如果事件是由不符合 CLS 的语言所创建，则会发生此错误。

This can happen if the event was created by a non-CLS-compliant language.

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同样地，如果类别标记符合 CLS 标准，那麽必须个别标示所有不符合 CLS 标准的成员。

Similarly, if a class is marked as CLS-compliant, you must individually mark all members that are not CLS-compliant.

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以及任何基于符合CLS的基础整数类型的枚举类型。

And any enumeration type based on a CLS-compliant base integer type.

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