Is the list order of a ConcurrentDictionary guaranteed?
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? 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