Статья
11/18/2011

AttributeUsageAttribute Constructor

Microsoft Silverlight will reach end of support after October 2021. Learn more.

Initializes a new instance of the AttributeUsageAttribute class with the specified list of AttributeTargets, the AllowMultiple value, and the Inherited value.

Namespace: System
Assembly: mscorlib (in mscorlib.dll)

Syntax

'Declaration
Public Sub New ( _
    validOn As AttributeTargets _
)

public AttributeUsageAttribute(
    AttributeTargets validOn
)

Parameters

validOn
Type: System.AttributeTargets
The set of values combined using a bitwise OR operation to indicate which program elements are valid.

Remarks

You can combine several AttributeTargets values using a bitwise OR operation to get the desired combination of valid program elements.

For default property values, see the ValidOn, AllowMultiple, and Inherited properties.

Examples

The definition of the DispId attribute illustrates the use of a bitwise OR operation to combine several AttributeTargets values.

Imports System
<AttributeUsage(AttributeTargets.Method _
Or AttributeTargets.Field _
Or AttributeTargets.Property)> _
Public Class DispIdAttribute
Inherits System.Attribute

Public Sub New(ByVal value As Integer)
 ' . . .
End Sub

Public ReadOnly Property Value() As Integer
 Get
    ' . . .
    Return 0
 End Get
End Property
End Class

[AttributeUsage(AttributeTargets.Method | AttributeTargets.Field |
AttributeTargets.Property)]
public class DispIdAttribute : System.Attribute
{
  public DispIdAttribute(int value)
  {
     // . . .
  }

  public int Value
  {
     get
     {
        // . . .
        return 0;
     }
  }
}

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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