XEnumerableLeftOuterJoinTLeft, TRight, TKey, TResult Method

public static IEnumerable<TResult> LeftOuterJoin<TLeft, TRight, TKey, TResult>(
	this IEnumerable<TLeft> left,
	IEnumerable<TRight> right,
	Func<TLeft, TKey> leftKeySelector,
	Func<TRight, TKey> rightKeySelector,
	Func<TLeft, TRight, TResult> resultSelector,
	TRight defaultRight = null,
	IEqualityComparer<TKey>? keyComparer = null
)

<ExtensionAttribute>
Public Shared Function LeftOuterJoin(Of TLeft, TRight, TKey, TResult) ( 
	left As IEnumerable(Of TLeft),
	right As IEnumerable(Of TRight),
	leftKeySelector As Func(Of TLeft, TKey),
	rightKeySelector As Func(Of TRight, TKey),
	resultSelector As Func(Of TLeft, TRight, TResult),
	Optional defaultRight As TRight = Nothing,
	Optional keyComparer As IEqualityComparer(Of TKey) = Nothing
) As IEnumerable(Of TResult)

[<ExtensionAttribute>]
static member LeftOuterJoin : 
        left : IEnumerable<'TLeft> * 
        right : IEnumerable<'TRight> * 
        leftKeySelector : Func<'TLeft, 'TKey> * 
        rightKeySelector : Func<'TRight, 'TKey> * 
        resultSelector : Func<'TLeft, 'TRight, 'TResult> * 
        ?defaultRight : 'TRight * 
        ?keyComparer : IEqualityComparer<'TKey> 
(* Defaults:
        let _defaultRight = defaultArg defaultRight null
        let _keyComparer = defaultArg keyComparer null
*)
-> IEnumerable<'TResult>