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MongoCollectionGroup Method (IMongoQuery, BsonJavaScript, BsonDocument, BsonJavaScript, BsonJavaScript)
Runs the group command on this collection.

Namespace: MongoDB.Driver
Assembly: MongoDB.Driver.Legacy (in MongoDB.Driver.Legacy.dll) Version: 2.0.1
Syntax
public virtual IEnumerable<BsonDocument> Group(
	IMongoQuery query,
	BsonJavaScript keyFunction,
	BsonDocument initial,
	BsonJavaScript reduce,
	BsonJavaScript finalize
)

Parameters

query
Type: MongoDB.DriverIMongoQuery
The query (usually a QueryDocument or constructed using the Query builder).
keyFunction
Type: MongoDB.BsonBsonJavaScript
A JavaScript function that returns the key value to group on.
initial
Type: MongoDB.BsonBsonDocument
Initial value passed to the reduce function for each group.
reduce
Type: MongoDB.BsonBsonJavaScript
A JavaScript function that is called for each matching document in a group.
finalize
Type: MongoDB.BsonBsonJavaScript
A JavaScript function that is called at the end of the group command.

Return Value

Type: IEnumerableBsonDocument
A list of results as BsonDocuments.
See Also