TaskFactory::StartNew<TResult> Method (Func<TResult>^)

.NET Framework (current version)

Creates and starts a Task<TResult>.

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

Syntax

public:
generic<typename TResult>
Task<TResult>^ StartNew(
	Func<TResult>^ function
)

Parameters

function: Type: System::Func<TResult>^
A function delegate that returns the future result to be available through the Task<TResult>.

Return Value

Type: System.Threading.Tasks::Task<TResult>^

The started Task<TResult>.

Type Parameters

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

Exceptions

Exception	Condition
ArgumentNullException	The function argument is null.

Remarks

Calling StartNew<TResult> 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 call the Task::Run<TResult>(Func<TResult>^) method as a quick way to call StartNew with default parameters. Note, however, that there is a difference in behavior between the two methods regarding : Task::Run<TResult>(Func<TResult>^) by default does not allow child tasks started with the TaskCreationOptions::AttachedToParent option to attach to the current Task<TResult> instance, whereas StartNew<TResult>(Func<TResult>^) does. For more information and code examples, see the entry Task.Run vs. Task.Factory.StartNew in the Parallel Programming with .NET blog.

Examples

The following example is a simple addition app that generates two random numbers and prompts the user to enter their sum. It then indicates whether the answer is correct or, if the user's response is not a valid number, prompts the user to re-enter a valid number. The StartNew<TResult> is used to create the Task<TResult> objects that return the random numbers to add.

C++

No code example is currently available or this language may not be supported.

Version Information

Universal Windows Platform
Available since 8
.NET Framework
Available since 4.0
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 5.0
Windows Phone Silverlight
Available since 8.0
Windows Phone
Available since 8.1