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I have the following ConcurrentDictionary:
ConcurrentDictionary<Guid, Session> sessions;
I know that sessions.TryGetValue(key, out session) is thread-safe, but my question is if sessions[key] is also thread-safe?
sessions.TryGetValue(key, out session) returns true or false depending on whether it was able to get the value or not.
Will sessions[key] return null if it is unable to get the value? I would think so. Can anyone confirm or shed more light on this? Thanks.
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TryGetValue itself is thread-safe... it does not make the if statement thread-safe... in the example your show you need the lock . Thanks for clearing that up.
Concurrent. ConcurrentDictionary<TKey,TValue>. This collection class is a thread-safe implementation. We recommend that you use it whenever multiple threads might be attempting to access the elements concurrently.
It is thread-safe in the sense that the internal state of the ConcurrentDictionary will not be corrupted. This is the main guarantee offered by this class.
ConcurrentDictionary is thread-safe collection class to store key/value pairs. It internally uses locking to provide you a thread-safe class. It provides different methods as compared to Dictionary class. We can use TryAdd, TryUpdate, TryRemove, and TryGetValue to do CRUD operations on ConcurrentDictionary.
It is thread-safe, but it will not return null.
The documentation clearly states:
Exceptions
KeyNotFoundException
The property is retrieved and key does not exist in the collection.
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