Could not serialize { 0 }. Default constructors are required for collections and enumerators.

未能序列化{0}. 集合和枚举数需要默认构造函数.

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The enumerators determine the type to which they promote. And that type is machine - dependent.

其枚举成员决定了它们提升的类型, 而所提升的类型依赖于机器.

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When using operators on enumerators, both operands must be of the enumeration type.

对枚举数使用运算符时, 两个操作数必须都是枚举类型.

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