Task.Run Method (Action)

.NET Framework 4.5

Queues the specified work to run on the ThreadPool and returns a task handle for that work.

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

static member Run : 
        action:Action -> Task


Type: System.Action

The work to execute asynchronously

Return Value

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


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

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

The following example illustrates the Run(Action) method. It defines an array of directory names and starts a separate task to retrieve the file names in each directory. All tasks write the file names to a single ConcurrentBag(T) object. The example then calls the WaitAll(Task[]) method to ensure that all tasks have completed, and then displays a count of the total number of file names written to the ConcurrentBag(T) object.

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

.NET Framework

Supported in: 4.6, 4.5

.NET for Windows Store apps

Supported in: Windows 8

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: 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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