Group(TInput, TIntermediate, TKey, TOutput) Method (PipelineDefinition(TInput, TIntermediate), Expression(Func(TIntermediate, TKey)), Expression(Func(IGrouping(TKey, TIntermediate), TOutput)), ExpressionTranslationOptions)

PipelineDefinitionBuilderGroupTInput, TIntermediate Method (PipelineDefinitionTInput, TIntermediate, ProjectionDefinitionTIntermediate, BsonDocument)

Appends a group stage to the pipeline.

Namespace: MongoDB.Driver
Assembly: MongoDB.Driver (in MongoDB.Driver.dll) Version: 2.16.0+eeafbea0921243a5868b81984e1083a07c1f75bc

Syntax

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public static PipelineDefinition<TInput, BsonDocument> Group<TInput, TIntermediate>(
	this PipelineDefinition<TInput, TIntermediate> pipeline,
	ProjectionDefinition<TIntermediate, BsonDocument> group
)

<ExtensionAttribute>
Public Shared Function Group(Of TInput, TIntermediate) ( 
	pipeline As PipelineDefinition(Of TInput, TIntermediate),
	group As ProjectionDefinition(Of TIntermediate, BsonDocument)
) As PipelineDefinition(Of TInput, BsonDocument)

[<ExtensionAttribute>]
static member Group : 
        pipeline : PipelineDefinition<'TInput, 'TIntermediate> * 
        group : ProjectionDefinition<'TIntermediate, BsonDocument> -> PipelineDefinition<'TInput, BsonDocument>

Parameters

pipeline: Type: MongoDB.DriverPipelineDefinitionTInput, TIntermediate
The pipeline.
group: Type: MongoDB.DriverProjectionDefinitionTIntermediate, BsonDocument
The group projection.

Type Parameters

TInput: The type of the input documents.
TIntermediate: The type of the intermediate documents.

Return Value

Type: PipelineDefinitionTInput, 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 PipelineDefinitionTInput, TIntermediate. 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).

Reference

PipelineDefinitionBuilder Class

Group Overload

MongoDB.Driver Namespace