public static IEnumerable<TResult> FullGroupJoin<TFirst, TSecond, TKey, TResult>(
	this IEnumerable<TFirst> first,
	IEnumerable<TSecond> second,
	Func<TFirst, TKey> firstKeySelector,
	Func<TSecond, TKey> secondKeySelector,
	Func<TKey, IEnumerable<TFirst>, IEnumerable<TSecond>, TResult> resultSelector
)

<ExtensionAttribute>
Public Shared Function FullGroupJoin(Of TFirst, TSecond, TKey, TResult) ( 
	first As IEnumerable(Of TFirst),
	second As IEnumerable(Of TSecond),
	firstKeySelector As Func(Of TFirst, TKey),
	secondKeySelector As Func(Of TSecond, TKey),
	resultSelector As Func(Of TKey, IEnumerable(Of TFirst), IEnumerable(Of TSecond), TResult)
) As IEnumerable(Of TResult)

public:
[ExtensionAttribute]
generic<typename TFirst, typename TSecond, typename TKey, typename TResult>
static IEnumerable<TResult>^ FullGroupJoin(
	IEnumerable<TFirst>^ first, 
	IEnumerable<TSecond>^ second, 
	Func<TFirst, TKey>^ firstKeySelector, 
	Func<TSecond, TKey>^ secondKeySelector, 
	Func<TKey, IEnumerable<TFirst>^, IEnumerable<TSecond>^, TResult>^ resultSelector
)

[<ExtensionAttribute>]
static member FullGroupJoin : 
        first : IEnumerable<'TFirst> * 
        second : IEnumerable<'TSecond> * 
        firstKeySelector : Func<'TFirst, 'TKey> * 
        secondKeySelector : Func<'TSecond, 'TKey> * 
        resultSelector : Func<'TKey, IEnumerable<'TFirst>, IEnumerable<'TSecond>, 'TResult> -> IEnumerable<'TResult>