<PackageReference Include="System.Reactive" Version="4.1.4" />

IQbservable

public interface IQbservable
Provides functionality to evaluate queries against a specific data source wherein the type of the data is not specified.
Type ElementType { get; }

Gets the type of the element(s) that are returned when the expression tree associated with this instance of IQbservable is executed.

Expression Expression { get; }

Gets the expression tree that is associated with the instance of IQbservable.

IQbservableProvider Provider { get; }

Gets the query provider that is associated with this data source.