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IAggregateFluentExtensionsLookupTResult Method (IAggregateFluentTResult, IMongoCollectionBsonDocument, BsonDocument, PipelineDefinitionBsonDocument, BsonDocument, FieldDefinitionBsonDocument, IEnumerableBsonDocument)

Appends a lookup stage to the pipeline.

Namespace:  MongoDB.Driver
Assembly:  MongoDB.Driver (in MongoDB.Driver.dll) Version: 2.22.0+75246110ed1247226fcc7f8eb2c54ffab745693e
Syntax
public static IAggregateFluent<BsonDocument> Lookup<TResult>(
	this IAggregateFluent<TResult> aggregate,
	IMongoCollection<BsonDocument> foreignCollection,
	BsonDocument let,
	PipelineDefinition<BsonDocument, BsonDocument> lookupPipeline,
	FieldDefinition<BsonDocument, IEnumerable<BsonDocument>> as
)

Parameters

aggregate
Type: MongoDB.DriverIAggregateFluentTResult
The aggregate.
foreignCollection
Type: MongoDB.DriverIMongoCollectionBsonDocument
The foreign collection.
let
Type: MongoDB.BsonBsonDocument
The "let" definition.
lookupPipeline
Type: MongoDB.DriverPipelineDefinitionBsonDocument, BsonDocument
The lookup pipeline.
as
Type: MongoDB.DriverFieldDefinitionBsonDocument, IEnumerableBsonDocument
The as field in the result in which to place the results of the lookup pipeline.

Type Parameters

TResult
The type of the result.

Return Value

Type: IAggregateFluentBsonDocument
The fluent aggregate interface.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IAggregateFluentTResult. 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