<PackageReference Include="System.Reactive" Version="4.3.2" />

ISchedulerPeriodic

public interface ISchedulerPeriodic
Scheduler with support for running periodic tasks. This type of scheduler can be used to run timers more efficiently instead of using recursive scheduling.
namespace System.Reactive.Concurrency { public interface ISchedulerPeriodic { IDisposable SchedulePeriodic<TState>(TState state, TimeSpan period, Func<TState, TState> action); } }