StartNew(TResult) Method (Func(Object, TResult), Object, CancellationToken)

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

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

Creates and starts a Task<TResult>.

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

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

Type Parameters


The type of the result available through the Task<TResult>.


Type: System.Func<Object, TResult>
A function delegate that returns the future result to be available through the Task<TResult>.
Type: System.Object
An object containing data to be used by the function delegate.
Type: System.Threading.CancellationToken
The CancellationToken that will be assigned to the new Task

Return Value

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


The provided CancellationToken has already been disposed.


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

Calling StartNew is functionally equivalent to creating a Task<TResult> 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.

Windows Phone OS

Supported in: 8.1, 8.0

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