Export (0) Print
Expand All

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

Creates and starts a Task(TResult).

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

member StartNew : 
        function:Func<Object, 'TResult> * 
        state:Object * 
        cancellationToken:CancellationToken -> Task<'TResult> 

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.

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: 4.6, 4.5, 4

.NET Framework Client Profile

Supported in: 4

Portable Class Library

Supported in: Portable Class Library

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8
© 2015 Microsoft