MongoEnumerable.FirstN<TSource, TKey, TResult> Method (IEnumerable<TSource>, Func<TSource, TResult>, TKey, Func<TKey, Int32>)

public static IEnumerable<TResult> FirstN<TSource, TKey, TResult>(
	this IEnumerable<TSource> source,
	Func<TSource, TResult> selector,
	TKey key,
	Func<TKey, int> n
)

<ExtensionAttribute>
Public Shared Function FirstN(Of TSource, TKey, TResult) ( 
	source As IEnumerable(Of TSource),
	selector As Func(Of TSource, TResult),
	key As TKey,
	n As Func(Of TKey, Integer)
) As IEnumerable(Of TResult)

[<ExtensionAttribute>]
static member FirstN : 
        source : IEnumerable<'TSource> * 
        selector : Func<'TSource, 'TResult> * 
        key : 'TKey * 
        n : Func<'TKey, int> -> IEnumerable<'TResult>