| PipelineDefinitionBuilderGroupTInput, TIntermediate, TKey, TOutput Method (PipelineDefinitionTInput, TIntermediate, ExpressionFuncTIntermediate, TKey, ExpressionFuncIGroupingTKey, TIntermediate, TOutput, ExpressionTranslationOptions) | 
 
            Appends a group stage to the pipeline.
            
 
    Namespace: 
   MongoDB.Driver
    Assembly:
   MongoDB.Driver (in MongoDB.Driver.dll) Version: 2.12.2+a4a3888f4fb51bb518b1eb5002effc2d47f2ea6a
 Syntax
Syntaxpublic static PipelineDefinition<TInput, TOutput> Group<TInput, TIntermediate, TKey, TOutput>(
	this PipelineDefinition<TInput, TIntermediate> pipeline,
	Expression<Func<TIntermediate, TKey>> id,
	Expression<Func<IGrouping<TKey, TIntermediate>, TOutput>> group,
	ExpressionTranslationOptions translationOptions = null
)
<ExtensionAttribute>
Public Shared Function Group(Of TInput, TIntermediate, TKey, TOutput) ( 
	pipeline As PipelineDefinition(Of TInput, TIntermediate),
	id As Expression(Of Func(Of TIntermediate, TKey)),
	group As Expression(Of Func(Of IGrouping(Of TKey, TIntermediate), TOutput)),
	Optional translationOptions As ExpressionTranslationOptions = Nothing
) As PipelineDefinition(Of TInput, TOutput)
[<ExtensionAttribute>]
static member Group : 
        pipeline : PipelineDefinition<'TInput, 'TIntermediate> * 
        id : Expression<Func<'TIntermediate, 'TKey>> * 
        group : Expression<Func<IGrouping<'TKey, 'TIntermediate>, 'TOutput>> * 
        ?translationOptions : ExpressionTranslationOptions 
(* Defaults:
        let _translationOptions = defaultArg translationOptions null
*)
-> PipelineDefinition<'TInput, 'TOutput> 
Parameters
- pipeline
- Type: MongoDB.DriverPipelineDefinitionTInput, TIntermediate
 The pipeline.
- id
- Type: System.Linq.ExpressionsExpressionFuncTIntermediate, TKey
 The id.
- group
- Type: System.Linq.ExpressionsExpressionFuncIGroupingTKey, TIntermediate, TOutput
 The group projection.
- translationOptions (Optional)
- Type: MongoDB.DriverExpressionTranslationOptions
 The translation options.
Type Parameters
- TInput
- The type of the input documents.
- TIntermediate
- The type of the intermediate documents.
- TKey
- The type of the key.
- TOutput
- The type of the output documents.
Return Value
Type: 
PipelineDefinitionTInput, 
TOutput
            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).
 See Also
See Also