The core of Realm tracks writes across different threads and processes and that's how we know to update the result objects without rebuilding the query or rebin

The core of Realm tracks writes across different threads and processes and that's how we know to update the result objects without rebuilding the query or rebinding the model objects. There is a PR to actually expose this as a high-level notifications API and we'll roll it out in our next Realm Xamarin release: https://github.com/realm/realm-dotnet/pull/502/commits/f4169276e3c197a875f2aca259c24e80700344ab https://github.com/realm/realm-dotnet/pull/502/commits/f4169.... Using that it will be possible to implement INotifyCollectionChanged and IObservable directly on top of Realm.