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r3-reactive-extensions

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Build reactive/event-driven C# with R3 (Cysharp's modern reimplementation of Reactive Extensions). Covers the Observable<T>/Observer<T> model, the OnErrorResume error contract, async dispatch with AwaitOperation, Task/IAsyncEnumerable integration, TimeProvider/FrameProvider scheduling, the concurrency contract, and how R3 differs from System.Reactive (Rx.NET).

When to use

• Composing **events** over time — UI input, sensor/feed updates, websocket messages, domain events
• You need operators like debounce, throttle, merge, combine-latest, distinct-until-changed
• Building **MVVM** state with `ReactiveProperty` / `BindableReactiveProperty`
• Bridging push-based streams with `Task` / `async` and `IAsyncEnumerable`
• Migrating from `System.Reactive`, UniRx, or `IObservable<T>` code
• You hit Rx pain points: subscriptions dying on exceptions, scheduler overhead, or leak hunting

When not to use

• Request/response I/O
• Bounded producer/consumer with backpressure
• Server-side stream processing with batching/backpressure

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