password = Console.ReadLine();

------解决方案--------------------

C# code

static void Main(string[] args)
        {
            string userTip="User:";
            string pwdTip="Password:";

            Console.WriteLine(userTip);
            Console.WriteLine(pwdTip);

            Console.SetCursorPosition(userTip.Length, 0);
            string user = Console.ReadLine();

            Console.SetCursorPosition(pwdTip.Length, 1);
            StringBuilder password = new StringBuilder();
            while (true)
            {
                ConsoleKeyInfo keyInfo = Console.ReadKey();
                if (keyInfo.Key == ConsoleKey.Enter)
                {
                    Console.WriteLine();
                    break;
                }
                else if (keyInfo.Key == ConsoleKey.Backspace && password.Length > 0)
                {                    
                    Console.Write('\0');
                    Console.CursorLeft--;
                    password.Remove(password.Length - 1, 1);                    
                }
                else
                {
                    //这里如果有需要的话，过滤一下不允许的字符，包括方向键之类的
                    password.Append(keyInfo.KeyChar);
                    Console.CursorLeft--;
                    Console.Write("*");
                }
            }

            Console.WriteLine(string.Concat("--- Input ---\r\n",userTip, user,"\r\n", pwdTip, password));

            Console.ReadLine();
        }

------解决方案--------------------
。。打错了。。是Console.ReadLine();