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What is ConcurrentDictionary?
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.
Are C# dictionaries thread-safe?
Dictionary Class A Dictionary can support multiple readers concurrently, as long as the collection is not modified. Even so, enumerating through a collection is intrinsically not a thread-safe procedure.
Why do we need thread-safe?
Thread safety simply ensures that when a thread is modifying or reading shared data, no other thread can access it in a way that changes the data. If your code depends on a certain order for execution for correctness, then you need other synchronization mechanisms beyond those required for thread safety to ensure this.
Is the concurrentdictionary Dictionary safe for multiple threads?
ConcurrentDictionary is a thread-safe dictionary implementation but surprisingly (at least to me) not all of its members can be safely used by multiple threads concurrently. The Thread Safety section on the ConcurrentDictionary MSDN article has this to say:
Is the concurrentdictionary < TKey, TValue > thread safe?
However, members accessed through one of the interfaces the ConcurrentDictionary implements, including extension methods, are not guaranteed to be thread safe and may need to be synchronized by the caller.
How to add and remove data in concurrentdictionary?
ConcurrentDictionary provides several convenience methods that make it unnecessary for code to first check whether a key exists before it attempts to add or remove data. The following table lists these convenience methods and describes when to use them.
Is it possible to make a dictionary thread safe?
Yes, it is thread safe and yes it avoids you using locks all over the place (whatever that means). Of course that will only provide you a thread safe access to the data stored in this dictionary, but if the data itself is not thread safe then you need to synchronize access to it of course.