PipelineStageDefinitionBuilderLookupTInput, TForeignDocument, TOutput Method (IMongoCollectionTForeignDocument, ExpressionFuncTInput, Object, ExpressionFuncTForeignDocument, Object, ExpressionFuncTOutput, Object, AggregateLookupOptionsTForeignDocument, TOutput)

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

Public Shared Function Lookup(Of TInput, TForeignDocument, TOutput) ( 
	foreignCollection As IMongoCollection(Of TForeignDocument),
	localField As Expression(Of Func(Of TInput, 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 PipelineStageDefinition(Of TInput, TOutput)

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