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TaskFactory.ContinueWhenAll<TAntecedentResult, TResult> Method (Task<TAntecedentResult>[], Func<Task<TAntecedentResult>[], TResult>, CancellationToken, TaskContinuationOptions, TaskScheduler)

July 28, 2014

Creates a continuation Task<TResult> that will be started upon the completion of a set of provided Tasks.

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

public Task<TResult> ContinueWhenAll<TAntecedentResult, TResult>(
	Task<TAntecedentResult>[] tasks,
	Func<Task<TAntecedentResult>[], TResult> continuationFunction,
	CancellationToken cancellationToken,
	TaskContinuationOptions continuationOptions,
	TaskScheduler scheduler
)

Type Parameters

TAntecedentResult

The type of the result of the antecedent tasks.

TResult

The type of the result that is returned by the continuationFunction delegate and associated with the created Task<TResult>.

Parameters

tasks
Type: System.Threading.Tasks.Task<TAntecedentResult> []
The array of tasks from which to continue.
continuationFunction
Type: System.Func< Task<TAntecedentResult> [], TResult>
The function delegate to execute asynchronously when all tasks in the tasks array have completed.
cancellationToken
Type: System.Threading.CancellationToken
The CancellationToken that will be assigned to the new continuation task.
continuationOptions
Type: System.Threading.Tasks.TaskContinuationOptions
The TaskContinuationOptions value that controls the behavior of the created continuation Task<TResult>.
scheduler
Type: System.Threading.Tasks.TaskScheduler
The TaskScheduler that is used to schedule the created continuation Task<TResult>.

Return Value

Type: System.Threading.Tasks.Task<TResult>
The new continuation Task<TResult>.

ExceptionCondition
ArgumentNullException

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

-or-

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

-or-

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

ArgumentException

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

-or-

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

ArgumentOutOfRangeException

The exception that is thrown when the continuationOptions argument specifies an invalid TaskContinuationOptions value. The exception that is thrown when the creationOptions argument specifies an invalid TaskCreationOptions value. For more information, see the Remarks for FromAsync

ObjectDisposedException

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

-or-

The CancellationTokenSource that created cancellationToken has already been disposed.

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

Windows Phone OS

Supported in: 8.1, 8.0

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