ConcurrentQueue(Of T).TryDequeue Method
Tries to remove and return the object at the beginning of the concurrent queue.
Assembly: mscorlib (in mscorlib.dll)
'Declaration Public Function TryDequeue ( _ <OutAttribute> ByRef result As T _ ) As Boolean
- Type: T
When this method returns, if the operation was successful, result contains the object removed. If no object was available to be removed, the value is unspecified.
ConcurrentQueue(Of T) handles all synchronization internally. If two threads call at precisely the same moment, neither operation is blocked. When a conflict is detected between two threads, one thread has to try again to retrieve the next element, and the synchronization is handled internally.
tries to remove an element from the queue. If the method is successful, the item is removed and the method returns true; otherwise, it returns false. That happens atomically with respect to other operations on the queue. If the queue was populated with code such as q.Enqueue("a"); q.Enqueue("b"); q.Enqueue("c"); and two threads concurrently try to dequeue an element, one thread will dequeue a and the other thread will dequeue b. Both calls to will return true, because they were both able to dequeue an element. If each thread goes back to dequeue an additional element, one of the threads will dequeue c and return true, whereas the other thread will find the queue empty and will return false.
Windows Phone 8.1, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.