PipelineDefinitionBuilder.Lookup<TInput, TIntermediate, TForeignDocument, TOutput> Method (PipelineDefinition<TInput, TIntermediate>, IMongoCollection<TForeignDocument>, Expression<Func<TIntermediate, Object>>, Expression<Func<TForeignDocument, Object>>, Expression<Func<TOutput, Object>>, AggregateLookupOptions<TForeignDocument, TOutput>)

public static PipelineDefinition<TInput, TOutput> Lookup<TInput, TIntermediate, TForeignDocument, TOutput>(
	this PipelineDefinition<TInput, TIntermediate> pipeline,
	IMongoCollection<TForeignDocument> foreignCollection,
	Expression<Func<TIntermediate, Object>> localField,
	Expression<Func<TForeignDocument, Object>> foreignField,
	Expression<Func<TOutput, Object>> as,
	AggregateLookupOptions<TForeignDocument, TOutput> options = null
)

<ExtensionAttribute>
Public Shared Function Lookup(Of TInput, TIntermediate, TForeignDocument, TOutput) ( 
	pipeline As PipelineDefinition(Of TInput, TIntermediate),
	foreignCollection As IMongoCollection(Of TForeignDocument),
	localField As Expression(Of Func(Of TIntermediate, Object)),
	foreignField As Expression(Of Func(Of TForeignDocument, Object)),
	as As Expression(Of Func(Of TOutput, Object)),
	Optional options As AggregateLookupOptions(Of TForeignDocument, TOutput) = Nothing
) As PipelineDefinition(Of TInput, TOutput)

[<ExtensionAttribute>]
static member Lookup : 
        pipeline : PipelineDefinition<'TInput, 'TIntermediate> * 
        foreignCollection : IMongoCollection<'TForeignDocument> * 
        localField : Expression<Func<'TIntermediate, Object>> * 
        foreignField : Expression<Func<'TForeignDocument, Object>> * 
        as : Expression<Func<'TOutput, Object>> * 
        ?options : AggregateLookupOptions<'TForeignDocument, 'TOutput> 
(* Defaults:
        let _options = defaultArg options null
*)
-> PipelineDefinition<'TInput, 'TOutput>