IAggregateFluentExtensionsLookupTResult, TForeignDocument, TAsElement, TAs, TNewResult Method (IAggregateFluentTResult, IMongoCollectionTForeignDocument, BsonDocument, PipelineDefinitionTForeignDocument, TAsElement, ExpressionFuncTNewResult, TAs, AggregateLookupOptionsTForeignDocument, TNewResult) |
Appends a lookup stage to the pipeline.
Namespace:
MongoDB.Driver
Assembly:
MongoDB.Driver (in MongoDB.Driver.dll) Version: 2.8.0+cc573f3e1f48f39162b4b680e921a623e127e8fa
Syntax public static IAggregateFluent<TNewResult> Lookup<TResult, TForeignDocument, TAsElement, TAs, TNewResult>(
this IAggregateFluent<TResult> aggregate,
IMongoCollection<TForeignDocument> foreignCollection,
BsonDocument let,
PipelineDefinition<TForeignDocument, TAsElement> lookupPipeline,
Expression<Func<TNewResult, TAs>> as,
AggregateLookupOptions<TForeignDocument, TNewResult> options = null
)
where TAs : Object, IEnumerable<TAsElement>
<ExtensionAttribute>
Public Shared Function Lookup(Of TResult, TForeignDocument, TAsElement, TAs As {Object, IEnumerable(Of TAsElement)}, TNewResult) (
aggregate As IAggregateFluent(Of TResult),
foreignCollection As IMongoCollection(Of TForeignDocument),
let As BsonDocument,
lookupPipeline As PipelineDefinition(Of TForeignDocument, TAsElement),
as As Expression(Of Func(Of TNewResult, TAs)),
Optional options As AggregateLookupOptions(Of TForeignDocument, TNewResult) = Nothing
) As IAggregateFluent(Of TNewResult)
[<ExtensionAttribute>]
static member Lookup :
aggregate : IAggregateFluent<'TResult> *
foreignCollection : IMongoCollection<'TForeignDocument> *
let : BsonDocument *
lookupPipeline : PipelineDefinition<'TForeignDocument, 'TAsElement> *
as : Expression<Func<'TNewResult, 'TAs>> *
?options : AggregateLookupOptions<'TForeignDocument, 'TNewResult>
(* Defaults:
let _options = defaultArg options null
*)
-> IAggregateFluent<'TNewResult> when 'TAs : Object and IEnumerable<'TAsElement>
Parameters
- aggregate
- Type: MongoDB.DriverIAggregateFluentTResult
The aggregate. - foreignCollection
- Type: MongoDB.DriverIMongoCollectionTForeignDocument
The foreign collection. - let
- Type: MongoDB.BsonBsonDocument
The "let" definition. - lookupPipeline
- Type: MongoDB.DriverPipelineDefinitionTForeignDocument, TAsElement
The lookup pipeline. - as
- Type: System.Linq.ExpressionsExpressionFuncTNewResult, TAs
The as field in TNewResult in which to place the results of the lookup pipeline. - options (Optional)
- Type: MongoDB.DriverAggregateLookupOptionsTForeignDocument, TNewResult
The options.
Type Parameters
- TResult
- The type of the result.
- TForeignDocument
- The type of the foreign collection documents.
- TAsElement
- The type of the as field elements.
- TAs
- The type of the as field.
- TNewResult
- The type of the new result.
Return Value
Type:
IAggregateFluentTNewResultThe 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