This documentation is archived and is not being maintained.

TaskFactory.StartNew<TResult> Method (Func<TResult>, CancellationToken)

Creates and starts a task.

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

public Task<TResult> StartNew<TResult>(
	Func<TResult> function,
	CancellationToken cancellationToken

Type Parameters


The type of the result available through the created task.


Type: System.Func<TResult>
A function delegate that returns the future result to be available through the created task.
Type: System.Threading.CancellationToken
The cancellation token that will be assigned to the new task

Return Value

Type: System.Threading.Tasks.Task<TResult>
The started task.


The provided CancellationToken has already been disposed.


The function argument is null.

Calling StartNew is functionally equivalent to creating a task using one of its constructors and then calling Start 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

.NET Framework Client Profile

Supported in: 4

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.