Windows apps
Collapse the table of content
Expand the table of content

TaskFactory.StartNew Method (Action, TaskCreationOptions)


Creates and starts a Task.

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

public Task StartNew(
	Action action,
	TaskCreationOptions creationOptions


Type: System.Action

The action delegate to execute asynchronously.

Type: System.Threading.Tasks.TaskCreationOptions

A TaskCreationOptions value that controls the behavior of the created Task

Return Value

Type: System.Threading.Tasks.Task

The started Task.

Exception Condition

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


The exception that is thrown when the creationOptions argument specifies an invalid TaskCreationOptions value.

Calling StartNew is functionally equivalent to creating a Task 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 Task.Run vs Task.Factory.StartNew in the Parallel Programming with .NET blog.

Universal Windows Platform
Available since 8
.NET Framework
Available since 4.0
Portable Class Library
Supported in: portable .NET platforms
Available since 5.0
Windows Phone Silverlight
Available since 8.0
Windows Phone
Available since 8.1
Return to top
© 2016 Microsoft