Groups the elements of a sequence according to a specified key selector function
that returns a sequence of keys
and compares the keys by using a specified comparer.
Syntax
public static IEnumerable<IGrouping<TKey, TSource>> GroupByMany<TSource, TKey>(this IEnumerable<TSource> source, Func<TSource, IEnumerable<TKey>> keySelector, IEqualityComparer<TKey> comparer)
Type Parameters
| Name |
Description |
| TSource |
The type of the source. |
| TKey |
The type of the key. |
Parameters
| Name |
Type |
Description |
| source |
IEnumerable<TSource> |
The source. |
| keySelector |
Func<TSource, IEnumerable<TKey>> |
The key selector. |
| comparer |
IEqualityComparer<TKey> |
The comparer. |
Return Value
| Type |
Description |
| IEnumerable<IGrouping<TKey, TSource>> |
A sequence of groups. |