MoreEnumerableFullGroupJoinTFirst, TSecond, TKey, TResult(IEnumerableTFirst, IEnumerableTSecond, FuncTFirst, TKey, FuncTSecond, TKey, FuncTKey, IEnumerableTFirst, IEnumerableTSecond, TResult, IEqualityComparerTKey) Method

Performs a full group-join between two sequences.

Definition

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

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,
	IEqualityComparer<TKey>? comparer
)

<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),
	comparer As IEqualityComparer(Of TKey)
) 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, 
	IEqualityComparer<TKey>^ comparer
)

[<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> * 
        comparer : IEqualityComparer<'TKey> -> IEnumerable<'TResult>

Parameters

first IEnumerableTFirst: First sequence
second IEnumerableTSecond: Second sequence
firstKeySelector FuncTFirst, TKey: The mapping from first sequence to key
secondKeySelector FuncTSecond, TKey: The mapping from second sequence to key
resultSelector FuncTKey, IEnumerableTFirst, IEnumerableTSecond, TResult: Function to apply to each pair of elements plus the key
comparer IEqualityComparerTKey: The equality comparer to use to determine whether or not keys are equal. If null, the default equality comparer for TKey is used.

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

IEnumerableTResult
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 IEnumerableTFirst. 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.