结构体和枚举

声明一个枚举类型，与struct的区别是：枚举里的变量都是整型的同类型，而struct是由不同类型的变量所组成的，默认情况下，枚举的第一个值为0，后面每个连续的元素值递增1。

   public struct ProductType 
    {
        public const string JOURNAL ="JOURNAL";
        public const string AUTHOR = "AUTHOR";
        public const string ORGAN = "ORGAN";
        public const string PUBLISHER = "PUBLISHER";
        public const string AREA = "AREA";
        public const string FUND = "FUND";
        public const string SUBJECT = "SUBJECT"; 
    }

 

enum WeekDay
    {
        Sunday,
        //Sunday = 1, 也可以直接赋值
        Monday,
        Tuesday,
        Wednesday,
        Thursday,
        Friday,
        Saturday
    };