Reactive Extensions Subscribe calling await

Question

I want to perform an async call based for each event raised by a Reactive Extensions Observable. I\'m also trying to keep everything synchronized as I want the async ca

Answer 1

How about:

settingsChangedInMemory
    .SelectMany(async _ => await SaveSettings(Extract()))
    .Subscribe(x => Apply(x));

Never put an async in a Subscribe, you always want to put it in a SelectMany instead.

Answer 2

You can use the new ForEachAsync method released in Reactive Extensions (Rx) 2.0 like so:

await observable
    .ForEachAsync(async x =>
    {
        Console.WriteLine(x);
        await Task.Delay(1000);
    });

ForEachAsync returns a Task<T> which completes when the observable completes. More information in my blog post here or this blog post by the reactive extensions team.