public TResult TryGetLast(out bool found) { bool sourceFound; TSource input = _source.TryGetLast(out sourceFound); found = sourceFound; return(sourceFound ? _selector(input) : default(TResult)); }
public static TSource Last <TSource>(this IEnumerable <TSource> source) { if (source == null) { throw Error.ArgumentNull(nameof(source)); } IPartition <TSource> partition = source as IPartition <TSource>; if (partition != null) { bool found; TSource last = partition.TryGetLast(out found); if (found) { return(last); } } else { IList <TSource> list = source as IList <TSource>; if (list != null) { int count = list.Count; if (count > 0) { return(list[count - 1]); } } else { using (IEnumerator <TSource> e = source.GetEnumerator()) { if (e.MoveNext()) { TSource result; do { result = e.Current; }while (e.MoveNext()); return(result); } } } } throw Error.NoElements(); }
internal static TSource TryGetLast <TSource>(this IEnumerable <TSource> source, out bool found) { if (source == null) { throw Error.ArgumentNull(nameof(source)); } IPartition <TSource> partition = source as IPartition <TSource>; if (partition != null) { return(partition.TryGetLast(out found)); } IList <TSource> list = source as IList <TSource>; if (list != null) { int count = list.Count; if (count > 0) { found = true; return(list[count - 1]); } } else { using (IEnumerator <TSource> e = source.GetEnumerator()) { if (e.MoveNext()) { TSource result; do { result = e.Current; }while (e.MoveNext()); found = true; return(result); } } } found = false; return(default(TSource)); }