IMongoCollectionTDocumentMapReduceTResult Method (BsonJavaScript, BsonJavaScript, MapReduceOptionsTDocument, TResult, CancellationToken) | 
 Note: This API is now obsolete.
            Executes a map-reduce command.
            
 
    Namespace: 
   MongoDB.Driver
    Assembly:
   MongoDB.Driver (in MongoDB.Driver.dll) Version: 2.22.0+75246110ed1247226fcc7f8eb2c54ffab745693e
Syntax[ObsoleteAttribute("Use Aggregation pipeline instead.")]
IAsyncCursor<TResult> MapReduce<TResult>(
	BsonJavaScript map,
	BsonJavaScript reduce,
	MapReduceOptions<TDocument, TResult> options = null,
	CancellationToken cancellationToken = default
)
<ObsoleteAttribute("Use Aggregation pipeline instead.")>
Function MapReduce(Of TResult) ( 
	map As BsonJavaScript,
	reduce As BsonJavaScript,
	Optional options As MapReduceOptions(Of TDocument, TResult) = Nothing,
	Optional cancellationToken As CancellationToken = Nothing
) As IAsyncCursor(Of TResult)[<ObsoleteAttribute("Use Aggregation pipeline instead.")>]
abstract MapReduce : 
        map : BsonJavaScript * 
        reduce : BsonJavaScript * 
        ?options : MapReduceOptions<'TDocument, 'TResult> * 
        ?cancellationToken : CancellationToken 
(* Defaults:
        let _options = defaultArg options null
        let _cancellationToken = defaultArg cancellationToken new CancellationToken()
*)
-> IAsyncCursor<'TResult> 
Parameters
- map
 - Type: MongoDB.BsonBsonJavaScript
The map function. - reduce
 - Type: MongoDB.BsonBsonJavaScript
The reduce function. - options (Optional)
 - Type: MongoDB.DriverMapReduceOptionsTDocument, TResult
The options. - cancellationToken (Optional)
 - Type: System.ThreadingCancellationToken
The cancellation token. 
Type Parameters
- TResult
 - The type of the result.
 
Return Value
Type: 
IAsyncCursorTResultA cursor.
See Also