共用方式為


MailboxProcessor.Start<'Msg> 方法 (F#)

建立並啟動代理程式。

命名空間/模組路徑:Microsoft.FSharp.Control

組件:FSharp.Core (在 FSharp.Core.dll 中)

// Signature:
static member Start : (MailboxProcessor<'Msg> -> Async<unit>) * ?CancellationToken -> MailboxProcessor<'Msg>

// Usage:
MailboxProcessor.Start (body)
MailboxProcessor.Start (body, cancellationToken = cancellationToken)

參數

傳回值

建立的 MailboxProcessor

備註

body 函式會用來產生由代理程式執行的非同步計算。

範例

下列程式碼範例示範如何啟動信箱處理器代理程式。在此範例中,主控台輸入的每一行將被發送到訊息佇列中。程式會讀取每個訊息,並使用回覆通道回覆。當收到「停止」訊息時,就會傳送停止回覆並結束程式。

open System

type Message = string * AsyncReplyChannel<string>

let formatString = "Message number {0} was received. Message contents: {1}"

let printThreadId note =

    // Append the thread ID.
    printfn "%d : %s" System.Threading.Thread.CurrentThread.ManagedThreadId note


let agent = MailboxProcessor<Message>.Start(fun inbox ->
    let rec loop n =
        async {
                let! (message, replyChannel) = inbox.Receive();
                printThreadId "MailboxProcessor"
                if (message = "Stop") then
                    replyChannel.Reply("Stopping.")
                else
                    replyChannel.Reply(String.Format(formatString, n, message))
                do! loop (n + 1)
        }
    loop 0)

printfn "Mailbox Processor Test"
printfn "Type some text and press Enter to submit a message."
printfn "Type 'Stop' to close the program."

let rec loop() =
    printf "> "
    let input = Console.ReadLine()
    printThreadId("Console loop")
    let reply = agent.PostAndReply(fun replyChannel -> input, replyChannel)
    if (reply <> "Stopping.") then
        printfn "Reply: %s" reply
        loop()
    else
        ()
loop()

printfn "Press Enter to continue."
Console.ReadLine() |> ignore

下列為範例工作階段。

  
  
  
  
  
  
  
  
  

平台

Windows 8 中, Windows 7, Windows Server 2012 上, Windows Server 2008 R2

版本資訊

F# 核心程式庫版本

支援版本:2.0, 4.0,可攜式執行檔 (PE)。

請參閱

參考

Control.MailboxProcessor<'Msg> 類別 (F#)

Microsoft.FSharp.Control 命名空間 (F#)