MailboxProcessor.Error<'Msg> Property (F#)
Visual Studio 2012
Occurs when the execution of the agent results in an exception.
Namespace/Module Path: Microsoft.FSharp.Control
Assembly: FSharp.Core (in FSharp.Core.dll)
// Signature: member this.Error : IEvent<Exception> // Usage: mailboxProcessor.Error
The error event as an object that implements IEvent
The following code shows how to use the Error event to handle an exception that occurs in the body of the agent.
open System type Message = string let agent = MailboxProcessor<Message>.Start(fun inbox -> let rec loop n = async { let! message = inbox.Receive(10000); printfn "Message number %d. Message contents: %s" n message do! loop (n + 1) } loop 0) agent.Error.Add(fun exn -> match exn with | :? System.TimeoutException as exn -> printfn "The agent timed out." printfn "Press Enter to close the program." Console.ReadLine() |> ignore exit(1) | _ -> printfn "Unknown exception.") printfn "Mailbox Processor Test" printfn "Type some text and press Enter to submit a message." while true do Console.ReadLine() |> agent.Post
An example session follows.
Mailbox Processor Test Type some text and press Enter to submit a message. hello Message number 0. Message contents: hello testing Message number 1. Message contents: testing The agent timed out. Press Enter to close the program.
