C# event debounce

Question

I\'m listening to a hardware event message, but I need to debounce it to avoid too many queries.

This is an hardware event that sends the machine status and I have t

Answer 1

Panagiotis's answer is certainly correct, however I wanted to give a simpler example, as it took me a while to sort through how to get it working. My scenario is that a user types in a search box, and as the user types we want to make api calls to return search suggestions, so we want to debounce the api calls so they don't make one every time they type a character.

I'm using Xamarin.Android, however this should apply to any C# scenario...

private Subject typingSubject = new Subject ();
private IDisposable typingEventSequence;

private void Init () {
            var searchText = layoutView.FindViewById (Resource.Id.search_text);
            searchText.TextChanged += SearchTextChanged;
            typingEventSequence = typingSubject.Throttle (TimeSpan.FromSeconds (1))
                .Subscribe (query => suggestionsAdapter.Get (query));
}

private void SearchTextChanged (object sender, TextChangedEventArgs e) {
            var searchText = layoutView.FindViewById (Resource.Id.search_text);
            typingSubject.OnNext (searchText.Text.Trim ());
        }

public override void OnDestroy () {
            if (typingEventSequence != null)
                typingEventSequence.Dispose ();
            base.OnDestroy ();
        }

When you first initialize the screen / class, you create your event to listen to the user typing (SearchTextChanged), and then also set up a throttling subscription, which is tied to the "typingSubject".

Next, in your SearchTextChanged event, you can call typingSubject.OnNext and pass in the search box's text. After the debounce period (1 second), it will call the subscribed event (suggestionsAdapter.Get in our case.)

Lastly, when the screen is closed, make sure to dispose of the subscription!