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My understanding is that if you are using a generic list (List) in C#, that it can support multiple concurrent readers but only one writer. And when you introduce a writer into the mix, you must also provide synchronization constructs to make the operations thread safe.
Is List.Contains considered a read operation? In other words, if I am calling this method, do I need to worry that a writer may be writing to this List at the same time?
Yes, you should. Basically I would synchronize for any operation if the list might be used for writing at the same time.
Generally I find collections fall into two categories – ones which are created, initialized and then never changed again (thread-safe), and ones which are mutated over time (not thread-safe, lock for all access).