ConcurrentDictionary

Question

I have a question about ConcurrentDictionary.

I have the following:

public ConcurrentDictionary<String, String> myDictionary;

There are two ways of adding data.

myDictionary["SomeKey"] = "Some value"

and

myDictionary.TryAdd("SomeKey", "Some value");

Are both method threadsafe. I mean if two processes try to access the dictionary at the same time, it will not throw an exception?

Thanks

Vulpes · Answer

Yes both methods of adding items to the dictionary are threadsafe in that they can do so without the need for locks though they do use locks internally. They'll only throw exceptions if the key is null or the maximum number of elements would otherwise be exceeded. The only difference between them is that if the key already exists the indexer's setter will update its value. TryAdd will do nothing in this scenario except return false.

Antonios Dev · Answer

Thank you very much