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

Creates and starts a Task(Of TResult).

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

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

Type Parameters

TResult

The type of the result available through the Task(Of TResult).

Parameters

function
Type: System.Func(Of TResult)

A function delegate that returns the future result to be available through the Task(Of TResult).

cancellationToken
Type: System.Threading.CancellationToken

The CancellationToken that will be assigned to the new Task

Return Value

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

ExceptionCondition
ObjectDisposedException

The provided CancellationToken has already been disposed.

ArgumentNullException

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

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

Starting with the .NET Framework 4.5, you can use the Run method with an Action object as a quick way to call StartNew with default parameters. For more information and code examples, see the entry Task.Run vs. Task.Factory.StartNew in the Parallel Programming with .NET blog.

.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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