MongoQueryableAverageAsyncTSource Method (IMongoQueryableTSource, ExpressionFuncTSource, NullableDouble, CancellationToken) |
Computes the average of the sequence of
NullableT values that is obtained
by invoking a projection function on each element of the input sequence.
Namespace:
MongoDB.Driver.Linq
Assembly:
MongoDB.Driver (in MongoDB.Driver.dll) Version: 2.17.0+b316340e6cc3a8bfc8638dc31b54fbbfe41bfcb2
Syntaxpublic static Task<double?> AverageAsync<TSource>(
this IMongoQueryable<TSource> source,
Expression<Func<TSource, double?>> selector,
CancellationToken cancellationToken = default
)
<ExtensionAttribute>
Public Shared Function AverageAsync(Of TSource) (
source As IMongoQueryable(Of TSource),
selector As Expression(Of Func(Of TSource, Double?)),
Optional cancellationToken As CancellationToken = Nothing
) As Task(Of Double?)
[<ExtensionAttribute>]
static member AverageAsync :
source : IMongoQueryable<'TSource> *
selector : Expression<Func<'TSource, Nullable<float>>> *
?cancellationToken : CancellationToken
(* Defaults:
let _cancellationToken = defaultArg cancellationToken new CancellationToken()
*)
-> Task<Nullable<float>>
Parameters
- source
- Type: MongoDB.Driver.LinqIMongoQueryableTSource
A sequence of values. - selector
- Type: System.Linq.ExpressionsExpressionFuncTSource, NullableDouble
A projection function to apply to each element. - cancellationToken (Optional)
- Type: System.ThreadingCancellationToken
The cancellation token.
Type Parameters
- TSource
- The type of the elements of source.
Return Value
Type:
TaskNullableDouble
The average of the projected values.
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