void ReactiveSearch()
{
//1. Create Observable from TextChanged event of the SearchBox
//2. Select the text that was entered
//3. Keep only strings with >3 characters
//4. Take only if the time passed > 0.5 sec
//5. Take only if it's not the same string again
//6. Asynchronically call the Search service
//7. Discard results if another search was requested
//8. Show the results inside the SearchResult listbox
var client = new SearchServiceClient();
_subscription =
Observable.FromEventPattern(SearchBox, nameof(SearchBox.TextChanged))
.Select(_ => SearchBox.Text)
.Where(txt => txt.Length >= 3)
.Throttle(TimeSpan.FromSeconds(0.5))
.DistinctUntilChanged()
.Select(txt => _client.SearchAsync(txt))
.Switch()
.ObserveOnDispatcher()
.Subscribe(
results => SearchResults.ItemsSource = results,
err => { Debug.WriteLine(err); },
() => { /* OnCompleted */ });
#region clearing results for short search terms
Observable.FromEventPattern(SearchBox, "TextChanged")
.Select(_ => SearchBox.Text)
.Where(txt => txt.Length < 3)
.ObserveOnDispatcher()
.Subscribe(
results => SearchResults.ItemsSource = Enumerable.Empty<string>(),
err => { Debug.WriteLine(err); },
() => { /* OnCompleted */ });
#endregion
}
