C# 是否可以将重写的方法标记为 final
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is it possible to mark overridden method as final
提问by dbkk
In C#, is it possible to mark an overridden virtual method as final so implementers cannot override it? How would I do it?
在 C# 中，是否可以将重写的虚拟方法标记为 final 以便实现者无法重写它？我该怎么做？
An example may make it easier to understand:
举个例子可能更容易理解：
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() { }
}
Is there a way to modify B in order to prevent other children C from overriding DoAction, either at compile-time or runtime?
有没有办法修改 B 以防止其他子 C 在编译时或运行时覆盖 DoAction？
采纳答案by Lucero
Yes, with "sealed":
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
}
回答by RichieHindle
You need "sealed".
你需要“密封”。
回答by Ryan Emerle
You can mark the method as sealed.
您可以将该方法标记为sealed.
http://msdn.microsoft.com/en-us/library/aa645769(VS.71).aspx
http://msdn.microsoft.com/en-us/library/aa645769(VS.71).aspx
class A
{
public virtual void F() { }
}
class B : A
{
public sealed override void F() { }
}
class C : B
{
public override void F() { } // Compilation error - 'C.F()': cannot override
// inherited member 'B.F()' because it is sealed
}
回答by serg10
Individual methods can be marked as sealed, which is broadly equivalent to marking a method as final in java. So in your example you would have:
可以将单个方法标记为sealed，这大致相当于在java 中将方法标记为final。因此，在您的示例中，您将拥有：
class B : A
{
override sealed void DoAction()
{
// implementation
}
}
