TypeIdentifierAttribute Class

Definition

Namespace:

System.Runtime.InteropServices

Assembly:

System.Runtime.InteropServices.dll

Source:

TypeIdentifierAttribute.cs

Provides support for type equivalence.

public ref class TypeIdentifierAttribute sealed : Attribute

[System.AttributeUsage(System.AttributeTargets.Delegate | System.AttributeTargets.Enum | System.AttributeTargets.Interface | System.AttributeTargets.Struct, AllowMultiple=false, Inherited=false)]
public sealed class TypeIdentifierAttribute : Attribute

[<System.AttributeUsage(System.AttributeTargets.Delegate | System.AttributeTargets.Enum | System.AttributeTargets.Interface | System.AttributeTargets.Struct, AllowMultiple=false, Inherited=false)>]
type TypeIdentifierAttribute = class
    inherit Attribute

Public NotInheritable Class TypeIdentifierAttribute
Inherits Attribute

Inheritance

Object

Attribute

TypeIdentifierAttribute

Attributes

AttributeUsageAttribute

Remarks

The TypeIdentifierAttribute attribute is primarily emitted by compilers. It serves two purposes:

• For all imported types, it indicates that the type is intended to be used for type equivalence.

• For types that don't have GUIDs in their type library, it has a constructor that takes two strings (scope and identifier). These are combined into a GUID and become the key that is used for type equivalence.

Type equivalence is discussed in the Type.IsEquivalentTo topic.

Constructors

TypeIdentifierAttribute()	Creates a new instance of the TypeIdentifierAttribute class.
TypeIdentifierAttribute(String, String)	Creates a new instance of the TypeIdentifierAttribute class with the specified scope and identifier.

Properties

Identifier	Gets the value of the identifier parameter that was passed to the TypeIdentifierAttribute(String, String) constructor.
Scope	Gets the value of the scope parameter that was passed to the TypeIdentifierAttribute(String, String) constructor.
TypeId	When implemented in a derived class, gets a unique identifier for this Attribute. (Inherited from Attribute)

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)

See also

• Extending Metadata Using Attributes