public static TSource MaxBy<TSource, TKey>(
	this IEnumerable<TSource> source,
	Func<TSource, TKey> selector,
	IComparer<TKey> comparer
)

<ExtensionAttribute> _
Public Shared Function MaxBy(Of TSource, TKey) ( _
	source As IEnumerable(Of TSource), _
	selector As Func(Of TSource, TKey), _
	comparer As IComparer(Of TKey) _
) As TSource

public:
[ExtensionAttribute]
generic<typename TSource, typename TKey>
static TSource MaxBy(
	IEnumerable<TSource>^ source, 
	Func<TSource, TKey>^ selector, 
	IComparer<TKey>^ comparer
)