Where is ISubject?

Question

I don't have ISubject, Subject class in my VS2012 with Net4.5. Did they became obselete? Should I use only IObservable and IObserver? If not how can I get them?

Answer 1

In Rx 1.x, ISubject is defined in the System.Reactive assembly, so you'll need to add a reference to that.

In Rx 2.x, ISubject is defined in the System.Reactive.Interfaces assembly (Rx-Interfaces NuGet package) and Subject<T> is defined in the System.Reactive.Linq assembly (Rx-Linq NuGet package). You can just add a reference to Rx-Linq as it has a dependency on Rx-Interfaces.