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PipelineStageDefinitionBuilderLookupTInput, TForeignDocument, TOutput Method (IMongoCollectionTForeignDocument, FieldDefinitionTInput, FieldDefinitionTForeignDocument, FieldDefinitionTOutput, AggregateLookupOptionsTForeignDocument, TOutput)

Creates a $lookup stage.

Namespace:  MongoDB.Driver
Assembly:  MongoDB.Driver (in MongoDB.Driver.dll) Version: 2.15.0+f503bf610759c13f78cff9a3c01e91453185d2ed
Syntax
public static PipelineStageDefinition<TInput, TOutput> Lookup<TInput, TForeignDocument, TOutput>(
	IMongoCollection<TForeignDocument> foreignCollection,
	FieldDefinition<TInput> localField,
	FieldDefinition<TForeignDocument> foreignField,
	FieldDefinition<TOutput> as,
	AggregateLookupOptions<TForeignDocument, TOutput> options = null
)

Parameters

foreignCollection
Type: MongoDB.DriverIMongoCollectionTForeignDocument
The foreign collection.
localField
Type: MongoDB.DriverFieldDefinitionTInput
The local field.
foreignField
Type: MongoDB.DriverFieldDefinitionTForeignDocument
The foreign field.
as
Type: MongoDB.DriverFieldDefinitionTOutput
The "as" field.
options (Optional)
Type: MongoDB.DriverAggregateLookupOptionsTForeignDocument, TOutput
The options.

Type Parameters

TInput
The type of the input documents.
TForeignDocument
The type of the foreign collection documents.
TOutput
The type of the output documents.

Return Value

Type: PipelineStageDefinitionTInput, TOutput
The stage.
See Also