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IAggregateFluentExtensions.Lookup<TResult> Method (IAggregateFluent<TResult>, IMongoCollection<BsonDocument>, BsonDocument, PipelineDefinition<BsonDocument, BsonDocument>, FieldDefinition<BsonDocument, IEnumerable<BsonDocument>>)

Appends a lookup stage to the pipeline.

Namespace:  MongoDB.Driver
Assembly:  MongoDB.Driver (in MongoDB.Driver.dll) Version: 2.20.0+ee01960089f28ea1b501690df5fc9f6318a70242
Syntax
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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.Driver.IAggregateFluent<TResult>
The aggregate.
foreignCollection
Type: MongoDB.Driver.IMongoCollection<BsonDocument>
The foreign collection.
let
Type: MongoDB.Bson.BsonDocument
The "let" definition.
lookupPipeline
Type: MongoDB.Driver.PipelineDefinition<BsonDocument, BsonDocument>
The lookup pipeline.
as
Type: MongoDB.Driver.FieldDefinition<BsonDocument, IEnumerable<BsonDocument>>
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: IAggregateFluent<BsonDocument>
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 IAggregateFluent<TResult>. 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