是否可以确保ConcurrentDictionary的列表顺序? [英] Is the list order of a ConcurrentDictionary guaranteed?

问题描述

我正在使用ConcurrentDictionary存储日志行，当需要向用户显示日志行时，我致电ToList()生成列表.但是奇怪的是，某些用户在列表中排在第一位，而在逻辑上应该排在最后.

这是因为ConcurrentDictionary不保证IEnumerate接口上的持久性顺序吗?或者是什么原因?

解决方案

否ConcurrentDictionary(和Dictionary<T>)不能保证列表中键的顺序.您将必须使用其他数据类型或自己执行排序.对于非并行代码，您可以使用 SortedDictionary<T> ，但我不认为并发集合中有类似的东西.

I am using a ConcurrentDictionary to store log-lines, and when I need to display them to the user I call ToList() to generate a list. But the weird thing is that some users receive the most recent lines first in the list, while they should logically be last.

Is this because ConcurrentDictionary doesnt guarantee a persistent order on the IEnumerate interface, or what can be the reason?

解决方案

No ConcurrentDictionary (and Dictionary<T> for that matter) does not guarantee the ordering of the keys in the list. You'll have to use a different data type or perform the sorting yourself. For non-concurrent code you would use SortedDictionary<T>, but I don't believe there is an analogue in the concurrent collections.

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