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

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

Appends a $group stage to the pipeline.

Namespace: MongoDB.Driver
Assembly: MongoDB.Driver (in MongoDB.Driver.dll) Version: 2.6.0+Branch.origin/v2.6.x.Sha.593796a7b35dc59243383bcc684de296a5468f2e

Syntax

Copy

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

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

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

Parameters

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

Type Parameters

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

Return Value

Type: PipelineDefinitionTInput, TOutput
A new pipeline with an additional stage.

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