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: 2.9.0+32b058abcdf2c7e8d9dd3a676d207b31897eee2e
Syntax public 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