Make your collections thread-safe in C#

The .NET Framework 4 brought the System.Collections.Concurrent namespace. This has several collection classes that are thread-safe and scalable. These collections are called concurrent collections because they can be accessed by multiple threads at a time.

The following concurrent collection types use lightweight synchronization mechanisms: SpinLock, SpinWait, etc. These are new in .NET Framework 4.

Let us see the concurrent collection in C# −

Type Description
BlockingCollection<T> Bounding and blocking functionality for any type.
ConcurrentDictionary<TKey,TValue> Thread-safe implementation of a dictionary of key-value pairs.
ConcurrentQueue<T> Thread-safe implementation of a FIFO (first-in, first-out) queue.
ConcurrentStack<T> Thread-safe implementation of a LIFO (last-in, first-out) stack.
ConcurrentBag<T> Thread-safe implementation of an unordered collection of elements.
IProducerConsumerCollection<T> The interface that a type must implement to be used in a BlockingCollection

Let us see how to work with ConcurrentStack<T> that is a thread-safe last in-first out (LIFO) collection −

ConcurrentStack<int> cs = new ConcurrentStack<int>();

Updated on: 30-Jul-2019


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