R3

Third Generation of Reactive Extensions.

• LINQ is not for EveryThing

public abstract class Observable<T>
{
    public IDisposable Subscribe(Observer<T> observer);
}

public abstract class Observer<T> : IDisposable
{
    public void OnNext(T value);
    public void OnErrorResume(Exception error);
    public void OnCompleted(Result result);
}

Unity

lower supported version: Unity 2021.3