Question

How can I do this?

I have a code that does:

new int[]{1,2,3}.ToObservable().Subscribe(myObserver);

The problem is this first call is a cold observable so that on another call like this:

new int[]{4,5,6}.ToObservable().Subscribe(myObserver);

myObserver does not trigger onNext at all. Apparently because the first call publishes 1,2,3, END. I don’t want the observable to call “END”, because I want to continue subscribing later on. Is there a function that easily does this for me?

Answer 1

You would need to do something like this:

new int[] { 1, 2, 3, }
    .ToObservable()
    .Concat(Observable.Never<int>())
    .Subscribe(myObserver); 

new int[] { 4, 5, 6, }
    .ToObservable()
    .Concat(Observable.Never<int>())
    .Subscribe(myObserver);

The key is to do a .Concat(Observable.Never<int>()) on the observable to prevent it ever ending.