Export (0) Print
Expand All

TypeIdentifierAttribute Class

Provides support for type equivalence.

System.Object
  System.Attribute
    System.Runtime.InteropServices.TypeIdentifierAttribute

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

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

The TypeIdentifierAttribute type exposes the following members.

  NameDescription
Public methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsTypeIdentifierAttribute()Creates a new instance of the TypeIdentifierAttribute class.
Public methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsTypeIdentifierAttribute(String, String)Creates a new instance of the TypeIdentifierAttribute class with the specified scope and identifier.
Top

  NameDescription
Public propertySupported by Portable Class LibrarySupported in .NET for Windows Store appsIdentifierGets the value of the identifier parameter that was passed to the TypeIdentifierAttribute(String, String) constructor.
Public propertySupported by Portable Class LibrarySupported in .NET for Windows Store appsScopeGets the value of the scope parameter that was passed to the TypeIdentifierAttribute(String, String) constructor.
Public propertyTypeIdWhen implemented in a derived class, gets a unique identifier for this Attribute. (Inherited from Attribute.)
Top

  NameDescription
Public methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsEqualsInfrastructure. Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute.)
Public methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsGetHashCodeReturns the hash code for this instance. (Inherited from Attribute.)
Public methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodIsDefaultAttributeWhen overridden in a derived class, indicates whether the value of this instance is the default value for the derived class. (Inherited from Attribute.)
Public methodMatchWhen overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute.)
Public methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsToStringReturns a string that represents the current object. (Inherited from Object.)
Top

  NameDescription
Explicit interface implemetationPrivate method_Attribute.GetIDsOfNamesMaps a set of names to a corresponding set of dispatch identifiers. (Inherited from Attribute.)
Explicit interface implemetationPrivate method_Attribute.GetTypeInfoRetrieves the type information for an object, which can be used to get the type information for an interface. (Inherited from Attribute.)
Explicit interface implemetationPrivate method_Attribute.GetTypeInfoCountRetrieves the number of type information interfaces that an object provides (either 0 or 1). (Inherited from Attribute.)
Explicit interface implemetationPrivate method_Attribute.InvokeProvides access to properties and methods exposed by an object. (Inherited from Attribute.)
Top

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.

.NET Framework

Supported in: 4.6, 4.5, 4

.NET Framework Client Profile

Supported in: 4

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

Supported in: Windows Phone 8.1

Windows Phone 8.1, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
Show:
© 2014 Microsoft