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

July 28, 2014

Creates and starts a Task<TResult>.

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

public Task<TResult> StartNew<TResult>(
	Func<TResult> function
)

Type Parameters

TResult

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

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>.

ExceptionCondition
ArgumentNullException

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.

This example demonstrates retrieving the asynchronous result generated by a task.

// C#

var pi = Task<string>.Factory.StartNew(() => ComputePi(numDigits));

...

Console.WriteLine(pi.Result);

' Visual Basic

Dim pi = Task(Of String).Factory.StartNew(Function() ComputePi(numDigits))

...

Console.WriteLine(pi.Result)

Windows Phone OS

Supported in: 8.1, 8.0

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