public ViewModelReactive2()
{
#region scenario 1
//var textChangedSequence = Observable.FromEventPattern<PropertyChangedEventArgs>(this,
// nameof(PropertyChanged));
//var throttledTextChangedSequence = textChangedSequence
// .Where(a => a.EventArgs.PropertyName == nameof(EnteredSearchQuery))
// .Select(a => EnteredSearchQuery)
// .DistinctUntilChanged()
// .Throttle(TimeSpan.FromSeconds(.5));
#endregion
#region scenario 2
var throttledTextChangedSequence = this.GetPropertyAsObservable(() => EnteredSearchQuery)
.DistinctUntilChanged()
.Throttle(TimeSpan.FromSeconds(.5));
#endregion
var result = from qry in throttledTextChangedSequence
from images in SearchDataService.Search(qry).TakeUntil(throttledTextChangedSequence)
select images?.Select(a => a.thumb_url);
throttledTextChangedSequence.ObserveOn(
SynchronizationContext.Current).Subscribe(e => UpdateList(null));
result.ObserveOn(
SynchronizationContext.Current).Subscribe(UpdateList);
}
private void DoReactive()
{
var textChangedSequence =
Observable.FromEventPattern <TextChangedEventArgs>(SearchBox,
nameof(SearchBox.TextChanged));
var throttledTextChangedSequence =
textChangedSequence.Select(x => ((TextBox)x.Sender).Text)
.DistinctUntilChanged()
.Throttle(TimeSpan.FromSeconds(.5));
var result = (from qry in throttledTextChangedSequence
from images in SearchDataService.Search(qry)
.TakeUntil(throttledTextChangedSequence)
select images);
result.ObserveOn(SynchronizationContext.Current).Subscribe(
(e) => ViewModel.Results = e?.Select(a => a.thumb_url).ToList());
}