Defining Your Own Attributes
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Defining Your Own Attributes

Using attribute classes, you can create your own custom attributes, and use them in addition to the .NET Framework attributes to provide additional information about program elements.

To define a custom attribute

  1. Declare a class and apply the AttributeUsage attribute to it. The name of your class is the name of the new attribute, as shown in the following code:
    <AttributeUsage(AttributeTargets.All)> Class TestAttribute
    
  2. Add an Inherits System.Attribute statement as the first line of code in the class:
    Inherits System.Attribute
    
  3. Define Private fields to store property values:
    Private m_SomeValue As String
    
  4. If appropriate, create a constructor for the attribute:
    Public Sub New(ByVal Value As String)
       m_SomeValue = Value
    End Sub
    
  5. Define methods, fields, and properties for the attribute:
    Public Sub Attr(ByVal AttrValue As String)
       'Add method code here.
    End Sub
    Public Property SomeValue() As String  ' A named parameter.
       Get
          Return m_SomeValue
       End Get
       Set(ByVal Value As String)
          m_SomeValue = Value
       End Set
    End Property
    
  6. End the class with the End Class construct:
    End Class
    

See Also

Application of Attributes | Object Lifetime: How Objects Are Created and Destroyed | AttributeUsageAttribute Class

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