What is the Action returned by the subscribe parameter of IObservable.Create actually for?

Posted by James Hay on Stack Overflow See other posts from Stack Overflow or by James Hay
Published on 2010-12-22T18:34:59Z Indexed on 2010/12/22 18:54 UTC
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Filed under:

c#

|

system.reactive

|

rx

|

reactive-extensions

The method definition of IObservable.Create is:

public static IObservable<TSource> Create<TSource>(
    Func<IObserver<TSource>, Action> subscribe
)

I get that the function is called once the observable is subscribed to, where by I can then call OnNext, OnError and OnComplete on the observer. But why do I need to return an Action from the subscibe parameter and when will it actually be called?

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