public static Task<long> LongCountAsync<TSource>(
	this IMongoQueryable<TSource> source,
	CancellationToken cancellationToken = null
)

<ExtensionAttribute>
Public Shared Function LongCountAsync(Of TSource) ( 
	source As IMongoQueryable(Of TSource),
	Optional cancellationToken As CancellationToken = Nothing
) As Task(Of Long)

[<ExtensionAttribute>]
static member LongCountAsync : 
        source : IMongoQueryable<'TSource> * 
        ?cancellationToken : CancellationToken 
(* Defaults:
        let _cancellationToken = defaultArg cancellationToken null
*)
-> Task<int64>