Click or drag to resize

MongoCollectionGroup Method (IMongoQuery, String, BsonDocument, BsonJavaScript, BsonJavaScript)

Runs the group command on this collection.

Namespace:  MongoDB.Driver
Assembly:  MongoDB.Driver.Legacy (in MongoDB.Driver.Legacy.dll) Version: 2.7.3+Branch.v2.7.x.Sha.2f1f2be13a23b8520cb9c2ee8439c022f9a03efe
Syntax
public virtual IEnumerable<BsonDocument> Group(
	IMongoQuery query,
	string key,
	BsonDocument initial,
	BsonJavaScript reduce,
	BsonJavaScript finalize
)

Parameters

query
Type: MongoDB.DriverIMongoQuery
The query (usually a QueryDocument or constructed using the Query builder).
key
Type: SystemString
The name of the field 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