MongoQueryable.AverageAsync(TSource) Method (IMongoQueryable(TSource), Expression(Func(TSource, Nullable(Double))), CancellationToken) (original) (raw)
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: 2.10.0+569905ff5e778c38ea19d9d0392496a83e1704ed
Syntax
public static Task<Nullable> AverageAsync( this IMongoQueryable source, Expression<Func<TSource, Nullable>> selector, CancellationToken cancellationToken = null )
Public Shared Function AverageAsync(Of TSource) ( source As IMongoQueryable(Of TSource), selector As Expression(Of Func(Of TSource, Nullable(Of Double))), Optional cancellationToken As CancellationToken = Nothing ) As Task(Of Nullable(Of Double))[] static member AverageAsync : source : IMongoQueryable<'TSource> * selector : Expression<Func<'TSource, Nullable>> * ?cancellationToken : CancellationToken (* Defaults: let _cancellationToken = defaultArg cancellationToken null *) -> Task<Nullable>
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