IMongoCollectionTDocumentCountDocumentsAsync Method (IClientSessionHandle, FilterDefinitionTDocument, CountOptions, CancellationToken) | 
  
    Namespace: 
   MongoDB.Driver
    Assembly:
   MongoDB.Driver (in MongoDB.Driver.dll) Version: 2.22.0+75246110ed1247226fcc7f8eb2c54ffab745693e
SyntaxTask<long> CountDocumentsAsync(
	IClientSessionHandle session,
	FilterDefinition<TDocument> filter,
	CountOptions options = null,
	CancellationToken cancellationToken = default
)
Function CountDocumentsAsync ( 
	session As IClientSessionHandle,
	filter As FilterDefinition(Of TDocument),
	Optional options As CountOptions = Nothing,
	Optional cancellationToken As CancellationToken = Nothing
) As Task(Of Long)
abstract CountDocumentsAsync : 
        session : IClientSessionHandle * 
        filter : FilterDefinition<'TDocument> * 
        ?options : CountOptions * 
        ?cancellationToken : CancellationToken 
(* Defaults:
        let _options = defaultArg options null
        let _cancellationToken = defaultArg cancellationToken new CancellationToken()
*)
-> Task<int64> 
Parameters
- session
 - Type: MongoDB.DriverIClientSessionHandle
The session. - filter
 - Type: MongoDB.DriverFilterDefinitionTDocument
The filter. - options (Optional)
 - Type: MongoDB.DriverCountOptions
The options. - cancellationToken (Optional)
 - Type: System.ThreadingCancellationToken
The cancellation token. 
Return Value
Type: 
TaskInt64
             The number of documents in the collection.
             
Remarks
             Note: when migrating from CountAsync to CountDocumentsAsync the following query operations must be replaced:
            
             
+-------------+--------------------------------+
| Operator    | Replacement                    |
+=============+================================+
| $where      |  $expr                         |
+-------------+--------------------------------+
| $near       |  $geoWithin with $center       |
+-------------+--------------------------------+
| $nearSphere |  $geoWithin with $centerSphere |
+-------------+--------------------------------+
See Also