MongoQueryableSumAsyncTSource Method (IMongoQueryableTSource, ExpressionFuncTSource, NullableInt64, CancellationToken)

public static Task<long?> SumAsync<TSource>(
	this IMongoQueryable<TSource> source,
	Expression<Func<TSource, long?>> selector,
	CancellationToken cancellationToken = default
)

<ExtensionAttribute>
Public Shared Function SumAsync(Of TSource) ( 
	source As IMongoQueryable(Of TSource),
	selector As Expression(Of Func(Of TSource, Long?)),
	Optional cancellationToken As CancellationToken = Nothing
) As Task(Of Long?)

[<ExtensionAttribute>]
static member SumAsync : 
        source : IMongoQueryable<'TSource> * 
        selector : Expression<Func<'TSource, Nullable<int64>>> * 
        ?cancellationToken : CancellationToken 
(* Defaults:
        let _cancellationToken = defaultArg cancellationToken new CancellationToken()
*)
-> Task<Nullable<int64>>