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AttributeUsageAttribute Class

Specifies the usage of another attribute class. This class cannot be inherited.

For a list of all members of this type, see AttributeUsageAttribute Members.


[Visual Basic]
NotInheritable Public Class AttributeUsageAttribute
   Inherits Attribute
public sealed class AttributeUsageAttribute : Attribute
public __gc __sealed class AttributeUsageAttribute : public
class AttributeUsageAttribute extends Attribute

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.


When you are defining your own attribute class, you can control the manner in which it is used by placing an AttributeUsageAttribute on your attribute class. The indicated attribute class must derive from Attribute, either directly or indirectly.

Attribute classes have positional and named parameters. Each public constructor for an attribute class defines a valid sequence of positional parameters for that class. Named parameters are defined by the non-static, public, and read-write fields or properties of the attribute class.

The three properties of AttributeUsageAttribute are set by defining the following parameters:

This positional parameter specifies the program elements that the indicated attribute can be placed on. The set of all possible elements that you can place an attribute on is listed in the AttributeTargets enumerator. You can combine several AttributeTargets values using a bitwise OR operation to get the desired combination of valid program elements.

This named parameter specifies whether the indicated attribute can be specified more than once for a given program element.

This named parameter specifies whether the indicated attribute can be inherited by derived classes and overriding members.

For more information about using attributes, see Attribute and Extending Metadata Using Attributes.


Namespace: System

Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family, .NET Compact Framework

Assembly: Mscorlib (in Mscorlib.dll)

See Also

AttributeUsageAttribute Members | System Namespace | Attribute | AttributeTargets | Extending Metadata Using Attributes