.net - VB.NET 中常量的容器

Question

假设我有一些相互依赖的常量，我决定将它们一起保存在一个容器中，而不是将它们作为类中的单独常量保存。

我想为该范围使用 Structure，但编译器强制我为该结构声明一个私有(private)成员。

  ' Compile error: at least one private member is needed.
  Private Structure BandSizes 
    Const BandHeight As Short = HourHeight + 20
    Const HourHeight As Short = HalfHourHeight + 20
    Const HalfHourHeight As Short = LineHeight + PictureHeight + 20
    Const PictureHeight As Short = 20
    Const LineHeight As Short = StopHeight + 10
    Const LineWidth As Short = 50
    Const StopHeight As Short = 30
  End Structure

因为我只有几个整数常量，我应该创建一个共享(静态)类吗？

平台:VB.NET (.NET 2)

Answer 1

在我看来，为此目的的最佳选择是创建一个仅包含共享的静态成员和常量的(私有(private))类。您无需创建对象，您可以根据需要控制辅助功能。

   Private NotInheritable Class BandSizes
        Public Const BandHeight As Short = HourHeight + 20
        Public Const HourHeight As Short = HalfHourHeight + 20
        Public Const HalfHourHeight As Short = LineHeight + PictureHeight + 20
        Public Const PictureHeight As Short = 20
        Public Const LineHeight As Short = StopHeight + 10
        Public Const LineWidth As Short = 50
        Public Const StopHeight As Short = 30

        Private Sub New()
        End Sub
    End Class

注意:类的声明中需要NotInheritable，因为它是编译器生成的 CIL当你使用模块时。我更喜欢“标准-.NET”方式，而不是仅使用 Visual Basic 的方式。此外，您可以更好地控制它的可访问性，并且可以将其作为内部类。这实际上是 VB.NET对应于 C# static class .