Concurrent dictionary thread safe

Im using MVC3. 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

Re: Concurrent dictionary thread safe

only adding or fetching a reference from the dictionary is thread safe. you must make sure the item stored in the dictionary is thread and accessing the properties is thead safe. strings because they are imutable are thread safe for this use.

Re: Concurrent dictionary thread safe

thanks for your reply but I dont think that answers my question.I just gave an example by using string. I may using IList. anyway the question was which of the two methods I mentioned are thread safe? Thanks

Re: Concurrent dictionary thread safe

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

Yes they are thread safe. The ConcurrentDictionary class internally uses Monitor(C# lock). You can see this for understanding why normal dictionaries are not thread safe.

Re: Concurrent dictionary thread safe

Please look at this post as this addresses how the contents are not threadsafe in regards to AddOrUpdate() and the concurrent dictionary. Yes the concurrentdictionary is threadsafe and in most situations you will not encounter an issue but be sure to read how threadsafe was defined.