Working with List<String> and Reactive extensions

Question

I have started researching Reactive extensions and I would like to know how to do the following (ill try and keep it simple):

1. Have a list of string (or any other type)

2. When an item is added to the said list, do something with it.

Answer 1

You can't do that with the existing List<String> class - it doesn't provide notifications, and there's nothing that Reactive Extensions can do about that.

You might want to look at ObservableCollection<T> though.

Answer 2

Get ReactiveUI, then you can use the ReactiveCollection class - then you can use the ItemsAdded Observable.

ReactiveCollection<int> someCollection;

someCollection.ItemsAdded
    .Where(x => x > 100)
    .Subscribe(x => Console.WriteLine("Whoa! A big item was added!"));