F#: What is the relationship of an Add method and an IObserver<>

Question

I have the following code working code that I derived from a Pluralsight video from Mark Seeman. I do not understand how the last line works.

let sharpObjectCollection = ConcurrentBag<Envelope<SharpObject>>()
let sharpObjectSubject = new Subjects.Subject<Envelope<SharpObject>>()
sharpObjectSubject.Subscribe sharpObjectCollection.Add |> ignore

Looking through the documentation for Subscribe, I see that it takes an IObserver as an argument, but I am passing it the ConcurrentBag.Add method.

What is going on here? Is this a feature of F#? Can I do this in c# too?

score 5 · Accepted Answer · answered Oct 10 '15 at 16:28

5

It looks like it is calling this extension method which defines an overload of Subscribe which takes an Action<T> onNext handler. You can also do this in C#:

var bag = new ConcurrentBag<Envelope<SharpObject>>();
var subject = new Subject<Envelope<SharpObject>>();
subject.Subscribe(bag.Add);

answered Oct 10 '15 at 16:28

Lee

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That is the answer. How did you find that? Weird side note, you cannot accept answer in the first three minutes of asking. – Phillip Scott Givens Oct 10 '15 at 16:32

F#: What is the relationship of an Add method and an IObserver<>

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