Task<TResult>::ContinueWith Method (Action<Task<TResult>^>^)


Creates a continuation that executes asynchronously when the target task completes.

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

Task^ ContinueWith(
	Action<Task<TResult>^>^ continuationAction


Type: System::Action<Task<TResult>^>^

An action to run when the antecedent Task<TResult> completes. When run, the delegate will be passed the completed task as an argument.

Return Value

Type: System.Threading.Tasks::Task^

A new continuation task.

Exception Condition

The Task<TResult> has been disposed.


The continuationAction argument is null.

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 early due to being canceled.

The following example creates an antecedent task that uses the Sieve of Eratosthenes to calculate the prime numbers between 1 and a value entered by the user. An array is used to hold information about the prime numbers. The array index represents the number, and the element's value indicates whether that number is composite (its value is true) or prime (its value is false). This task is then passed to a continuation task, which is responsible for extracting the prime numbers from the integer array and displaying them.

No code example is currently available or this language may not be supported.

Universal Windows Platform
Available since 8
.NET Framework
Available since 4.0
Portable Class Library
Supported in: portable .NET platforms
Available since 5.0
Windows Phone Silverlight
Available since 8.0
Windows Phone
Available since 8.1
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