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TaskFactory.ContinueWhenAny(Of TResult) Method (Task(), Func(Of Task, TResult), TaskContinuationOptions)

Creates a continuation Task(Of TResult) that will be started upon the completion of any Task in the provided set.

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

Public Function ContinueWhenAny(Of TResult) ( _
	tasks As Task(), _
	continuationFunction As Func(Of Task, TResult), _
	continuationOptions As TaskContinuationOptions _
) As Task(Of TResult)

Type Parameters


The type of the result that is returned by the continuationFunction delegate and associated with the created Task(Of TResult).


Type: System.Threading.Tasks.Task()

The array of tasks from which to continue when one task completes.

Type: System.Func(Of Task, TResult)

The function delegate to execute asynchronously when one task in the tasks array completes.

Type: System.Threading.Tasks.TaskContinuationOptions

The TaskContinuationOptions value that controls the behavior of the created continuation Task(Of TResult).

Return Value

Type: System.Threading.Tasks.Task(Of TResult)
The new continuation Task(Of TResult).


The exception that is thrown when one of the elements in the tasks array has been disposed.


The exception that is thrown when the tasks array is null.


The exception that is thrown when the continuationFunction argument is null.


The exception that is thrown when the continuationOptions argument specifies an invalid TaskContinuationOptions value.


The exception that is thrown when the tasks array contains a null value.


The exception that is thrown when the tasks array is empty.

The NotOn* and OnlyOn* TaskContinuationOptions, which constrain for which TaskStatus states a continuation will be executed, are illegal with ContinueWhenAny.

.NET Framework

Supported in: 4.6, 4.5, 4

.NET Framework Client Profile

Supported in: 4

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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