Working with List 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):

Have a list of string (or any other type)
When an item is added to the said list, do something with it.

score 9 · Accepted Answer · answered Jul 09 '11 at 17:42

9

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.

answered Jul 09 '11 at 17:42

Jon Skeet

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Thanks for pointing me in the right direction :) much appreciated – Stuart Blackler Jul 09 '11 at 18:18

score 6 · Answer 2 · answered Jul 09 '11 at 23:33

6

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!"));

answered Jul 09 '11 at 23:33

Ana Betts

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Didn't know about ReactiveUI. Thanks for the heads up :) +1 – Stuart Blackler Jul 19 '11 at 08:15

score 1 · Answer 3 · answered Jul 09 '11 at 23:06

1

If you have a List<T>, or really any collection that implements IEnumerable then Rx isn't the answer. But if you have a sequence of items, some of which don't exist yet, then by all means, Rx is a good solution.

answered Jul 09 '11 at 23:06

Scott Weinstein

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Working with List and Reactive extensions

3 Answers3