GroupJoin<TOuter,TInner,TKey,TResult> Method (IndexedQueryExtensions)

Correlates the elements of two collections based on equality of keys and groups the results.

Syntax

Visual Basic
C#

'Declaration
 
Public Shared Function GroupJoin
    (Of TOuter,TInner,TKey,TResult)( _
   ByVal outer As IIndexedSource(Of TOuter), _
   ByVal inner As System.Collections.Generic.IEnumerable(Of TInner), _
   ByVal outerKeySelector As System.Linq.Expressions.Expression(Of Func(Of TOuter,TKey)), _
   ByVal innerKeySelector As System.Linq.Expressions.Expression(Of Func(Of TInner,TKey)), _
   ByVal resultSelector As System.Linq.Expressions.Expression(Of Func(Of TOuter,IEnumerable(Of TInner),TResult)) _
) As IIndexedSource(Of TResult)

public static IIndexedSource<TResult> GroupJoin<TOuter,TInner,TKey,TResult>( 
   IIndexedSource<TOuter> outer,
   System.Collections.Generic.IEnumerable<TInner> inner,
   System.Linq.Expressions.Expression<Func<TOuter,TKey>> outerKeySelector,
   System.Linq.Expressions.Expression<Func<TInner,TKey>> innerKeySelector,
   System.Linq.Expressions.Expression<Func<TOuter,IEnumerable<TInner>,TResult>> resultSelector
)

Parameters

outer: The first collection to join.
inner: The collection to join to the first collection.
outerKeySelector: A function to extract the join key from each element of the first collection.
innerKeySelector: A function to extract the join key from each element of the second collection.
resultSelector: A function to create a result element from an element from the first collection and a collection of matching elements from the second collection.

Type Parameters

TOuter: The type of the elements of the first collection.
TInner: The type of the elements of the second collection.
TKey: The type of the keys returned by the key selector functions.
TResult: The type of the result elements.

Return Value

An IIndexedSource<TResult> that contains elements of type TResult that are obtained by performing a grouped join on two collections.

Requirements

Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference

IndexedQueryExtensions Class
IndexedQueryExtensions Members