MailboxProcessor.Post<'Msg> Method (F#)

  • Article

Posts a message to the message queue of the MailboxProcessor, asynchronously.

Namespace/Module Path: Microsoft.FSharp.Control

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

// Signature:
member this.Post : 'Msg -> unit

// Usage:
mailboxProcessor.Post (message)

Parameters

  • message
    Type: 'Msg

    The message to post.

Example

The following code example shows how to start a mailbox processor agent and post messages to it.

open System
open Microsoft.FSharp.Control

type Message(id, contents) =
    static let mutable count = 0
    member this.ID = id
    member this.Contents = contents
    static member CreateMessage(contents) =
        count <- count + 1
        Message(count, contents)

let mailbox = new MailboxProcessor<Message>(fun inbox ->
    let rec loop count =
        async { printfn "Message count = %d. Waiting for next message." count
                let! msg = inbox.Receive()
                printfn "Message received. ID: %d Contents: %s" msg.ID msg.Contents
                return! loop( count + 1) }
    loop 0)

mailbox.Start()

mailbox.Post(Message.CreateMessage("ABC"))
mailbox.Post(Message.CreateMessage("XYZ"))


Console.WriteLine("Press any key...")
Console.ReadLine() |> ignore

Following is an example session.

Press any key...
Message count = 0. Waiting for next message.
Message received. ID: 1 Contents: ABC
Message count = 1. Waiting for next message.
Message received. ID: 2 Contents: XYZ
Message count = 2. Waiting for next message.

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.MailboxProcessor<'Msg> Class (F#)

Microsoft.FSharp.Control Namespace (F#)

Change History

Date

History

Reason

January 2011

Added code example.

Information enhancement.