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。

 1    public struct ProductType 
 2     {
 3         public const string JOURNAL ="JOURNAL";
 4         public const string AUTHOR = "AUTHOR";
 5         public const string ORGAN = "ORGAN";
 6         public const string PUBLISHER = "PUBLISHER";
 7         public const string AREA = "AREA";
 8         public const string FUND = "FUND";
 9         public const string SUBJECT = "SUBJECT"; 
10     }

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