Method GroupJoin

Namespace

MongoDB.Driver.Linq

Assembly

MongoDB.Driver.dll

GroupJoin<TOuter, TInner, TKey, TResult>(IQueryable<TOuter>, IMongoCollection<TInner>, Expression<Func<TOuter, TKey>>, Expression<Func<TInner, TKey>>, Expression<Func<TOuter, IEnumerable<TInner>, TResult>>)

Correlates the elements of two sequences based on key equality and groups the results.

public static IQueryable<TResult> GroupJoin<TOuter, TInner, TKey, TResult>(this IQueryable<TOuter> outer, IMongoCollection<TInner> inner, Expression<Func<TOuter, TKey>> outerKeySelector, Expression<Func<TInner, TKey>> innerKeySelector, Expression<Func<TOuter, IEnumerable<TInner>, TResult>> resultSelector)

Parameters

outer IQueryable<TOuter>

The first sequence to join.

inner IMongoCollection<TInner>

The collection to join to the first sequence.

outerKeySelector Expression<Func<TOuter, TKey>>

A function to extract the join key from each element of the first sequence.

innerKeySelector Expression<Func<TInner, TKey>>

A function to extract the join key from each element of the second sequence.

resultSelector Expression<Func<TOuter, IEnumerable<TInner>, TResult>>

A function to create a result element from an element from the first sequence and a collection of matching elements from the second sequence.

Returns

IQueryable<TResult>

An IQueryable<T> that contains elements of type TResult obtained by performing a grouped join on two sequences.

Type Parameters

TOuter

The type of the elements of the first sequence.

TInner

The type of the elements of the second sequence.

TKey

The type of the keys returned by the key selector functions.

TResult

The type of the result elements.