what is the difference between internal and private

In F# what is the diff开发者_Go百科erence between an internal method and a private method.

I have a feeling that they are implemented the same, but mean something different.

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An internal method can be accessed from any type (or function) in the same .NET assembly.
A private method can be accessed only from the type where it was declared.

Here is a simple snippet that shows the difference:

type A() = 
  member internal x.Foo = 1

type B() = 
  member private x.Foo = 1

let a = A()
let b = B()
a.Foo // Works fine (we're in the same project)
b.Foo // Error FS0491: 'Foo' is not defined

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internal is the same as public, except that it is only visible inside the assembly it is delcared in. Private is only visible inside the declaring type.

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internal instances can be accessed throughout the same assembly, while private instances can be accessed "ONLY" in the defining class.