public static IEnumerable <IGrouping <TKey, TSource> > GroupProgressiveBy <TSource, TKey>(this IEnumerable <TSource> source, Func <TSource, TKey> keySelector, IEqualityComparer <TKey> comparer)
{
if (source == null)
{
throw new ArgumentNullException(nameof(source));
}
if (keySelector == null)
{
throw new ArgumentNullException(nameof(keySelector));
}
return(GroupBuilder <TKey, TSource, TSource> .CreateGroups(source, comparer, keySelector, FuncHelper.GetIdentityFunc <TSource>()));
}
public override IList <IEnumerator <T> > GetPartitions(int partitionCount)
{
var index = -1;
var groups = GroupBuilder <int, T, T> .CreateGroups
(
_source,
EqualityComparer <int> .Default,
arg => Interlocked.Increment(ref index) % partitionCount,
obj => obj
);
return(Extensions.WrapAsIList(groups.ConvertProgressive(g => g.GetEnumerator())));
}
public static IEnumerable <IGrouping <TKey, TElement> > GroupProgressiveBy <TSource, TKey, TElement>(this IEnumerable <TSource> source, Func <TSource, TKey> keySelector, Func <TSource, TElement> resultSelector, IEqualityComparer <TKey>?comparer)
{
if (source == null)
{
throw new ArgumentNullException(nameof(source));
}
if (keySelector == null)
{
throw new ArgumentNullException(nameof(keySelector));
}
if (resultSelector == null)
{
throw new ArgumentNullException(nameof(resultSelector));
}
return(GroupBuilder <TKey, TSource, TElement> .CreateGroups(source, comparer ?? EqualityComparer <TKey> .Default, keySelector, resultSelector));
}