MongoDB .NET Driver API Documentation
Namespaces
MongoDB.Driver.Core.Operations
AbortTransactionOperation Class
AggregateExplainOperation Class
AggregateOperation(TResult) Class
AggregateToCollectionOperation Class
AsyncCursor(TDocument) Class
BulkMixedWriteOperation Class
BulkWriteConcernError Class
BulkWriteOperationError Class
BulkWriteOperationResult Class
BulkWriteOperationResult.Acknowledged Class
BulkWriteOperationResult.Unacknowledged Class
BulkWriteOperationUpsert Class
ChangeStreamOperation(TResult) Class
CommandOperationBase(TCommandResult) Class
CommitTransactionOperation Class
CountDocumentsOperation Class
CountOperation Class
CreateCollectionOperation Class
CreateIndexesOperation Class
CreateIndexRequest Class
CreateViewOperation Class
CursorType Enumeration
DatabaseExistsOperation Class
DeleteOpcodeOperation Class
DeleteRequest Class
DistinctOperation(TValue) Class
DropCollectionOperation Class
DropDatabaseOperation Class
DropIndexOperation Class
EndTransactionOperation Class
EstimatedDocumentCountOperation Class
EvalOperation Class
ExplainOperation Class
ExplainVerbosity Enumeration
FindAndModifyOperationBase(TResult) Class
FindAndModifyValueDeserializer(TResult) Class
FindOneAndDeleteOperation(TResult) Class
FindOneAndReplaceOperation(TResult) Class
FindOneAndUpdateOperation(TResult) Class
FindOperation(TDocument) Class
GeoNearOperation(TResult) Class
GeoSearchOperation(TResult) Class
GroupOperation(TResult) Class
IChangeStreamOperation(TResult) Interface
IExecutableInRetryableReadContext(TResult) Interface
IExecutableInRetryableWriteContext(TResult) Interface
IExplainableOperation Interface
IndexNameHelper Class
InsertOpcodeOperation(TDocument) Class
InsertRequest Class
IOperationClock Interface
IReadOperation(TResult) Interface
IRetryableReadOperation(TResult) Interface
IRetryableWriteOperation(TResult) Interface
IWriteOperation(TResult) Interface
ListCollectionsOperation Class
ListDatabasesOperation Class
ListIndexesOperation Class
ListIndexesUsingCommandOperation Class
MapReduceLegacyOperation Class
MapReduceOperation(TResult) Class
MapReduceOperationBase Class
MapReduceOutputMode Enumeration
MapReduceOutputToCollectionOperation Class
MongoBulkWriteOperationException Class
NoOperationClock Class
OperationExtensionMethods Class
ParallelScanOperation(TDocument) Class
PingOperation Class
ReadCommandOperation(TCommandResult) Class
ReIndexOperation Class
RenameCollectionOperation Class
RetryableDeleteCommandOperation Class
RetryableInsertCommandOperation(TDocument) Class
RetryableReadContext Class
RetryableUpdateCommandOperation Class
RetryableWriteCommandOperationBase Class
RetryableWriteContext Class
ReturnDocument Enumeration
UpdateOpcodeOperation Class
UpdateRequest Class
UpdateType Enumeration
WriteCommandOperation(TCommandResult) Class
WriteRequest Class
WriteRequestType Enumeration
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MapReduceOutputMode Enumeration

Note: This API is now obsolete.

Represents the map-reduce output mode.

Namespace:  MongoDB.Driver.Core.Operations
Assembly:  MongoDB.Driver.Core (in MongoDB.Driver.Core.dll) Version: 2.19.1+3a2a09dd959482f665ffbb5df2557ec541597af4
Syntax
Copy
[ObsoleteAttribute("Use Aggregation pipeline instead.")]
public enum MapReduceOutputMode
Members
  Member nameValueDescription
Replace0 The output of the map-reduce operation replaces the output collection.
Merge1 The output of the map-reduce operation is merged with the output collection. If an existing document has the same key as the new result, overwrite the existing document.
Reduce2 The output of the map-reduce operation is merged with the output collection. If an existing document has the same key as the new result, apply the reduce function to both the new and the existing documents and overwrite the existing document with the result.
See Also