Xamarin Forms using RX.md

Content

Type of Subjects

Replacing MessageCenter

Search Box search on TextChangedEvent with time control

Type of Subjects

Class	Each next subscribers recevie...
Subject	Only upcoming values
BehaviorSubject	one previous value and upcoming values
ReplaySubject	all previous value and upcoming values
AsyncSubject	latest value and stream will close upcoming values

Replacing MessageCenter

Case : Subsribe a change

Approach by MessageCenter

//Subscribe
    MessagingCenter.Instance.Subscribe<string>("ObjectChange", "ObjectChange", (str) =>
            {
                //
                Your action
            });

//Notify change
    MessagingCenter.Instance.Send("ObjectChange", "ObjectChange");

Approach by RX

//Import library
using System.Reactive.Linq;
using System;

//Create Observable item
    public class ObservableObjects
    {
        public static ISubject<string> CurrentAppLanguageObservable = new Subject<string>();
    }

//Subscribe 
    ObservableObjects.CurrentAppLanguageObservable.Subscribe(str=>{
        //action on change
    });
    
//Notify change
    ObservableObjects.CurrentAppLanguageObservable.OnNext("Str");

Search Box search on TextChangedEvent with time control

Case : Create a search box which will search after no text changed in 1 second

  <!-- Create SearchBar in XAML -->
  <SearchBar x:Name="SearchBox"/>

   Observable.FromEventPattern(SearchBox, "TextChanged")
                .Do(sender =>
                {
                    var searchbar = (sender as SearchBar);
                    //Action will be done on every text change here
                })
                //Wait for 1 second
                .Throttle(new TimeSpan(0, 0, 1))
                .Subscribe(sender =>
                {
                    var searchbar = (sender as SearchBar);
                    //Do your search logic which is heavy load here
                });