namespace System.Reactive.Linq.ObservableImpl { internal sealed class MaxDecimalNullable : Producer<decimal?, MaxDecimalNullable._> { internal sealed class _ : IdentitySink<decimal?> { private decimal? _lastValue; public _(IObserver<decimal?> observer) : base(observer) { } public override void OnNext(decimal? value) { if (value.HasValue) { if (_lastValue.HasValue) { decimal? nullable = value; decimal? lastValue = _lastValue; if ((nullable.GetValueOrDefault() > lastValue.GetValueOrDefault()) & (nullable.HasValue & lastValue.HasValue)) _lastValue = value; } else _lastValue = value; } } public override void OnCompleted() { ForwardOnNext(_lastValue); ForwardOnCompleted(); } } private readonly IObservable<decimal?> _source; public MaxDecimalNullable(IObservable<decimal?> source) { _source = source; } protected override _ CreateSink(IObserver<decimal?> observer) { return new _(observer); } protected override void Run(_ sink) { sink.Run(_source); } } }