Question

I would like to repeatedly get a properties value and assign it to another property, but I don’t have a handle on Rx’s Observable creation quite yet. How do I create and subscribe to an observable that just constantly reads a property (maybe on a timer or with throttling)?

Answer 1

You can use the static Interval operator to emit a value repeatedly on a given time span and then use a Select opertor to transform it to the property value on the object you wish to poll.

var objectIWantToPoll = new MyObject(); 
var objectIWantToSetPropertyOn = new MyObject();


var polledValues =  Observable.Interval(TimeSpan.FromSeconds(1)) 
   .Select(_ => objectIWantToPoll.SomeProperty);

polledValues.Subscribe(propertyValue => 
   objectIWantToSetPropertyOn.SomeProperty = propertyValue));