MongoQueryableGroupJoinTOuter, TInner, TKey, TResult Method (IMongoQueryableTOuter, IMongoCollectionTInner, ExpressionFuncTOuter, TKey, ExpressionFuncTInner, TKey, ExpressionFuncTOuter, IEnumerableTInner, TResult) |
Correlates the elements of two sequences based on key equality and groups the results.
Namespace:
MongoDB.Driver.Linq
Assembly:
MongoDB.Driver (in MongoDB.Driver.dll) Version: 2.19.1+3a2a09dd959482f665ffbb5df2557ec541597af4
Syntax public static IMongoQueryable<TResult> GroupJoin<TOuter, TInner, TKey, TResult>(
this IMongoQueryable<TOuter> outer,
IMongoCollection<TInner> inner,
Expression<Func<TOuter, TKey>> outerKeySelector,
Expression<Func<TInner, TKey>> innerKeySelector,
Expression<Func<TOuter, IEnumerable<TInner>, TResult>> resultSelector
)
<ExtensionAttribute>
Public Shared Function GroupJoin(Of TOuter, TInner, TKey, TResult) (
outer As IMongoQueryable(Of TOuter),
inner As IMongoCollection(Of TInner),
outerKeySelector As Expression(Of Func(Of TOuter, TKey)),
innerKeySelector As Expression(Of Func(Of TInner, TKey)),
resultSelector As Expression(Of Func(Of TOuter, IEnumerable(Of TInner), TResult))
) As IMongoQueryable(Of TResult)
[<ExtensionAttribute>]
static member GroupJoin :
outer : IMongoQueryable<'TOuter> *
inner : IMongoCollection<'TInner> *
outerKeySelector : Expression<Func<'TOuter, 'TKey>> *
innerKeySelector : Expression<Func<'TInner, 'TKey>> *
resultSelector : Expression<Func<'TOuter, IEnumerable<'TInner>, 'TResult>> -> IMongoQueryable<'TResult>
Parameters
- outer
- Type: MongoDB.Driver.LinqIMongoQueryableTOuter
The first sequence to join. - inner
- Type: MongoDB.DriverIMongoCollectionTInner
The collection to join to the first sequence. - outerKeySelector
- Type: System.Linq.ExpressionsExpressionFuncTOuter, TKey
A function to extract the join key from each element of the first sequence. - innerKeySelector
- Type: System.Linq.ExpressionsExpressionFuncTInner, TKey
A function to extract the join key from each element of the second sequence. - resultSelector
- Type: System.Linq.ExpressionsExpressionFuncTOuter, IEnumerableTInner, 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.
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.
Return Value
Type:
IMongoQueryableTResult
An
IMongoQueryableT that contains elements of type
TResult obtained by performing a grouped join on two sequences.
Usage Note
In Visual Basic and C#, you can call this method as an instance method on any object of type
IMongoQueryableTOuter. 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).
See Also