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Async.Start Method (F#)

Visual Studio 2010

Other Versions

Visual Studio 11

Updated: July 2010

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)

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// 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.

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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)