Events

Roslyn source generators turn classic CLR events (and optional UI routed events) into reactive streams.

Packages

Package	Stream type
Observables.Events.R3	R3 `Observable<T>`
Observables.Events.Reactive	`IObservable<T>`

Add the matching runtime: R3 or System.Reactive.

csharp

using Observables.Events.R3;
using R3;

public class ClickSource
{
    public event Action? Click;
}

var stream = new ClickSource().Events().Click;

Events() — Action → Observable<Unit>; Action<T> / EventHandler<T> → Observable<T> (or tuple for (object, T) handlers).
EventHandlers() — uses EventObservable.EventHandler for EventHandler / (object, T) shapes.

Import buildTransitive/observables.events.props from the package (automatic with the meta-package). Enable generation:

xml

<PropertyGroup>
  <ObservableRoutedEvents>true</ObservableRoutedEvents>
</PropertyGroup>

WPF also requires <UseWPF>true</UseWPF>.

API surface (R3 namespace Observables.Events.R3):

RoutedEvents() / RoutedEventHandlers() on controls such as Button
AttachedRoutedEvent / AttachedRoutedEventHandler on a parent (Panel, etc.)

See Observables.Samples.Events.Routed for an Avalonia desktop example (local run; not executed in Samples CI).