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Task.WaitAll Method (Task[], CancellationToken)

.NET Framework 4.5

Waits for all of the provided cancellable Task objects to complete execution.

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

public static void WaitAll(
	Task[] tasks,
	CancellationToken cancellationToken
)

Parameters

tasks: Type: System.Threading.Tasks.Task[]
An array of Task instances on which to wait.

cancellationToken: Type: System.Threading.CancellationToken
A CancellationToken to observe while waiting for the tasks to complete.

Exceptions

Exception	Condition
OperationCanceledException	The cancellationToken was canceled.
ArgumentNullException	The tasks argument is null.
AggregateException	At least one of the Task instances was canceled -or- an exception was thrown during the execution of at least one of the Task instances. If a task was canceled, the AggregateException contains an OperationCanceledException in its InnerExceptions collection.
ArgumentException	The tasks argument contains a null element.
ObjectDisposedException	One or more of the Task objects in tasks has been disposed.

Remarks

The cancellationToken argument is used to cancel the wait operation. If it is canceled, the Wait returns false (False in Visual Basic). Cancellation of the tasks is a distinct operation, and is signaled by the AggregateException as noted above.

Version Information

.NET Framework

Supported in: 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

Platforms

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.

Reference

Task Class

WaitAll Overload

System.Threading.Tasks Namespace

Other Resources

Task Parallel Library (TPL)

Task Parallelism (Task Parallel Library)

How to: Wait on One or More Tasks to Complete

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