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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: 2.4.1
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
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