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TaskFactory(Of TResult).StartNew Method (Func(Of TResult), CancellationToken, TaskCreationOptions, TaskScheduler)

Creates and starts a task.

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

'Declaration
Public Function StartNew ( _
	function As Func(Of TResult), _
	cancellationToken As CancellationToken, _
	creationOptions As TaskCreationOptions, _
	scheduler As TaskScheduler _
) As Task(Of TResult)

Parameters

function
Type: System.Func(Of TResult)

A function delegate that returns the future result to be available through the task.

cancellationToken
Type: System.Threading.CancellationToken

The cancellation token that will be assigned to the new task.

creationOptions
Type: System.Threading.Tasks.TaskCreationOptions

One of the enumeration values that controls the behavior of the created task.

scheduler
Type: System.Threading.Tasks.TaskScheduler

The task scheduler that is used to schedule the created task.

Return Value

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

ExceptionCondition
ObjectDisposedException

The cancellation token source that createdcancellationToken has already been disposed.

ArgumentNullException

The function argument is Nothing.

-or-

The scheduler argument is Nothing.

ArgumentOutOfRangeException

The creationOptions parameter specifies an invalid value.

Calling StartNew is functionally equivalent to creating a task by using one of the Task(Of TResult) constructors and then calling the Start method to schedule it for execution.

However, unless creation and scheduling must be separated, StartNew is the recommended approach for both simplicity and performance.

.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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