How to access protected member

问题:

I have following code in extending type (in F#) which invokes a protected method of a class it inherits from (in C#) but I get the exception (see below). Is there a workaround for this?

let getPagereference id =
    this.ConstructPageReference(id)

The member or object constructor 'ConstructPageReference' is not accessible. Private members may only be accessed from within the declaring type. Protected members may only be accessed from an extending type and cannot be accessed from inner lambda expressions.

Update:

I have tried following but getting the same result

let getPagereference id =
    base.ConstructPageReference(id)

Update 2 (solution):

here is the code as it was:

type MyNewType() =
    inherit SomeAbstractType()

    let getPagereference id =
        base.ConstructPageReference(id)

    override this.SomeMethod()=
       let id = 0
       let pr = getPagereference id

this is how it should have been:

type MyNewType() =
    inherit SomeAbstractType()

    member this.ConstructPageReference(id) =
        base.ConstructPageReference(id)

    override this.SomeMethod()=
       let id = 0
       let pr = this.ConstructPageReference(id)

回答1:

Gabe is correct. Your code:

let getPagereference id =
  this.ConstructPageReference(id)

is the same as

let getPagereference = fun id ->
  this.ConstructPageReference(id)

and you are therefore implicitly attempting to call a base method from within a lambda expression. You will need to do this from a member, rather than a let-bound function.

回答2:

I bet the key part is the cannot be accessed from inner lambda expressions. You are probably trying to do the access from within a lambda.

Have you tried

member this.getPagereference(id) = 
    this.ConstructPageReference(id)