| IMongoCollectionExtensionsCountAsyncTDocument Method (IMongoCollectionTDocument, IClientSessionHandle, ExpressionFuncTDocument, Boolean, CountOptions, CancellationToken) | 
 Note: This API is now obsolete.
            Counts the number of documents in the collection.
            
 
    Namespace: 
   MongoDB.Driver
    Assembly:
   MongoDB.Driver (in MongoDB.Driver.dll) Version: 2.11.0+cb27a82ea70620ad1acad8058809be8302ae4f2a
 Syntax
Syntax[ObsoleteAttribute("Use CountDocumentsAsync or EstimatedDocumentCountAsync instead.")]
public static Task<long> CountAsync<TDocument>(
	this IMongoCollection<TDocument> collection,
	IClientSessionHandle session,
	Expression<Func<TDocument, bool>> filter,
	CountOptions options = null,
	CancellationToken cancellationToken = null
)
<ExtensionAttribute>
<ObsoleteAttribute("Use CountDocumentsAsync or EstimatedDocumentCountAsync instead.")>
Public Shared Function CountAsync(Of TDocument) ( 
	collection As IMongoCollection(Of TDocument),
	session As IClientSessionHandle,
	filter As Expression(Of Func(Of TDocument, Boolean)),
	Optional options As CountOptions = Nothing,
	Optional cancellationToken As CancellationToken = Nothing
) As Task(Of Long)[<ExtensionAttribute>]
[<ObsoleteAttribute("Use CountDocumentsAsync or EstimatedDocumentCountAsync instead.")>]
static member CountAsync : 
        collection : IMongoCollection<'TDocument> * 
        session : IClientSessionHandle * 
        filter : Expression<Func<'TDocument, bool>> * 
        ?options : CountOptions * 
        ?cancellationToken : CancellationToken 
(* Defaults:
        let _options = defaultArg options null
        let _cancellationToken = defaultArg cancellationToken null
*)
-> Task<int64> 
Parameters
- collection
- Type: MongoDB.DriverIMongoCollectionTDocument
 The collection.
- session
- Type: MongoDB.DriverIClientSessionHandle
 The session.
- filter
- Type: System.Linq.ExpressionsExpressionFuncTDocument, Boolean
 The filter.
- options (Optional)
- Type: MongoDB.DriverCountOptions
 The options.
- cancellationToken (Optional)
- Type: System.ThreadingCancellationToken
 The cancellation token.
Type Parameters
- TDocument
- The type of the document.
Return Value
Type: 
TaskInt64
            The number of documents in the collection.
            
Usage Note
In Visual Basic and C#, you can call this method as an instance method on any object of type 
IMongoCollectionTDocument. When you use instance method syntax to call this method, omit the first parameter. For more information, see 
Extension Methods (Visual Basic) or 
Extension Methods (C# Programming Guide).
 See Also
See Also