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IMongoCollectionExtensionsCountTDocument Method (IMongoCollectionTDocument, 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: 2.22.0+75246110ed1247226fcc7f8eb2c54ffab745693e
Syntax
[ObsoleteAttribute("Use CountDocuments or EstimatedDocumentCount instead.")]
public static long Count<TDocument>(
	this IMongoCollection<TDocument> collection,
	Expression<Func<TDocument, bool>> filter,
	CountOptions options = null,
	CancellationToken cancellationToken = default
)

Parameters

collection
Type: MongoDB.DriverIMongoCollectionTDocument
The collection.
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: Int64
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