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Task.Run(TResult) Method (Func(TResult), CancellationToken)

.NET Framework 4.5

Queues the specified work to run on the thread pool and returns a Task(TResult) handle for that work.

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

static member Run : 
        function:Func<'TResult> * 
        cancellationToken:CancellationToken -> Task<'TResult> 

Type Parameters


The result type of the task.


Type: System.Func(TResult)

The work to execute asynchronously

Type: System.Threading.CancellationToken

A cancellation token that should be used to cancel the work

Return Value

Type: System.Threading.Tasks.Task(TResult)
A Task(TResult) that represents the work queued to execute in the ThreadPool.


The function parameter was a null reference (Nothing in Visual Basic).


The task has been canceled.


The CancellationTokenSource associated with cancellationToken was disposed.

The Run method is a simpler alternative to the StartNew method. It creates a task with the following default values:

.NET Framework

Supported in: 4.5

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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