MoreEnumerable.FullGroupJoin<TFirst, TSecond, TKey, TResult>(IEnumerable<TFirst>, IEnumerable<TSecond>, Func<TFirst, TKey>, Func<TSecond, TKey>, Func<TKey, IEnumerable<TFirst>, IEnumerable<TSecond>, TResult>) Method

Performs a full group-join between two sequences.

Definition

Namespace: MoreLinq
Assembly: MoreLinq (in MoreLinq.dll) Version: 3.4.0+b99a6a8cc504caf2d48372fe54a2f8116c59cd0c

C#
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
)

VB
<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)

C++
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
)

F#
[<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> 

Parameters

first IEnumerable<TFirst>: First sequence
second IEnumerable<TSecond>: Second sequence
firstKeySelector Func<TFirst, TKey>: The mapping from first sequence to key
secondKeySelector Func<TSecond, TKey>: The mapping from second sequence to key
resultSelector Func<TKey, IEnumerable<TFirst>, IEnumerable<TSecond>, TResult>: Function to apply to each pair of elements plus the key

Type Parameters

TFirst: The type of the elements in the first input sequence
TSecond: The type of the elements in the second input sequence
TKey: The type of the key to use to join
TResult: The type of the elements of the resulting sequence

Return Value

IEnumerable<TResult>
A sequence of elements joined from first and second.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IEnumerable<TFirst>. When you use instance method syntax to call this method, omit the first parameter. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).

Remarks

This operator uses deferred execution and streams the results. The results are yielded in the order of the elements found in the first sequence followed by those found only in the second. In addition, the callback responsible for projecting the results is supplied with sequences which preserve their source order.