C#: How do you implement the observer pattern with IObservable?

1public class TemperatureSensor : IObservable<int>
2{
3    private readonly List<IObserver<int>> _observers = new();
4
5    public IDisposable Subscribe(IObserver<int> observer)
6    {
7        _observers.Add(observer);
8        return new Unsubscriber(_observers, observer);
9    }
10
11    public void Notify(int temp)
12    {
13        foreach (var obs in _observers)
14            obs.OnNext(temp);
15    }
16}

1public class TemperatureDisplay : IObserver<int>
2{
3    public void OnNext(int value) =>
4        Console.WriteLine($"Temperature: {value}");
5    public void OnError(Exception ex) { }
6    public void OnCompleted() { }
7}