Using System.Collections.Concurrent.ConcurrentQueue with notifications

Get the latest version of source code from Codeplex

Or get it from NUGET:

PM> Install-Package ObservableConcurrentQueue

if you are not familiar with ConcurrentQueue, Read more about it on MSDN

var observableConcurrentQueue = new ObservableConcurrentQueue();

var observableConcurrentQueue = new ObservableConcurrentQueue(true);

According to Mircosoft Documentation All public and protected members of ConcurrentQueue<T> are thread-safe and may be used concurrently from multiple threads. This additional Thread Safe option is just for some customization stuff.

observableConcurrentQueue.ContentChanged += OnObservableConcurrentQueueContentChanged;

private static void OnObservableConcurrentQueueContentChanged(
 object sender,
 NotifyConcurrentQueueChangedEventArgs args)
 {
      // Item Added
      if (args.Action == NotifyConcurrentQueueChangedAction.Enqueue)
      {
          Console.WriteLine("New Item added: {0}", args.ChangedItem);
      }
 
      // Item deleted
      if (args.Action == NotifyConcurrentQueueChangedAction.Dequeue)
      {
          Console.WriteLine("New Item deleted: {0}", args.ChangedItem);
      }
 
      // Item peeked
      if (args.Action == NotifyConcurrentQueueChangedAction.Peek)
      {
           Console.WriteLine("Item peeked: {0}", args.ChangedItem);
      }
 
      // Queue Empty
      if (args.Action == NotifyConcurrentQueueChangedAction.Empty)
      {
           Console.WriteLine("Queue is empty");
      }
 } 

Once the handler is defined, we can start adding, deleting or getting elements from the concurrentQueue, and after each operation an event will be raised and handled by the method above.

The EventArgs object sent by the event contains 2 properties:

• Enqueue: If a new item has been enqueued.
• Dequeue: an item has been dequeued.
• Peek: an item has been peeked.
• Empty: The last element in the queue has been dequeued and the queue is empty.

The item which the changes applied on. can be null if the notification action is NotifyConcurrentQueueChangedAction.Empty.

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