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A ConcurrentBag will allow multiple threads to add and remove items from the bag. It is possible that a thread will add an item to the bag and then end up taking that same item right back out. It says that the ConcurrentBag is unordered, but how unordered is it? On a single thread, the bag acts like a Stack. Does unordered mean “not like a linked list”?
What is a real world use for ConcurrentBag?
Bags are really useful for tracking instance counts. For example, if you want to keep a record of which hosts you’re servicing web requests for, you can add their IP to the bag when you start servicing the request, and remove it when done.
Using a bag will allow you to tell at a glance which IPs you’re currently servicing. It will also let you quickly query whether you’re servicing a given IP address.
If you use a set for this rather than a bag, then having multiple concurrent requests from the same IP address will mess up your record-keeping.