Register Method (Action(Object), Object)
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CancellationToken.Register Method (Action<Object>, Object)

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

Registers a delegate that will be called when this CancellationToken is canceled.

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

public CancellationTokenRegistration Register(
	Action<Object> callback,
	Object state
)

Parameters

callback
Type: System.Action<Object>
The delegate to be executed when the CancellationToken is canceled.
state
Type: System.Object
The state to pass to the callback when the delegate is invoked. This may be null.

Return Value

Type: System.Threading.CancellationTokenRegistration
The CancellationTokenRegistration instance that can be used to deregister the callback.

ExceptionCondition
ObjectDisposedException

The associated CancellationTokenSource has been disposed.

ArgumentNullException

callback is null.

If this token is already in the canceled state, the delegate will be run immediately and synchronously. Any exception the delegate generates will be propogated out of this method call.

Windows Phone OS

Supported in: 8.1, 8.0

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