public interface IObservable<out T>
{
IDisposable Subscribe(IObserver<T> observer);
}
public interface IObserver<in T>
{
void OnCompleted();// Notifies the observer that the source has finished sending messages.
void OnError(Exception error); // Notifies the observer about any exception or error.
void OnNext(T value); // Pushes the next data value from the source to the observer.
}
IObservable<int> source = Observable.Range(1, 5); //creates an observable sequence of 5 integers, starting from 1
IDisposable subscription = source.Subscribe(
x => Console.WriteLine("OnNext: {0}", x), //prints out the value being pushed
ex => Console.WriteLine("OnError: {0}", ex.Message),
() => Console.WriteLine("OnCompleted"));
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