域不允许在C＃中的接口 [英] fields not allowed in C# interface

问题描述

有相当多的在Java中的偏差和C＃语言，其中一个我观察到的是，我们不能在一个界面中添加变量常量。从Java背景被我被莫名其妙地看到编译错误，当我尝试这样做。

There are quite a lot of deviations in Java and C# languages, one of which I observed was we cannot add variable constants in an interface. Being from Java background I got baffled to see compilation error when I tried this.

有谁有解释为什么是这样呢？

Does anyone has explanation why it is so?

推荐答案

一个字段是实现细节的一类，不应该暴露了它的接口。
接口是一种方法，一类抽象掉的实施细则。这两个概念看起来矛盾，真的不适合在一起。

A field is an implementation detail of a class and should not be exposed an its interface. An interface is a way to abstract away implementation details of a class. These two concepts look contradictory and don't really fit together.

您的可以的声明中，而不是接口的属性。

You can declare properties in interfaces instead.

的 UPDATE（实现后的问题是关于常量，而不是变量域）：的我认为的（纯属我个人猜测）了Java决定允许这样的结构，因为它不具备枚举类型当时的情况。从一开始的C＃已枚举和优选那些大部分时间常数。此外，您可以创建在C＃中的静态类，并添加你喜欢它的一切，运沿界面没有任何真正的麻烦。支持这种结构只想让接口定义更为复杂。

UPDATE (after realizing the question was about constants, not variable fields): I think (purely my personal speculation) that Java decided to allow such a construct because it didn't have enum types back then. C# has had enums since the beginning and preferred those to constants most of the time. Moreover, you can create a static class in C# and add everything you like in it and ship it along the interface without any real hassles. Supporting such a construct would just make interface definitions more complicated.

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