public static IEnumerable <TResult> GroupJoin <TOuter, TInner, TKey, TResult>(this IEnumerable <TOuter> outer, IEnumerable <TInner> inner, Func <TOuter, TKey> outerKeySelector, Func <TInner, TKey> innerKeySelector, Func <TOuter, IEnumerable <TInner>, TResult> resultSelector, IEqualityComparer <TKey> comparer)
{
LinqCheck.JoinSelectors(outer, inner, outerKeySelector, innerKeySelector, resultSelector);
if (comparer == null)
{
comparer = EqualityComparer <TKey> .Default;
}
return(CreateGroupJoinIterator(outer, inner, outerKeySelector, innerKeySelector, resultSelector, comparer));
}
public static IOrderedEnumerable <TSource> ThenByDescending <TSource, TKey>(this IOrderedEnumerable <TSource> source, Func <TSource, TKey> keySelector, IComparer <TKey> comparer)
{
LinqCheck.SourceAndKeySelector(source, keySelector);
var oe = source as OrderedEnumerable <TSource>;
if (oe != null)
{
return(oe.CreateOrderedEnumerable(keySelector, comparer, true));
}
return(source.CreateOrderedEnumerable(keySelector, comparer, true));
}
public static IEnumerable <TResult> GroupBy <TSource, TKey, TElement, TResult>(this IEnumerable <TSource> source, Func <TSource, TKey> keySelector, Func <TSource, TElement> elementSelector, Func <TKey, IEnumerable <TElement>, TResult> resultSelector, IEqualityComparer <TKey> comparer)
{
LinqCheck.GroupBySelectors(source, keySelector, elementSelector, resultSelector);
return(CreateGroupByIterator(source, keySelector, elementSelector, resultSelector, comparer));
}
public static IOrderedEnumerable <TSource> OrderByDescending <TSource, TKey>(this IEnumerable <TSource> source, Func <TSource, TKey> keySelector, IComparer <TKey> comparer)
{
LinqCheck.SourceAndKeySelector(source, keySelector);
return(new OrderedSequence <TSource, TKey>(source, keySelector, comparer, SortDirection.Descending));
}
public static IEnumerable <IGrouping <TKey, TElement> > GroupBy <TSource, TKey, TElement>(this IEnumerable <TSource> source, Func <TSource, TKey> keySelector, Func <TSource, TElement> elementSelector, IEqualityComparer <TKey> comparer)
{
LinqCheck.SourceAndKeyElementSelectors(source, keySelector, elementSelector);
return(CreateGroupByIterator(source, keySelector, elementSelector, comparer));
}