# C1.LiveLinq.LiveViews.View-1.Join ## Content

Join Method

Join<TInner, TKey, TResult>(IObservableSource<TInner>, Expression<Func<T, TKey>>, Expression<Func<TInner, TKey>>, Expression<Func<T, TInner, TResult>>)

Correlates the elements of two views based on matching keys.

Declaration

public View<TResult> Join<TInner, TKey, TResult>(IObservableSource<TInner> inner, Expression<Func<T, TKey>> outerKeySelector, Expression<Func<TInner, TKey>> innerKeySelector, Expression<Func<T, TInner, TResult>> resultSelector)

Public Function Join(Of TInner, TKey, TResult)(inner As IObservableSource(Of TInner), outerKeySelector As Expression(Of Func(Of T, TKey)), innerKeySelector As Expression(Of Func(Of TInner, TKey)), resultSelector As Expression(Of Func(Of T, TInner, TResult))) As View(Of TResult)

Parameters

Type	Name	Description
IObservableSource<TInner>	inner	The collection (usually, a view) to join to this view.
Expression<Func<T, TKey>>	outerKeySelector	A function to extract the join key from each element of this view.
Expression<Func<TInner, TKey>>	innerKeySelector	A function to extract the join key from each element of the second view.
Expression<Func<T, TInner, TResult>>	resultSelector	A function to create a result element from two matching elements.

Returns

Type	Description
View<TResult>	A view containing elements of type TResult that are obtained by performing an inner join on two views.

Type Parameters

Name	Description
TInner	The type of the elements of the view to join with this view.
TKey	The type of the keys returned by the key selector functions.
TResult	The type of the result elements.