GUID是否在100％的时间内是唯一的? [英] Is a GUID unique 100% of the time?

问题描述

GUID是否在100％的时间内是唯一的?

Is a GUID unique 100% of the time?

它会在多个线程中保持唯一性吗?

Will it stay unique over multiple threads?

推荐答案

每个生成的GUID不是 保证是唯一的，总的 唯一键的数量(2 ¹²⁸ 或 3.4×10 ³⁸ )太大，以至于出现相同数字的概率 两次生成的很小.为了 例如，考虑可观察 宇宙，其中包含约5×10 ²² 星星然后每个星星都可以拥有 6.8×10 ¹⁵ 通用的GUID.

While each generated GUID is not guaranteed to be unique, the total number of unique keys (2¹²⁸ or 3.4×10³⁸) is so large that the probability of the same number being generated twice is very small. For example, consider the observable universe, which contains about 5×10²² stars; every star could then have 6.8×10¹⁵ universally unique GUIDs.

来自维基百科.

这些是有关如何制作GUID(用于.NET)以及如何在适当的情况下获得相同GUID的不错的文章.

These are some good articles on how a GUID is made (for .NET) and how you could get the same guid in the right situation.

https://ericlippert.com/2012/04/24 /guid-guide-part-one/

https://ericlippert.com/2012/04/30 /guid-guide-part-two/

https://ericlippert.com/2012/05/07 /guid-guide-part-three/

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