namespace System.Reactive.Linq.ObservableImpl { internal sealed class Cast<TSource, TResult> : Producer<TResult, Cast<TSource, TResult>._> { internal sealed class _ : Sink<TSource, TResult> { public _(IObserver<TResult> observer) : base(observer) { } public override void OnNext(TSource value) { TResult val = default(TResult); try { val = (TResult)(object)value; } catch (Exception error) { ForwardOnError(error); return; } ForwardOnNext(val); } } private readonly IObservable<TSource> _source; public Cast(IObservable<TSource> source) { _source = source; } protected override _ CreateSink(IObserver<TResult> observer) { return new _(observer); } protected override void Run(_ sink) { sink.Run(_source); } } }