public static TSource Single <TSource>(this IReadOnlyList <TSource> source, Func <TSource, bool> predicate) { switch (source) { case TSource[] array: return(ArrayExtensions.Single <TSource>(array, predicate)); default: return(ReadOnlyList.Single <IReadOnlyList <TSource>, IEnumerator <TSource>, TSource>(source, predicate)); } }
public static TSource Single <TSource>(this IEnumerable <TSource> source, Func <TSource, bool> predicate) { switch (source) { case TSource[] array: return(ArrayExtensions.Single <TSource>(array, predicate)); default: return(SingleDowncasted <IEnumerable <TSource>, TSource> .Single(source)); } }