在C＃中覆盖和新的关键字之间的区别是什么？ [英] What is the difference between the override and new keywords in C#?

问题描述

在覆盖之间的区别是什么和新定义的类层次结构方法时，关键字在C＃？

What is the difference between the override and new keywords in C# when defining methods in class hierarchies?

推荐答案

下面的页面非常漂亮总结你的问题。

The following page summarizes your question very nicely.

知道何时使用替代和新关键字

摘要

替换：当基类的方法，在派生类中被覆盖，在派生类中使用的版本，即使调用code不知道对象是派生的类的一个实例。

Override: When a method of a base class is overridden in a derived class, the version in the derived class is used, even if the calling code didn't "know" that the object was an instance of the derived class.

新：如果您使用替代的新的关键字，而不是在派生类中的方法不覆盖的方法在基类中，它只是隐藏它。

New: If you use the new keyword instead of override, the method in the derived class doesn't override the method in the base class, it merely hides it.

如果你不指定新的或替代，输出结果是一样的，如果指定新的你，但你还可以得到一个编译器警告（你可能不知道，你隐藏了一种方法，基类的方法，或者实际上你可能想要覆盖它，只是忘了，包括关键字）。

If you don't specify either new or overrides, the resulting output is the same as if you specified new, but you'll also get a compiler warning (as you may not be aware that you're hiding a method in the base class method, or indeed you may have wanted to override it, and merely forgot to include the keyword).

替换：虚拟/抽象/覆盖方法的类的基类使用

Override: used with virtual/abstract/override type of method in base class

新：当基类没有申报方法，虚拟/抽象/覆盖

New: when base class has not declared method as virtual/abstract/override

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