public virtual ProjectionDefinition<TSource, TProjection> As<TProjection>(
	IBsonSerializer<TProjection> projectionSerializer = null
)

Public Overridable Function As(Of TProjection) ( 
	Optional projectionSerializer As IBsonSerializer(Of TProjection) = Nothing
) As ProjectionDefinition(Of TSource, TProjection)

abstract As : 
        ?projectionSerializer : IBsonSerializer<'TProjection> 
(* Defaults:
        let _projectionSerializer = defaultArg projectionSerializer null
*)
-> ProjectionDefinition<'TSource, 'TProjection> 
override As : 
        ?projectionSerializer : IBsonSerializer<'TProjection> 
(* Defaults:
        let _projectionSerializer = defaultArg projectionSerializer null
*)
-> ProjectionDefinition<'TSource, 'TProjection>