是否可以在F＃中的单个语句中打开给定模块的所有子模块？

Question

I have something like this at some part in my app:

open ModuleX
open ModuleX.Submodule1
open ModuleX.Submodule2
open ModuleX.Submodule3
open ModuleX.Submodule4
open ModuleX.Submodule5
open ModuleX.Submodule6

Is there some way of simply doing:

open ModuleX
open ModuleX.*

The worst case in my app is a module that has 27 lines of module opening statements. I could break it into different files, but I would only be splitting the openings into different files, not really solving anything. Would you advice to "merge" submodules? Auto open wouldn't be okay for my case.

Or is it just something anyone doing F# has to deal with?

Answer 1

There is no way to control this at the point of opening, but you can make these modules "automatically openable" at their declaration point. To do this, decorate them with [<AutoOpen>] :

module A =

  [<AutoOpen>]
  module B =
    let x = 5

  module C =
    let y = 6

open A

let z = x   // x is now available
let u = C.y // y still requires qualified access

People who bought [<AutoOpen>] also liked [<RequireQualifiedAccess>] :-)

[<RequireQualifiedAccess>]
module C =
  let y = 6

open C // Compiler error