.NET Framework Class Library
AttributeUsageAttribute Class

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

Inheritance Hierarchy
SystemObject
   SystemAttribute
    SystemAttributeUsageAttribute

Namespace:   System
Assembly:  mscorlib (in mscorlib.dll)
Syntax
<[%$TOPIC/4kc2f9bs_en-us_VS_110_2_0_0_0_0%]> _
<AttributeUsageAttribute([%$TOPIC/4kc2f9bs_en-us_VS_110_2_0_0_0_1%].Class, Inherited := True)> _
<[%$TOPIC/4kc2f9bs_en-us_VS_110_2_0_0_0_2%](True)> _
Public NotInheritable Class AttributeUsageAttribute _
	Inherits [%$TOPIC/4kc2f9bs_en-us_VS_110_2_0_0_0_3%]
[[%$TOPIC/4kc2f9bs_en-us_VS_110_2_0_1_0_0%]]
[AttributeUsageAttribute([%$TOPIC/4kc2f9bs_en-us_VS_110_2_0_1_0_1%].Class, Inherited = true)]
[[%$TOPIC/4kc2f9bs_en-us_VS_110_2_0_1_0_2%](true)]
public sealed class AttributeUsageAttribute : [%$TOPIC/4kc2f9bs_en-us_VS_110_2_0_1_0_3%]
[[%$TOPIC/4kc2f9bs_en-us_VS_110_2_0_2_0_0%]]
[AttributeUsageAttribute([%$TOPIC/4kc2f9bs_en-us_VS_110_2_0_2_0_1%]::Class, Inherited = true)]
[[%$TOPIC/4kc2f9bs_en-us_VS_110_2_0_2_0_2%](true)]
public ref class AttributeUsageAttribute sealed : public [%$TOPIC/4kc2f9bs_en-us_VS_110_2_0_2_0_3%]
[<[%$TOPIC/4kc2f9bs_en-us_VS_110_2_0_3_0_0%]>]
[<[%$TOPIC/4kc2f9bs_en-us_VS_110_2_0_3_0_1%]>]
[<AttributeUsageAttribute([%$TOPIC/4kc2f9bs_en-us_VS_110_2_0_3_0_2%].Class, Inherited = true)>]
[<[%$TOPIC/4kc2f9bs_en-us_VS_110_2_0_3_0_3%](true)>]
type AttributeUsageAttribute =  
    class 
        inherit [%$TOPIC/4kc2f9bs_en-us_VS_110_2_0_3_0_4%] 
    end
public final class AttributeUsageAttribute extends [%$TOPIC/4kc2f9bs_en-us_VS_110_2_0_4_0_0%]

The AttributeUsageAttribute type exposes the following members.

Constructors
  NameDescription
Public method Supported by the XNA Framework Supported by Portable Class Library AttributeUsageAttributeInitializes a new instance of the AttributeUsageAttribute class with the specified list of AttributeTargets, the AllowMultiple value, and the Inherited value.
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Properties
  NameDescription
Public property Supported by the XNA Framework Supported by Portable Class Library AllowMultipleGets or sets a Boolean value indicating whether more than one instance of the indicated attribute can be specified for a single program element.
Public property Supported by the XNA Framework Supported by Portable Class Library InheritedGets or sets a Boolean value indicating whether the indicated attribute can be inherited by derived classes and overriding members.
Public property TypeIdWhen implemented in a derived class, gets a unique identifier for this Attribute. (Inherited from Attribute.)
Public property Supported by the XNA Framework Supported by Portable Class Library ValidOnGets a set of values identifying which program elements that the indicated attribute can be applied to.
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Methods
  NameDescription
Public method Supported by the XNA Framework Supported by Portable Class Library EqualsInfrastructure. Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute.)
Public method Supported by the XNA Framework Supported by Portable Class Library GetHashCodeReturns the hash code for this instance. (Inherited from Attribute.)
Public method Supported by the XNA Framework Supported by Portable Class Library GetTypeGets the Type of the current instance. (Inherited from Object.)
Public method IsDefaultAttributeWhen overridden in a derived class, indicates whether the value of this instance is the default value for the derived class. (Inherited from Attribute.)
Public method Supported by the XNA Framework MatchWhen overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute.)
Public method Supported by the XNA Framework Supported by Portable Class Library ToStringReturns a string that represents the current object. (Inherited from Object.)
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Explicit Interface Implementations
  NameDescription
Explicit interface implemetation Private method _AttributeGetIDsOfNamesMaps a set of names to a corresponding set of dispatch identifiers. (Inherited from Attribute.)
Explicit interface implemetation Private method _AttributeGetTypeInfoRetrieves the type information for an object, which can be used to get the type information for an interface. (Inherited from Attribute.)
Explicit interface implemetation Private method _AttributeGetTypeInfoCountRetrieves the number of type information interfaces that an object provides (either 0 or 1). (Inherited from Attribute.)
Explicit interface implemetation Private method _AttributeInvokeProvides access to properties and methods exposed by an object. (Inherited from Attribute.)
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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

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0

Portable Class Library

Supported in: Portable Class Library

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8
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.