Examples of Custom Attribute Usage
The following example defines a custom attribute that can be applied only to classes:
Example
<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
Only the constructor for the attribute class can set the properties defined in this attribute. The following code shows how you could use the attribute:
' Apply the custom attribute to this class.
<Custom("Some metadata", 66)> Class ThisClass
' Add class members here.
End Class
See Also
Tasks
How to: Define Your Own Attributes
How to: Retrieve Custom Attributes
Concepts
Retrieving Information Stored in Attributes