AttributeUsageAttribute Class

Reference

Definition

Namespace:: System

Assembly:: System.Runtime.dll

Assembly:: mscorlib.dll

Assembly:: netstandard.dll

Source:: AttributeUsageAttribute.cs

Source:: AttributeUsageAttribute.cs

Source:: AttributeUsageAttribute.cs

Important

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

public ref class AttributeUsageAttribute sealed : Attribute

[System.AttributeUsage(System.AttributeTargets.Class, Inherited=true)]
public sealed class AttributeUsageAttribute : Attribute

[System.AttributeUsage(System.AttributeTargets.Class, Inherited=true)]
[System.Serializable]
public sealed class AttributeUsageAttribute : Attribute

[System.AttributeUsage(System.AttributeTargets.Class, Inherited=true)]
[System.Serializable]
[System.Runtime.InteropServices.ComVisible(true)]
public sealed class AttributeUsageAttribute : Attribute

[<System.AttributeUsage(System.AttributeTargets.Class, Inherited=true)>]
type AttributeUsageAttribute = class
    inherit Attribute

[<System.AttributeUsage(System.AttributeTargets.Class, Inherited=true)>]
[<System.Serializable>]
type AttributeUsageAttribute = class
    inherit Attribute

[<System.AttributeUsage(System.AttributeTargets.Class, Inherited=true)>]
[<System.Serializable>]
[<System.Runtime.InteropServices.ComVisible(true)>]
type AttributeUsageAttribute = class
    inherit Attribute

Public NotInheritable Class AttributeUsageAttribute
Inherits Attribute

Inheritance: Object

Attribute
AttributeUsageAttribute

Attributes: AttributeUsageAttribute SerializableAttribute ComVisibleAttribute

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:

ValidOn

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.

AllowMultiple

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

Inherited

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 Attributes.

Constructors

AttributeUsageAttribute(AttributeTargets)

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

Properties

AllowMultiple	Gets or sets a Boolean value indicating whether more than one instance of the indicated attribute can be specified for a single program element.
Inherited	Gets or sets a Boolean value that determines whether the indicated attribute is inherited by derived classes and overriding members.
TypeId	When implemented in a derived class, gets a unique identifier for this Attribute. (Inherited from Attribute)
ValidOn	Gets a set of values identifying which program elements that the indicated attribute can be applied to.

Methods

Equals(Object)	Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute)
GetHashCode()	Returns the hash code for this instance. (Inherited from Attribute)
GetType()	Gets the Type of the current instance. (Inherited from Object)
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)
Match(Object)	When overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute)
MemberwiseClone()	Creates a shallow copy of the current Object. (Inherited from Object)
ToString()	Returns a string that represents the current object. (Inherited from Object)

Explicit Interface Implementations

_Attribute.GetIDsOfNames(Guid, IntPtr, UInt32, UInt32, IntPtr)	Maps a set of names to a corresponding set of dispatch identifiers. (Inherited from Attribute)
_Attribute.GetTypeInfo(UInt32, UInt32, IntPtr)	Retrieves the type information for an object, which can be used to get the type information for an interface. (Inherited from Attribute)
_Attribute.GetTypeInfoCount(UInt32)	Retrieves the number of type information interfaces that an object provides (either 0 or 1). (Inherited from Attribute)
_Attribute.Invoke(UInt32, Guid, UInt32, Int16, IntPtr, IntPtr, IntPtr, IntPtr)	Provides access to properties and methods exposed by an object. (Inherited from Attribute)

Applies to

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