IAggregateFluentExtensions.Lookup<TResult, TForeignDocument, TAsElement, TAs, TNewResult> Method (IAggregateFluent<TResult>, IMongoCollection<TForeignDocument>, BsonDocument, PipelineDefinition<TForeignDocument, TAsElement>, Expression<Func<TNewResult, TAs>>, AggregateLookupOptions<TForeignDocument, TNewResult>)

public static IAggregateFluent<TNewResult> Lookup<TResult, TForeignDocument, TAsElement, TAs, TNewResult>(
	this IAggregateFluent<TResult> aggregate,
	IMongoCollection<TForeignDocument> foreignCollection,
	BsonDocument let,
	PipelineDefinition<TForeignDocument, TAsElement> lookupPipeline,
	Expression<Func<TNewResult, TAs>> as,
	AggregateLookupOptions<TForeignDocument, TNewResult> options = null
)
where TAs : Object, IEnumerable<TAsElement>

<ExtensionAttribute>
Public Shared Function Lookup(Of TResult, TForeignDocument, TAsElement, TAs As {Object, IEnumerable(Of TAsElement)}, TNewResult) ( 
	aggregate As IAggregateFluent(Of TResult),
	foreignCollection As IMongoCollection(Of TForeignDocument),
	let As BsonDocument,
	lookupPipeline As PipelineDefinition(Of TForeignDocument, TAsElement),
	as As Expression(Of Func(Of TNewResult, TAs)),
	Optional options As AggregateLookupOptions(Of TForeignDocument, TNewResult) = Nothing
) As IAggregateFluent(Of TNewResult)

[<ExtensionAttribute>]
static member Lookup : 
        aggregate : IAggregateFluent<'TResult> * 
        foreignCollection : IMongoCollection<'TForeignDocument> * 
        let : BsonDocument * 
        lookupPipeline : PipelineDefinition<'TForeignDocument, 'TAsElement> * 
        as : Expression<Func<'TNewResult, 'TAs>> * 
        ?options : AggregateLookupOptions<'TForeignDocument, 'TNewResult> 
(* Defaults:
        let _options = defaultArg options null
*)
-> IAggregateFluent<'TNewResult>  when 'TAs : Object and IEnumerable<'TAsElement>