private static ChainStatus Pipeline <TKey, TElement, TResult>(Grouping <TKey, TElement> lastGrouping, Func <TKey, IEnumerable <TElement>, TResult> resultSelector, Chain <TResult> chain)
{
var state = ChainStatus.Flow;
Grouping <TKey, TElement> g = lastGrouping;
if (g != null)
{
do
{
g = g._next;
state = chain.ProcessNext(resultSelector(g.Key, g.GetEfficientList(true)));
if (state.IsStopped())
{
break;
}
}while (g != lastGrouping);
}
return(state);
}
