IQbservable
Provides functionality to evaluate queries against a specific data source wherein the type of the data is not specified.
            
                using System.Linq.Expressions;
using System.Runtime.CompilerServices;
namespace System.Reactive.Linq
{
    [System.Runtime.CompilerServices.NullableContext(1)]
    public interface IQbservable
    {
        Type ElementType { get; }
        Expression Expression { get; }
        IQbservableProvider Provider { get; }
    }
}