覆盖 GetHashCode [英] Overriding GetHashCode

问题描述

如您所知，GetHashCode 返回一个半唯一值，可用于标识集合中的对象实例.作为一种很好的做法，建议覆盖此方法并实现您自己的方法.

As you know, GetHashCode returns a semi-unique value that can be used to identify an object instance in a collection. As a good practice, it is recommended to override this method and implement your own.

我的问题是 - 在处理自定义对象时您是否覆盖此方法?如果是这样，您使用什么算法来生成唯一 ID?

My question is - do you override this method when working on custom objects? If so, what algorithm do you use to generate the unique ID?

我正在考虑生成一个 GUID，然后从该标识符中获取整数数据.

I was thinking about generating a GUID and then getting integer data from that identificator.

推荐答案

当你重写 GetHashCode() 时你还需要重写 Equals(), operator== 和 operator!= .并且要非常小心地满足这些方法的所有要求.

When you override GetHashCode() you also need to override Equals(), operator== and operator!= . And be very careful to meet all the requirements for those methods.

指南位于 MSDN 上.最重要的引述:

The guidelines are here on MSDN. Most important quote:

在可变类型中覆盖运算符 == 不是一个好主意.

It is not a good idea to override operator == in mutable types.

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