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

Creates a $lookup stage.

Namespace:  MongoDB.Driver
Assembly:  MongoDB.Driver (in MongoDB.Driver.dll) Version: 2.12.2+a4a3888f4fb51bb518b1eb5002effc2d47f2ea6a
Syntax
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
)

Parameters

foreignCollection
Type: MongoDB.DriverIMongoCollectionTForeignDocument
The foreign collection.
localField
Type: System.Linq.ExpressionsExpressionFuncTInput, Object
The local field.
foreignField
Type: System.Linq.ExpressionsExpressionFuncTForeignDocument, Object
The foreign field.
as
Type: System.Linq.ExpressionsExpressionFuncTOutput, Object
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