using System.Collections.Generic; namespace System.Reactive.Linq.ObservableImpl { internal sealed class For<TSource, TResult> : Producer<TResult, For<TSource, TResult>._>, IConcatenatable<TResult> { internal sealed class _ : ConcatSink<TResult> { public _(IObserver<TResult> observer) : base(observer) { } } private readonly IEnumerable<TSource> _source; private readonly Func<TSource, IObservable<TResult>> _resultSelector; public For(IEnumerable<TSource> source, Func<TSource, IObservable<TResult>> resultSelector) { _source = source; _resultSelector = resultSelector; } protected override _ CreateSink(IObserver<TResult> observer) { return new _(observer); } protected override void Run(_ sink) { sink.Run(GetSources()); } public IEnumerable<IObservable<TResult>> GetSources() { foreach (TSource item in this._source) { yield return this._resultSelector(item); } } } }