8 避免给枚举元素提供显示的值

        static Week week = Week.TempValue; 
        public static void Main(string[] args)
        {
            Console.WriteLine(week);
            Console.ReadLine();
        }
        enum Week
        {
            Monday=1,
            Tuesday=2,
            TempValue,
            Wednesday=3,
            Thursday,
            Friday,
            Saturday,
            Sunday
        }

输出为：Wednesday