Named parameters with attribute constructors

Reading the documentation on using attributes: https://learn.microsoft.com/en-us/dotnet/visual-basic/programming-guide/concepts/attributes/, and it says that named parameters are allowed. I read that that as named parameters to the constructor, but that doesn't seem to work:

Public Class FullName
    Inherits System.Attribute
    Public Property Name As String
    Public Property Hey As String
    Sub New(FirstName As String, LastName As String)
        Name = FirstName + " " + LastName
    End Sub
End Class

<FullName(LastName:="moreno", FirstName:="John", Hey:="joe")>
Public Class Example
   Public Sub Test
      Dim x = New FullName(LastName:="moreno", FirstName:="john")
   End Sub 
End Class

Do attributes not support named parameters for the constructor in vb, or am I just missing the right syntax?

Solution

The actual constructor parameters do not get named. Named parameters are for setting properties. You can think of it as being much like an object initialiser in regular code:

Dim fn As New FullName("John", "moreno") With {.Hey = "joe"}

<FullName("John", "moreno", Hey:="joe")>

The constructor parameters are the positional parameters referred to in that documentation and then named parameters are properties that you may or may not set.