<PackageReference Include="System.Reactive" Version="6.0.2" />

System.Reactive.Joins.QueryablePattern<TSource1, TSource2>

public class QueryablePattern<TSource1, TSource2> : QueryablePattern
Represents a join pattern over two observable sequences.
namespace System.Reactive.Joins { public class QueryablePattern<TSource1, TSource2> : QueryablePattern { public QueryablePattern<TSource1, TSource2, TSource3> And<TSource3>(IObservable<TSource3> other); public QueryablePlan<TResult> Then<TResult>(Expression<Func<TSource1, TSource2, TResult>> selector); } }