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

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)

Public Function ContinueWhenAll(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.


Type: System.Threading.Tasks.Task()

The array of tasks from which to continue.

Type: System.Func(Of Task(), TResult)

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

Type: System.Threading.Tasks.TaskContinuationOptions

A bitwise combination of the enumeration values that control the behavior of the new continuation task. The NotOn* and OnlyOn* members are not supported.

Return Value

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


An element in the tasks array has been disposed.


The tasks array is Nothing.


The continuationFunction argument is Nothing.


The continuationOptions argument specifies an invalid value.


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

Portable Class Library

Supported in: Portable Class Library

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8
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