PipelineDefinitionBuilder.Group<TInput, TIntermediate, TKey, TOutput> Method (PipelineDefinition<TInput, TIntermediate>, Expression<Func<TIntermediate, TKey>>, Expression<Func<IGrouping<TKey, TIntermediate>, TOutput>>, ExpressionTranslationOptions) |
Appends a group stage to the pipeline (this method can only be used with LINQ2).
Namespace:
MongoDB.Driver
Assembly:
MongoDB.Driver (in MongoDB.Driver.dll) Version: 2.21.0+5a9c3311e158910b88195f290e6d4b1b2715d2b2
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.Driver.PipelineDefinition<TInput, TIntermediate>
The pipeline. - id
- Type: System.Linq.Expressions.Expression<Func<TIntermediate, TKey>>
The id. - group
- Type: System.Linq.Expressions.Expression<Func<IGrouping<TKey, TIntermediate>, TOutput>>
The group projection. - translationOptions (Optional)
- Type: MongoDB.Driver.ExpressionTranslationOptions
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:
PipelineDefinition<TInput,
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
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).
RemarksThis method can only be used with LINQ2 but that can't be verified until Render is called.
See Also