更新:2007 年 11 月
下面的示例定义只能应用于类的自定义属性:
示例
<AttributeUsage(AttributeTargets.Class)> Public Class CustomAttribute
    Inherits System.Attribute
    'Declare two private fields to store the property values.
    Private m_LlabelValue As String
    Private m_VValueValue As Integer
    'The Sub New constructor is the only way to set the properties.
    Public Sub New(ByVal _Label As String, ByVal _Value As Integer)
        m_LlabelValue = _Label
        m_VValueValue = _Value
    End Sub
    Public ReadOnly Property Label() As String
        Get
            Return m_LlabelValue
        End Get
    End Property
    Public ReadOnly Property Value() As Integer
        Get
            Return m_VValueValue
        End Get
    End Property
End Class
只有属性 (Attribute) 类的构造函数可以设置在此属性 (Attribute) 中定义的属性 (Property)。下面的代码展示可以如何使用该属性:
' Apply the custom attribute to this class.
<Custom("Some metadata", 66)> Class ThisClass
    ' Add class members here.
End Class