.NET Framework Class Library
TypeIdentifierAttribute Class

Provides support for type equivalence.

Inheritance Hierarchy
SystemObject
   SystemAttribute
    System.Runtime.InteropServicesTypeIdentifierAttribute

Namespace:   System.Runtime.InteropServices
Assembly:  mscorlib (in mscorlib.dll)
Syntax
<[%$TOPIC/dd269629_en-us_VS_110_2_0_0_0_0%]([%$TOPIC/dd269629_en-us_VS_110_2_0_0_0_1%].Struct Or [%$TOPIC/dd269629_en-us_VS_110_2_0_0_0_2%].Enum Or [%$TOPIC/dd269629_en-us_VS_110_2_0_0_0_3%].Interface Or [%$TOPIC/dd269629_en-us_VS_110_2_0_0_0_4%].Delegate, AllowMultiple := False,  _
	Inherited := False)> _
<[%$TOPIC/dd269629_en-us_VS_110_2_0_0_0_5%](False)> _
Public NotInheritable Class TypeIdentifierAttribute _
	Inherits [%$TOPIC/dd269629_en-us_VS_110_2_0_0_0_6%]
[[%$TOPIC/dd269629_en-us_VS_110_2_0_1_0_0%]([%$TOPIC/dd269629_en-us_VS_110_2_0_1_0_1%].Struct|[%$TOPIC/dd269629_en-us_VS_110_2_0_1_0_2%].Enum|[%$TOPIC/dd269629_en-us_VS_110_2_0_1_0_3%].Interface|[%$TOPIC/dd269629_en-us_VS_110_2_0_1_0_4%].Delegate, AllowMultiple = false, 
	Inherited = false)]
[[%$TOPIC/dd269629_en-us_VS_110_2_0_1_0_5%](false)]
public sealed class TypeIdentifierAttribute : [%$TOPIC/dd269629_en-us_VS_110_2_0_1_0_6%]
[[%$TOPIC/dd269629_en-us_VS_110_2_0_2_0_0%]([%$TOPIC/dd269629_en-us_VS_110_2_0_2_0_1%]::Struct|[%$TOPIC/dd269629_en-us_VS_110_2_0_2_0_2%]::Enum|[%$TOPIC/dd269629_en-us_VS_110_2_0_2_0_3%]::Interface|[%$TOPIC/dd269629_en-us_VS_110_2_0_2_0_4%]::Delegate, AllowMultiple = false, 
	Inherited = false)]
[[%$TOPIC/dd269629_en-us_VS_110_2_0_2_0_5%](false)]
public ref class TypeIdentifierAttribute sealed : public [%$TOPIC/dd269629_en-us_VS_110_2_0_2_0_6%]
[<[%$TOPIC/dd269629_en-us_VS_110_2_0_3_0_0%]>]
[<[%$TOPIC/dd269629_en-us_VS_110_2_0_3_0_1%]([%$TOPIC/dd269629_en-us_VS_110_2_0_3_0_2%].Struct|[%$TOPIC/dd269629_en-us_VS_110_2_0_3_0_3%].Enum|[%$TOPIC/dd269629_en-us_VS_110_2_0_3_0_4%].Interface|[%$TOPIC/dd269629_en-us_VS_110_2_0_3_0_5%].Delegate, AllowMultiple = false, 
    Inherited = false)>]
[<[%$TOPIC/dd269629_en-us_VS_110_2_0_3_0_6%](false)>]
type TypeIdentifierAttribute =  
    class 
        inherit [%$TOPIC/dd269629_en-us_VS_110_2_0_3_0_7%] 
    end
public final class TypeIdentifierAttribute extends [%$TOPIC/dd269629_en-us_VS_110_2_0_4_0_0%]

The TypeIdentifierAttribute type exposes the following members.

Constructors
  NameDescription
Public method Supported by Portable Class Library TypeIdentifierAttributeCreates a new instance of the TypeIdentifierAttribute class.
Public method Supported by Portable Class Library TypeIdentifierAttribute(String, String)Creates a new instance of the TypeIdentifierAttribute class with the specified scope and identifier.
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Properties
  NameDescription
Public property Supported by Portable Class Library IdentifierGets the value of the identifier parameter that was passed to the TypeIdentifierAttribute(String, String) constructor.
Public property Supported by Portable Class Library ScopeGets the value of the scope parameter that was passed to the TypeIdentifierAttribute(String, String) constructor.
Public property TypeIdWhen implemented in a derived class, gets a unique identifier for this Attribute. (Inherited from Attribute.)
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Methods
  NameDescription
Public method 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 Portable Class Library GetHashCodeReturns the hash code for this instance. (Inherited from Attribute.)
Public method 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 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 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

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 TypeIsEquivalentTo topic.

Version Information

.NET Framework

Supported in: 4.6, 4.5, 4

.NET Framework Client Profile

Supported in: 4

Portable Class Library

Supported in: Portable Class Library

Supported in: Windows Phone 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.