Task.WaitAll Method (Task[], Int32, CancellationToken)

Waits for all of the provided cancellable Task objects to complete execution within a specified number of milliseconds.

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

public static bool WaitAll(
	Task[] tasks,
	int millisecondsTimeout,
	CancellationToken cancellationToken
)

Parameters

tasks
Type: System.Threading.Tasks.Task[]

An array of Task instances on which to wait.

millisecondsTimeout
Type: System.Int32

The number of milliseconds to wait, or Infinite (-1) to wait indefinitely.

cancellationToken
Type: System.Threading.CancellationToken

A CancellationToken to observe while waiting for the tasks to complete.

Return Value

Type: System.Boolean
true if all of the Task instances completed execution within the allotted time; otherwise, false.

ExceptionCondition
ObjectDisposedException

One or more of the Task objects in tasks has been disposed.

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.

ArgumentOutOfRangeException

millisecondsTimeout is a negative number other than -1, which represents an infinite time-out.

ArgumentException

The tasks argument contains a null element.

OperationCanceledException

The cancellationToken was canceled.

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.

.NET Framework

Supported in: 4.5.2, 4.5.1, 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

.NET for Windows Phone apps

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

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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