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

PipelineDefinitionBuilder.Group<TInput, TIntermediate, TOutput> Method (PipelineDefinition<TInput, TIntermediate>, ProjectionDefinition<TIntermediate, TOutput>)

Appends a $group stage to the pipeline.

Namespace: MongoDB.Driver
Assembly: MongoDB.Driver (in MongoDB.Driver.dll) Version: 2.21.0+5a9c3311e158910b88195f290e6d4b1b2715d2b2

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.Driver.PipelineDefinition<TInput, TIntermediate>
The pipeline.
group: Type: MongoDB.Driver.ProjectionDefinition<TIntermediate, 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: PipelineDefinition<TInput, 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 PipelineDefinition<TInput, 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