如何从一类原始的哈希代码重新实现GetHashCode？ [英] How to get raw hash code from a class that re-implements GetHashCode?

问题描述

短的问题：如何才能获得一个物体的 object.GetHashCode（）价值已重新实现的GetHashCode（）

Short question: How do I get the object.GetHashCode() value for an object that has re-implemented GetHashCode()?

龙的故事：
所以我有大约十万的对象，每个共享很多（非编译时）常见的字符串。常见的如如果该值相等，这是同一个实例。

Long story: So I have about a hundred thousand objects, each sharing many (non-compile time) common strings. Common as in if the value is equal, it is the same instance.

知道了，我想我宁愿使用标准的对象比较（的ReferenceEquals ），而不是一个完整的字符串比较 - 尤其是当这些都抬起头来在字典上相当定期

Knowing that, I figure I'd rather use a standard object comparison (ReferenceEquals) rather than a full string compare - particularly as these are looked up in dictionaries on a fairly regular basis.

所以，我宣布一个类ReferenceEqualityComparer：的IEqualityComparer 与使用词典<字符串，TValue> ，认定它会是有反正有用和去试图实现这两种方法。

So I declare a class ReferenceEqualityComparer : IEqualityComparer to use with a Dictionary<string, TValue>, figuring it'd be useful to have anyway, and go about trying to implement the two methods.

等于是很容易的，使用 object.ReferenceEquals 。

Equals is easy enough, use object.ReferenceEquals.

不过，我如何获得 object.GetHashCode（）为的GetHashCode <相当于/ code>方法？

But how do I get the equivalent of object.GetHashCode() for the GetHashCode method?

即如何获取对象实例的一些代表性？

ie how do I get some representation of an object's instance?

我知道有其他的方式，我可以去这样做 - 创建一个 InternedString 类持有到字符串的引用 ，但不实施等于或的GetHashCode ，或存储索引，而不是每个对象的字符串，但我现在好奇 - 是否有真正实现一个通用的 ReferenceEqualityComparer

I know there are other ways I can go about doing this - create an InternedString class which holds a reference to the string, but does not implement Equals or GetHashCode, or store indexes rather than strings with each object, but I'm now curious - is there actually a way to implement a generic ReferenceEqualityComparer?

推荐答案

看一看 RuntimeHelpers.GetHashCode（对象） 。

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