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IMongoCollectionExtensionsCountAsyncTDocument Method (IMongoCollectionTDocument, IClientSessionHandle, ExpressionFuncTDocument, Boolean, CountOptions, CancellationToken)

Counts the number of documents in the collection.

Namespace:  MongoDB.Driver
Assembly:  MongoDB.Driver (in MongoDB.Driver.dll) Version: 2.5.0+57.Branch.master.Sha.6a4e00a2d91090c65a9b11364b9ebfdb9c7da076
Syntax
public static Task<long> CountAsync<TDocument>(
	this IMongoCollection<TDocument> collection,
	IClientSessionHandle session,
	Expression<Func<TDocument, bool>> filter,
	CountOptions options = null,
	CancellationToken cancellationToken = null
)

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