Question

I have a bunch of modules that export an IModule interface. So in the main program I have no problems

...
let mutable modules = Seq.empty
[<ImportMany>]
member x.Modules
    with get():IEnumerable<Lazy<IModule, IModuleData>> = modules
    and set(a) = modules <- a
...

But now I need to expose an interface back to those modules. So each module will import a single interface

...
let mutable parent:IParent = ?
[<Import>]
member x.Parent
    with get():IParent = parent
    and set(a) = parent <- a
...

So my problem is how do I go about creating my mutable “parent” when I have no initial value for it? Also, is this the appropriate way to expose an API back to component parts?

Answer 1

let mutable parent = Unchecked.defaultof<IParent>

should do the trick.