C#/面向对象设计-保持有效的对象状态 [英] C# / Object oriented design - maintaining valid object state

问题描述

在设计类时，应将保持有效状态的逻辑合并到类中还是在其外部?也就是说，属性应该在无效状态(例如，值超出范围等)上引发异常，还是应该在构造/修改类的实例时执行此验证?

When designing a class, should logic to maintain valid state be incorporated in the class or outside of it ? That is, should properties throw exceptions on invalid states (i.e. value out of range, etc.), or should this validation be performed when the instance of the class is being constructed/modified ?

推荐答案

它属于该类.除了类本身(及其委托的任何帮助者)之外，什么都不应该知道或关心确定有效或无效状态的规则.

It belongs in the class. Nothing but the class itself (and any helpers it delegates to) should know, or be concerned with, the rules that determine valid or invalid state.

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