A class member, method, field, property, or event, on a derived class that is overriding a virtual member of the base class can declare that member as sealed.

若类别成员、方法、栏位、属性或事件是位于覆写基底类别虚拟成员的衍生类别上，则可宣告为密封。

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A class member, method, field, property, or event, on a derived class that is overriding a virtual member of the base class can declare that member as sealed.

若类别成员、方法、栏位、属性或事件是位于覆写基底类别虚拟成员的衍生类别上，则可宣告为密封。

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