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IAggregateFluentExtensions.Group<TResult, TKey, TNewResult> Method (IAggregateFluent<TResult>, Expression<Func<TResult, TKey>>, Expression<Func<IGrouping<TKey, TResult>, TNewResult>>)

Appends a group stage to the pipeline.

Namespace:  MongoDB.Driver
Assembly:  MongoDB.Driver (in MongoDB.Driver.dll) Version: 2.21.0+5a9c3311e158910b88195f290e6d4b1b2715d2b2
Syntax
public static IAggregateFluent<TNewResult> Group<TResult, TKey, TNewResult>(
	this IAggregateFluent<TResult> aggregate,
	Expression<Func<TResult, TKey>> id,
	Expression<Func<IGrouping<TKey, TResult>, TNewResult>> group
)

Parameters

aggregate
Type: MongoDB.Driver.IAggregateFluent<TResult>
The aggregate.
id
Type: System.Linq.Expressions.Expression<Func<TResult, TKey>>
The id.
group
Type: System.Linq.Expressions.Expression<Func<IGrouping<TKey, TResult>, TNewResult>>
The group projection.

Type Parameters

TResult
The type of the result.
TKey
The type of the key.
TNewResult
The type of the new result.

Return Value

Type: IAggregateFluent<TNewResult>
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 IAggregateFluent<TResult>. 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