TaskScheduler.TryDequeue Method

Attempts to dequeue a Task that was previously queued to this scheduler.

Namespace:  System.Threading.Tasks
Assembly:  mscorlib (in mscorlib.dll)

protected internal virtual bool TryDequeue(
	Task task


Type: System.Threading.Tasks.Task

The Task to be dequeued.

Return Value

Type: System.Boolean
A Boolean denoting whether the task argument was successfully dequeued.


The task argument is null.

For more information, see Task Schedulers.

This method may execute in a finally block; therefore it should return as quickly as possible so that any resources such as CancellationTokenRegistration objects can be disposed of in a timely manner.

.NET Framework

Supported in: 4.5, 4

.NET Framework Client Profile

Supported in: 4

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Windows Phone 8.1, Windows Phone 8, 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.

Was this page helpful?
(1500 characters remaining)
Thank you for your feedback
© 2014 Microsoft