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IAggregateFluentTResultLookupTForeignDocument, TAsElement, TAs, TNewResult Method (IMongoCollectionTForeignDocument, BsonDocument, PipelineDefinitionTForeignDocument, TAsElement, FieldDefinitionTNewResult, TAs, AggregateLookupOptionsTForeignDocument, TNewResult)

Appends a lookup stage to the pipeline.

Namespace:  MongoDB.Driver
Assembly:  MongoDB.Driver (in MongoDB.Driver.dll) Version: 2.13.1-v2-13-x1+a7f8afe27855f38f4f72157d11ba2ae73895502e
Syntax
IAggregateFluent<TNewResult> Lookup<TForeignDocument, TAsElement, TAs, TNewResult>(
	IMongoCollection<TForeignDocument> foreignCollection,
	BsonDocument let,
	PipelineDefinition<TForeignDocument, TAsElement> lookupPipeline,
	FieldDefinition<TNewResult, TAs> as,
	AggregateLookupOptions<TForeignDocument, TNewResult> options = null
)
where TAs : Object, IEnumerable<TAsElement>

Parameters

foreignCollection
Type: MongoDB.DriverIMongoCollectionTForeignDocument
The foreign collection.
let
Type: MongoDB.BsonBsonDocument
The "let" definition.
lookupPipeline
Type: MongoDB.DriverPipelineDefinitionTForeignDocument, TAsElement
The lookup pipeline.
as
Type: MongoDB.DriverFieldDefinitionTNewResult, TAs
The as field in TNewResult in which to place the results of the lookup pipeline.
options (Optional)
Type: MongoDB.DriverAggregateLookupOptionsTForeignDocument, TNewResult
The options.

Type Parameters

TForeignDocument
The type of the foreign collection documents.
TAsElement
The type of the as field elements.
TAs
The type of the as field.
TNewResult
The type of the new result.

Return Value

Type: IAggregateFluentTNewResult
The fluent aggregate interface.
See Also