fsharp events

The .Publish property returns an IEvent and we can use it to add handlers.

The .Trigger method allows to trigger events with parameters.

  let e = new Event<string>()

  [<EntryPoint>]
  let main _ =
      e.Publish.Add(fun s -> s.ToUpper() |> printf "%s")
      e.Trigger("helloworld")
      0

The IEvent<T> type provides the .Add method to events, which is just a wrapper around the IObservable<T>'s Subscribe method: it builds an IObserver<T> using the provided lambda.

The Event module contains functions that can is more functional friendly:

  Event.add (fun s -> printfn "%s!" s) e.Publish

The Event<T> is a class that implements Publish and Trigger methods.