在VB.net中创建VBA类

2023年6月5日 274次阅读

是否有可能(使用COM和regasm.exe)让vba函数调用vb.net函数 – 它在vb.net中创建类,然后将类传递回vba,在那里它被识别为vba类？

在VBA中,我可以使用Insert> Class Module来处理类.我已经设置了一个创建类的函数.

Private length As Double
Private height As Double
Public Sub init(ByRef hgt As Double)
  height = hgt
  length = dbl_height()
End Sub

Public Function dbl_height()
  dbl_height = height * 2
End Function

我可以使用这个函数相应地初始化它：

Public Function CreateClassFunction(foo As Integer)
  Dim my_rect As Rectangle
  Set my_rect = New Rectangle
  my_rect.init (foo)
  Set CreateClassFunction = my_rect
End Function

我也可以在vb.net中使用几乎相同的代码执行相同的操作.

Public Class Rectangle
   Private length As Double
   Private height As Double
   Public Sub init(ByRef hgt As Double)
     height = hgt
     length = dbl_height()
   End Sub

   Public Function dbl_height()
     dbl_height = height * 2
   End Function
End Class

这个vb.net函数创建类的位置：

Public Function CreateClassFunction(foo As Integer) As Rectangle
    Dim my_rect As Rectangle
    my_rect = New Rectangle
    my_rect.init(foo)
    CreateClassFunction = my_rect
End Function

我可以使用以下方法将Variant / Object / Rectangle拉入vba：

Function MyCreateClass(a As Double)
  Dim classLib As New MyAnalytics.Class1
  Set MyCreateClass = classLib.CreateClassFunction(a)
End Function

但是,此对象没有高度或长度变量. (它在观察窗口上显示“无变量”)

编辑：

修改后的代码根据Mat的Mug回答：

Public Class Rectangle
Private plength As Double
Private pheight As Double
Public Property length() As Double
    Get
        Return plength
    End Get
    Set(ByVal value As Double)
        plength = value
    End Set
End Property

Public Property height() As Double
    Get
        Return pheight
    End Get
    Set(ByVal value As Double)
        pheight = value
    End Set
End Property

Public Sub init(ByRef hgt As Double)
    height = hgt
    length = dbl_height()
End Sub

Public Function dbl_height()
    dbl_height = height * 2
End Function

End Class

并在VBA中测试：

Function MyCreateClass(a As Double)
  Dim classLib As New MyAnalytics.Class1

  Set MyCreateClass = classLib.CreateClassFunction(a)

  Debug.Print MyCreateClass.Height()
  Debug.Print MyCreateClass.length()

  MyCreateClass.Height = 30
  MyCreateClass.length = 20

  Debug.Print MyCreateClass.Height()
  Debug.Print MyCreateClass.length()

  MyCreateClass.init (100)
  Debug.Print MyCreateClass.Height()
  Debug.Print MyCreateClass.length()


End Function

最佳答案 它不会被识别为VBA类 – 它不是VBA类,而是COM对象.

您的Rectangle类具有私有字段.私人领域,私人领域.这大致是VBA所看到的：

Public Class Rectangle
   Sub init(ByRef hgt As Double)    
   Function dbl_height()
End Class

田地在哪里？

Private length As Double
Private height As Double

你还没有暴露它们 – 就VBA而言,它们并不存在.

现在,你可以将它们公之于众 – 但是你会通过暴露字段打破封装;不要那样做！

如果希望VBA代码能够更改Rectangle实例的Length和Height属性,请改为展示属性getter和setter.

点赞