public static IOrderedEnumerable <T> ThenByPosition <T, TKey>(this IOrderedEnumerable <T> source,
Func <T, TKey> keySelector,
IEnumerable <TKey> orderedKeys)
{
PositionalComparer <TKey> comparer = new PositionalComparer <TKey>(orderedKeys.EmptyIfNull());
return(source.ThenBy(keySelector, comparer));
}
public static IOrderedEnumerable <T> OrderByPosition <T, TKey>(this IEnumerable <T> source,
Func <T, TKey> keySelector,
IEnumerable <TKey> orderedKeys,
IComparer <TKey> alternateComparer)
{
PositionalComparer <TKey> comparer =
new PositionalComparer <TKey>(orderedKeys.EmptyIfNull(), alternateComparer);
return(source.OrderBy(keySelector, comparer));
}
