Differences between Hashtable vs Dictonary vs ConcurrentDictionary vs ImmutableDictionary

I'm very much enjoying David Fowler's tweets, and since he doesn't have a blog, I will continue to share and expand on his wisdom so that it might reach a larger audience. He points out that ".NET has 4 built-in dictionary/map types [and] there’s no guidance on when to use what, mostly individual documentation on each implementation." Hashtable Dictionary ConcurrentDictionary ImmutableDictionary There is actually some good documentation on C# Collections and Data Structures here that we can c...

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