PipelineStageDefinitionBuilderLookupTInput, TForeignDocument, TOutput Method (IMongoCollectionTForeignDocument, ExpressionFuncTInput, Object, ExpressionFuncTForeignDocument, Object, ExpressionFuncTOutput, Object, AggregateLookupOptionsTForeignDocument, TOutput) |
Creates a $lookup stage.
Namespace: MongoDB.DriverAssembly: MongoDB.Driver (in MongoDB.Driver.dll) Version: 2.4.1
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
)
Public Shared Function Lookup(Of TInput, TForeignDocument, TOutput) (
foreignCollection As IMongoCollection(Of TForeignDocument),
localField As Expression(Of Func(Of TInput, Object)),
foreignField As Expression(Of Func(Of TForeignDocument, Object)),
as As Expression(Of Func(Of TOutput, Object)),
Optional options As AggregateLookupOptions(Of TForeignDocument, TOutput) = Nothing
) As PipelineStageDefinition(Of TInput, TOutput)
static member Lookup :
foreignCollection : IMongoCollection<'TForeignDocument> *
localField : Expression<Func<'TInput, Object>> *
foreignField : Expression<Func<'TForeignDocument, Object>> *
as : Expression<Func<'TOutput, Object>> *
?options : AggregateLookupOptions<'TForeignDocument, 'TOutput>
(* Defaults:
let _options = defaultArg options null
*)
-> PipelineStageDefinition<'TInput, 'TOutput>
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,
TOutputThe stage.
See Also