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Control.Async<'T> Type (F#)

A compositional asynchronous computation, which, when run, will eventually produce a value of type 'T, or else raises an exception. The functions for working with these objects are in the Async class.

Namespace/Module Path: Microsoft.FSharp.Control

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

[<Sealed>]
[<NoEquality>]
[<NoComparison>]
type Async<'T> =
 class
 end

Asynchronous computations are normally specified using an F# computation expression. When run, asynchronous computations have two modes: as a work item (executing synchronous code), or as a wait item (waiting for an event or I/O completion). When run, asynchronous computations can be governed by CancellationToken. This can usually be specified when the asynchronous computation is started. The associated CancellationTokenSource may be used to cancel the asynchronous computation. Asynchronous computations built using computation expressions can check the cancellation condition regularly. Synchronous computations within an asynchronous computation do not automatically check this condition. For more information, see Asynchronous Workflows (F#).

This type is named [FSharpAsync] in compiled assemblies. If you are accessing the type from a language other than F#, or through reflection, use this name.

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

F# Runtime

Supported in: 2.0, 4.0

Silverlight

Supported in: 3

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