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Task<TResult>.ContinueWith Method (Action<Task<TResult>, Object>, Object, CancellationToken)

.NET Framework 4.6 and 4.5

Creates a continuation that executes when the target Task<TResult> completes.

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

public Task ContinueWith(
	Action<Task<TResult>, object> continuationAction,
	object state,
	CancellationToken cancellationToken


Type: System.Action<Task<TResult>, Object>

An action to run when the Task<TResult> completes. When run, the delegate will be passed the completed task and the caller-supplied state object as arguments.

Type: System.Object

An object representing data to be used by the continuation action.

Type: System.Threading.CancellationToken

The CancellationToken that will be assigned to the new continuation task.

Return Value

Type: System.Threading.Tasks.Task

A new continuation Task.

Exception Condition

The continuationAction argument is null.


The provided CancellationToken has already been disposed.

The returned Task will not be scheduled for execution until the current task has completed, whether it completes due to running to completion successfully, faulting due to an unhandled exception, or exiting out early due to being canceled.

Universal Windows Platform
Available since 4.5
.NET Framework
Available since 4.5
Portable Class Library
Supported in: portable .NET platforms
Windows Phone Silverlight
Available since 8.0
Windows Phone
Available since 8.1
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