具有属性构造函数的命名参数

Named parameters with attribute constructors

阅读有关使用属性的文档:https://docs.microsoft.com/en-us/dotnet/visual-basic/programming-guide/concepts/attributes/,它说允许使用命名参数。我读到它作为构造函数的命名参数,但这似乎不起作用:

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

属性是否不支持 vb 中构造函数的命名参数,或者我只是缺少正确的语法?

实际的构造函数参数没有命名。命名参数用于设置属性。您可以将其视为非常像常规代码中的对象初始化器:

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

构造函数参数是该文档中引用的位置参数,然后命名参数是您可以设置也可以不设置的属性。