<PackageReference Include="System.Reactive" Version="6.0.0" />

IConnectableObservable<T>

public interface IConnectableObservable<T> : IObservable<T>
Represents an observable wrapper that can be connected and disconnected from its underlying observable sequence.
using System.Runtime.CompilerServices; namespace System.Reactive.Subjects { [System.Runtime.CompilerServices.NullableContext(1)] public interface IConnectableObservable<[System.Runtime.CompilerServices.Nullable(2)] out T> : IObservable<T> { IDisposable Connect(); } }