Async.Start Method (F#)

Starts the asynchronous computation in the thread pool. Do not await its result.

Namespace/Module Path: Microsoft.FSharp.Control

Assembly: FSharp.Core (in FSharp.Core.dll)

// Signature:
static member Start : Async<unit> * ?CancellationToken -> unit

// Usage:
Async.Start (computation)
Async.Start (computation, cancellationToken = cancellationToken)

Parameters

• computation
  Type: Async<unit>

  The computation to run asynchronously.

• cancellationToken
  Type: CancellationToken

  The cancellation token to be associated with the computation. If one is not supplied, the default cancellation token is used.

Remarks

If no cancellation token is provided then the default cancellation token is used.

Example

The following code example shows how to start an asynchronous computation on the thread pool.

open System.Windows.Forms

let bufferData = Array.zeroCreate<byte> 100000000

let async1 =
     async {
       use outputFile = System.IO.File.Create("longoutput.dat")
       do! outputFile.AsyncWrite(bufferData) 
     }


let form = new Form(Text = "Test Form")
let button = new Button(Text = "Start")
form.Controls.Add(button)
button.Click.Add(fun args -> Async.Start(async1))
Application.Run(form)

Platforms

Windows 7, Windows Vista SP2, Windows XP SP3, Windows XP x64 SP2, Windows Server 2008 R2, Windows Server 2008 SP2, Windows Server 2003 SP2

Version Information

F# Runtime

Supported in: 2.0, 4.0

Silverlight

Supported in: 3

See Also

Reference

Control.Async Class (F#)

Microsoft.FSharp.Control Namespace (F#)