AttributeUsageAttribute Class
 

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

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

Inheritance Hierarchy
SystemObject
   SystemAttribute
    SystemAttributeUsageAttribute

Syntax
[SerializableAttribute]
[AttributeUsageAttribute(AttributeTargets.Class, Inherited = true)]
[ComVisibleAttribute(true)]
public sealed class AttributeUsageAttribute : Attribute
[SerializableAttribute]
[AttributeUsageAttribute(AttributeTargets::Class, Inherited = true)]
[ComVisibleAttribute(true)]
public ref class AttributeUsageAttribute sealed : Attribute
[<Sealed>]
[<SerializableAttribute>]
[<AttributeUsageAttribute(AttributeTargets.Class, Inherited = true)>]
[<ComVisibleAttribute(true)>]
type AttributeUsageAttribute = 
    class
        inherit Attribute
    end
<SerializableAttribute>
<AttributeUsageAttribute(AttributeTargets.Class, Inherited := True)>
<ComVisibleAttribute(True)>
Public NotInheritable Class AttributeUsageAttribute
	Inherits Attribute
Constructors
NameDescription
System_CAPS_pubmethod AttributeUsageAttribute

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

Properties
NameDescription
System_CAPS_pubproperty

Gets or sets a Boolean value indicating whether more than one instance of the indicated attribute can be specified for a single program element.

System_CAPS_pubproperty

Gets or sets a Boolean value indicating whether the indicated attribute can be inherited by derived classes and overriding members.

System_CAPS_pubproperty

When implemented in a derived class, gets a unique identifier for this Attribute.(Inherited from Attribute.)

System_CAPS_pubproperty

Gets a set of values identifying which program elements that the indicated attribute can be applied to.

Methods
NameDescription
System_CAPS_pubmethod Equals

This API supports the product infrastructure and is not intended to be used directly from your code. Returns a value that indicates whether this instance is equal to a specified object.(Inherited from Attribute.)

System_CAPS_pubmethod GetHashCode

Returns the hash code for this instance.(Inherited from Attribute.)

System_CAPS_pubmethod GetType

Gets the Type of the current instance.(Inherited from Object.)

System_CAPS_pubmethod IsDefaultAttribute

When overridden in a derived class, indicates whether the value of this instance is the default value for the derived class.(Inherited from Attribute.)

System_CAPS_pubmethod Match

When overridden in a derived class, returns a value that indicates whether this instance equals a specified object.(Inherited from Attribute.)

System_CAPS_pubmethod ToString

Returns a string that represents the current object.(Inherited from Object.)

Explicit Interface Implementations
NameDescription
System_CAPS_pubinterface System_CAPS_privmethod _AttributeGetIDsOfNames

Maps a set of names to a corresponding set of dispatch identifiers.(Inherited from Attribute.)

System_CAPS_pubinterface System_CAPS_privmethod _AttributeGetTypeInfo

Retrieves the type information for an object, which can be used to get the type information for an interface.(Inherited from Attribute.)

System_CAPS_pubinterface System_CAPS_privmethod _AttributeGetTypeInfoCount

Retrieves the number of type information interfaces that an object provides (either 0 or 1).(Inherited from Attribute.)

System_CAPS_pubinterface System_CAPS_privmethod _AttributeInvoke

Provides access to properties and methods exposed by an object.(Inherited from Attribute.)

Remarks

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 enumeration. 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.

Version Information
Universal Windows Platform
Available since 4.5
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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.

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