字典枚举顺序

本文介绍了字典枚举顺序的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

文档显示未指定 Dictionary 按键顺序.我想这意味着在枚举期间第一个添加的元素可能不是第一个.但是 Dictionary 是否保证每次我枚举顺序都相同?

Documentation says Dictionary keys order is unspecified. I guess it means the first added element may be not first during enumeration. But does Dictionary guarantee order to be the same each time I enumerate it?

推荐答案

是的，当前它确实以相同的顺序返回项目(假设您同时未触发散列表的调整大小).

Yes, currently it does return items in the same order (assuming that you don't trigger a resize of the hashtable in the meantime).

不，您不应依赖它.

通常来说，除非明确保证顺序保持不变，否则您不能假设任何内容.而且肯定没有这样的保证没有给出:

Generally speaking, unless there is an explicit guarantee that the order remains the same, then you cannot assume anything. And such a guarantee most certainly is not given:

物品退回的顺序是不确定的.

The order in which the items are returned is undefined.

如果您对出于学术目的的详细信息感兴趣，请参阅这篇出色的博客文章.

If you are interested in the details for academic purposes, see this excellent blog post.