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TaskFactory.ContinueWhenAll(TAntecedentResult) Method (Task(TAntecedentResult)[], Action(Task(TAntecedentResult)[]), CancellationToken)

Creates a continuation task that starts when a set of specified tasks has completed.

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

member ContinueWhenAll : 
        tasks:Task<'TAntecedentResult>[] * 
        continuationAction:Action<Task<'TAntecedentResult>[]> * 
        cancellationToken:CancellationToken -> Task

Type Parameters


The type of the result of the antecedent tasks.


Type: System.Threading.Tasks.Task(TAntecedentResult)[]

The array of tasks from which to continue.

Type: System.Action(Task(TAntecedentResult)[])

The action delegate to execute when all tasks in the tasks array have completed.

Type: System.Threading.CancellationToken

The cancellation token to assign to the new continuation task.

Return Value

Type: System.Threading.Tasks.Task
The new continuation task.


An element in the tasks array has been disposed.


The CancellationTokenSource that created cancellationToken has already been disposed.


The tasks array is a null reference (Nothing in Visual Basic).


The continuationAction argument is a null reference (Nothing in Visual Basic).


The tasks array is empty or contains a null value.

.NET Framework

Supported in: 4.6, 4.5, 4

.NET Framework Client Profile

Supported in: 4

.NET for Windows Phone apps

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

Portable Class Library

Supported in: Portable Class Library
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