不能引用类的实例成员

Question

我想使用第二个属性 LogoWidth 来设置第一个属性的宽度，但我得到“无法从共享方法引用类的实例成员” 如果有人可以帮助我将不胜感激

<DetailViewLayoutAttribute(LayoutColumnPosition.Left, "Header Logo", LayoutGroupType.SimpleEditorsGroup, 1)>
<VisibleInListView(False), DevExpress.Xpo.DisplayName("Logo"), ImmediatePostData> '<RuleRequiredField("Logo", DefaultContexts.Save)>
<ImageEditor(ListViewImageEditorMode:=ImageEditorMode.PictureEdit,
DetailViewImageEditorMode:=ImageEditorMode.PictureEdit, ListViewImageEditorCustomHeight:=85, DetailViewImageEditorFixedHeight:=160, DetailViewImageEditorFixedWidth:=160)>
<Size(SizeAttribute.Unlimited)>
    Public Property Logo() As Byte()
        Get
            Return GetPropertyValue(Of Byte())("Logo")
        End Get
        Set
            '   If True Then
            SetPropertyValue(Of Byte())("Logo", Value)
            '  End If

        End Set
    End Property

    <DetailViewLayoutAttribute(LayoutColumnPosition.Right, "Header Logo", LayoutGroupType.SimpleEditorsGroup, 1)>
    <VisibleInListView(False), DevExpress.Xpo.DisplayName("Width"), ImmediatePostData> '<RuleRequiredField("LogoWidth", DefaultContexts.Save)>
    Public Property LogoWidth As Integer
        Get
            Return _LogoWidth
        End Get
        Set(ByVal Value As Integer)
            SetPropertyValue(NameOf(LogoWidth), _LogoWidth, Value)
        End Set
    End Property}

Answer 1

这是不可能的，因为实例成员只能被实例修改/调用/可见。下面的代码为您提供了一个小概念，但在这里您可以获得更多关于https://docs.microsoft.com/en-us/dotnet/visual-basic/language-reference/modifiers/shared的信息

Class ClassTest

    Public Property TestIsCalled As Integer

    Public Sub IncreaseTestByInstance()
        TestIsCalled += 1
    End Sub

    Shared Sub IncreaseTestByEveryWhereInNameSpace()
        ' Error
        ' Error - You MUST TO increase test by an instance method not by a shared method
        ' as TestIsCalled not exist when you call here as is an Instance Member not a Shared Member  
        TestIsCalled += 1
    End Sub

End Class

因此，根据您的代码，解决方案有两种：

1. 在 例如Sub 或Function（它是什么）
2. 或更改Shared Property 中的这两个属性。

一切都取决于您的应用场景。