CancellationTokenTaskSource`1 Holds the task for a cancellation token, as well as the token registration. The registration is disposed when this instance is disposed.

 SynchronizationContextSwitcher Utility class for temporarily switching implementations.

 SynchronizationContextExtensions Provides extension methods for .

 TaskCompletionSourceExtensions Provides extension methods for .

 TaskConstants Provides completed task constants.

 TaskConstants`1 Provides completed task constants.

 TaskExtensions Provides extension methods for the and types.

 TaskFactoryExtensions Provides extension methods for task factories.