MinimalSchedule for IScheduler from Rx

SchedulerExtensions.cs

public static class SchedulerExtensions
    {
        /// <summary>
        /// Schedules an action to be executed.
        /// </summary>
        /// <param name="scheduler">Scheduler to execute the action on.</param>
        /// <param name="action">Action to execute.</param>
        /// <returns>The disposable object used to cancel the scheduled action (best effort).</returns>
        /// <exception cref="ArgumentNullException"><paramref name="scheduler"/> or <paramref name="action"/> is <c>null</c>.</exception>
        public static IDisposable MinimalSchedule(this IScheduler scheduler, Action action)
        {
            if (scheduler == null)
                throw new ArgumentNullException(nameof(scheduler));
            if (action == null)
                throw new ArgumentNullException(nameof(action));

            return scheduler.Schedule(Unit.Default, (_, __) =>
            {
                action();
                return Disposable.Empty;
            });
        }

        /// <summary>
        /// Schedules a func returning a non-generic task to be executed. Can be used for async lambdas.
        /// </summary>
        /// <param name="scheduler">Scheduler to execute the func on.</param>
        /// <param name="func">Func returning a non-generic task to be executed asynchronously.</param>
        /// <returns>The disposable object used to cancel the scheduled action (best effort).</returns>
        /// <exception cref="ArgumentNullException"><paramref name="scheduler"/> or <paramref name="func"/> is <c>null</c>.</exception>
        public static IDisposable MinimalScheduleAsync(this IScheduler scheduler, Func<Task> func)
        {
            if (scheduler == null)
                throw new ArgumentNullException(nameof(scheduler));
            if (func == null)
                throw new ArgumentNullException(nameof(func));

            return scheduler.ScheduleAsync(Unit.Default, async (_, __, ___) =>
            {
                await func();
                return Disposable.Empty;
            });
        }
    }