One of the major benefits of Design by Contract is that it provides explicit information within the interface or class itself about expected behavior.
契约式设计的一个主要优势是，它在接口或类本身当中提供了关于预期行为的显式信息。
Class does not support Automation or does not support expected interface.
类不支持自动化或不支持所需的接口。
Run-time error '430':Class does not support Automation or does not support expected interface.
执行期间错误 '430'：类别不支援 Automation 或不支援预期的介面。
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