<PackageReference Include="System.Reactive" Version="4.1.1" />

IQbservableProvider

public interface IQbservableProvider
Defines methods to create and execute queries that are described by an IQbservable object.
using System.Linq.Expressions; namespace System.Reactive.Linq { public interface IQbservableProvider { IQbservable<TResult> CreateQuery<TResult>(Expression expression); } }