是C＃方法密封或默认的虚拟？ [英] Is C# method sealed or virtual by default?

问题描述

我知道的定义虚拟和密封关键字，但如果你不使用其中任何一个有的方法，可以在方法默认情况下被覆盖？

I know the definitions of virtual and sealed keywords, but if you don't use either of them with a method, can the method be overriden by default?

我从vb.net背景的。它是这样在vb.net（从MSDN）：

I am coming from vb.net background. It goes like this in vb.net (from MSDN):

如果没有指定可重写或NotOverridable修饰符，在
默认设置取决于该属性或方法是否覆盖了一个
基类的属性或方法。如果属性或方法将重写
基类的属性或方法，默认设置为可覆盖;
否则就是NotOverridable。

If the Overridable or NotOverridable modifier is not specified, the default setting depends on whether the property or method overrides a base class property or method. If the property or method overrides a base class property or method, the default setting is Overridable; otherwise, it is NotOverridable.

我只是想知道这是否也是如此在C＃。

I just want to know if that's also true in C#.

推荐答案

没有它不能。你需要明确地标记方法，虚拟允许它在派生类中重写。

No it cannot. You need to explicitly mark a method as virtual to allow it to be overridden in derived classes.

什么，但是你可以做的，是通过使用new关键字隐藏的方法。 （MSDN文档）

What you can do however, is hide a method by using the new keyword. (MSDN Documentation)

密封的关键字用来在两个类定义和方法。它不允许从方法的类或压倒一切的继承。默认情况下，如果不使用此关键字，别人就能从你的类继承。 （ MSDN文档）

The sealed keyword is used on both class definitions and methods. It disallows inheriting from a class or overriding of a method. By default, if you don't use this keyword, others will be able to inherit from your class. (MSDN Documentation)

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