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PipelineDefinitionBuilderGroupTInput, TIntermediate, TKey, TOutput Method (PipelineDefinitionTInput, TIntermediate, ExpressionFuncTIntermediate, TKey, ExpressionFuncIGroupingTKey, 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: 2.22.0+75246110ed1247226fcc7f8eb2c54ffab745693e
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
)

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
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).
Remarks
This method can only be used with LINQ2 but that can't be verified until Render is called.
See Also