MongoQueryableCountAsyncTSource Method (IMongoQueryableTSource, ExpressionFuncTSource, Boolean, CancellationToken) |
Returns the number of elements in the specified sequence that satisfies a condition.
Namespace:
MongoDB.Driver.Linq
Assembly:
MongoDB.Driver (in MongoDB.Driver.dll) Version: 2.8.0+cc573f3e1f48f39162b4b680e921a623e127e8fa
Syntax public static Task<int> CountAsync<TSource>(
this IMongoQueryable<TSource> source,
Expression<Func<TSource, bool>> predicate,
CancellationToken cancellationToken = null
)
<ExtensionAttribute>
Public Shared Function CountAsync(Of TSource) (
source As IMongoQueryable(Of TSource),
predicate As Expression(Of Func(Of TSource, Boolean)),
Optional cancellationToken As CancellationToken = Nothing
) As Task(Of Integer)
[<ExtensionAttribute>]
static member CountAsync :
source : IMongoQueryable<'TSource> *
predicate : Expression<Func<'TSource, bool>> *
?cancellationToken : CancellationToken
(* Defaults:
let _cancellationToken = defaultArg cancellationToken null
*)
-> Task<int>
Parameters
- source
- Type: MongoDB.Driver.LinqIMongoQueryableTSource
An IMongoQueryableT that contains the elements to be counted. - predicate
- Type: System.Linq.ExpressionsExpressionFuncTSource, Boolean
A function to test each element for a condition. - cancellationToken (Optional)
- Type: System.ThreadingCancellationToken
The cancellation token.
Type Parameters
- TSource
- The type of the elements of source.
Return Value
Type:
TaskInt32
The number of elements in the sequence that satisfies the condition in the predicate function.
Usage Note
In Visual Basic and C#, you can call this method as an instance method on any object of type
IMongoQueryableTSource. 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