是否可以将重写方法标记为final

问题描述

在C＃中，是否可以将重写的虚拟方法标记为final，因此实现者无法覆盖它？我该怎么做？

In C#, is it possible to mark an overridden virtual method as final so implementers cannot override it? How would I do it?

一个例子可以让它更容易理解：

An example may make it easier to understand:

class A
{
   abstract void DoAction();
}
class B : A
{
   override void DoAction()
   {
       // Implements action in a way that it doesn't make
       // sense for children to override, e.g. by setting private state
       // later operations depend on
   }
}
class C: B
{
   // This would be a bug
   override void DoAction() { }
}

有没有办法修改B为了防止其他子C在编译时或运行时覆盖DoAction？

Is there a way to modify B in order to prevent other children C from overriding DoAction, either at compile-time or runtime?

推荐答案

是的，用密封 ：

class A
{
   abstract void DoAction();
}
class B : A
{
   sealed override void DoAction()
   {
       // Implements action in a way that it doesn't make
       // sense for children to override, e.g. by setting private state
       // later operations depend on
   }
}
class C: B
{
   override void DoAction() { } // will not compile
}

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