<PackageReference Include="System.Reactive" Version="4.2.0-preview.566" />

Pattern<TSource1, TSource2, TSource3, TSource4, TSource5, TSource6, TSource7>

public class Pattern<TSource1, TSource2, TSource3, TSource4, TSource5, TSource6, TSource7> : Pattern
Represents a join pattern over seven observable sequences.
public Pattern<TSource1, TSource2, TSource3, TSource4, TSource5, TSource6, TSource7, TSource8> And<TSource8>(IObservable<TSource8> other)

Creates a pattern that matches when all eight observable sequences have an available element.

public Plan<TResult> Then<TResult>(Func<TSource1, TSource2, TSource3, TSource4, TSource5, TSource6, TSource7, TResult> selector)

Matches when all observable sequences have an available element and projects the elements by invoking the selector function.