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Showing content from https://morelinq.github.io/3.0/ref/api/html/M_MoreLinq_MoreEnumerable_LeftJoin__3.htm below:

MoreEnumerableLeftJoinTSource, TKey, TResult Method (IEnumerableTSource, IEnumerableTSource, FuncTSource, TKey, FuncTSource, TResult, FuncTSource, TSource, TResult)

Performs a left outer join on two homogeneous sequences. Additional arguments specify key selection functions and result projection functions.

MoreLinq (in MoreLinq.dll) Version: 3.0.0

public static IEnumerable<TResult> LeftJoin<TSource, TKey, TResult>(
	this IEnumerable<TSource> first,
	IEnumerable<TSource> second,
	Func<TSource, TKey> keySelector,
	Func<TSource, TResult> firstSelector,
	Func<TSource, TSource, TResult> bothSelector
)

<ExtensionAttribute>
Public Shared Function LeftJoin(Of TSource, TKey, TResult) ( 
	first As IEnumerable(Of TSource),
	second As IEnumerable(Of TSource),
	keySelector As Func(Of TSource, TKey),
	firstSelector As Func(Of TSource, TResult),
	bothSelector As Func(Of TSource, TSource, TResult)
) As IEnumerable(Of TResult)

public:
[ExtensionAttribute]
generic<typename TSource, typename TKey, typename TResult>
static IEnumerable<TResult>^ LeftJoin(
	IEnumerable<TSource>^ first, 
	IEnumerable<TSource>^ second, 
	Func<TSource, TKey>^ keySelector, 
	Func<TSource, TResult>^ firstSelector, 
	Func<TSource, TSource, TResult>^ bothSelector
)

[<ExtensionAttribute>]
static member LeftJoin : 
        first : IEnumerable<'TSource> * 
        second : IEnumerable<'TSource> * 
        keySelector : Func<'TSource, 'TKey> * 
        firstSelector : Func<'TSource, 'TResult> * 
        bothSelector : Func<'TSource, 'TSource, 'TResult> -> IEnumerable<'TResult> 

first

Type: System.Collections.GenericIEnumerableTSource
The first sequence of the join operation.

second

Type: System.Collections.GenericIEnumerableTSource
The second sequence of the join operation.

keySelector

Type: SystemFuncTSource, TKey
Function that projects the key given an element of one of the sequences to join.

firstSelector

Type: SystemFuncTSource, TResult
Function that projects the result given just an element from first where there is no corresponding element in second.

bothSelector

Type: SystemFuncTSource, TSource, TResult
Function that projects the result given an element from first and an element from second that match on a common key.

TSource

The type of elements in the source sequence.

TKey

The type of the key returned by the key selector function.

TResult

The type of the result elements.

Type:

A sequence containing results projected from a left outer join of the two input sequences.

In Visual Basic and C#, you can call this method as an instance method on any object of type

. When you use instance method syntax to call this method, omit the first parameter. For more information, see

or

.

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