.NET Framework Class Library
CoClassAttribute Class

Specifies the class identifier of a coclass imported from a type library.

Inheritance Hierarchy
SystemObject
   SystemAttribute
    System.Runtime.InteropServicesCoClassAttribute

Namespace:   System.Runtime.InteropServices
Assembly:  mscorlib (in mscorlib.dll)
Syntax
<[%$TOPIC/6t5d4s69_en-us_VS_110_2_0_0_0_0%]([%$TOPIC/6t5d4s69_en-us_VS_110_2_0_0_0_1%].Interface, Inherited := False)> _
<[%$TOPIC/6t5d4s69_en-us_VS_110_2_0_0_0_2%](True)> _
Public NotInheritable Class CoClassAttribute _
	Inherits [%$TOPIC/6t5d4s69_en-us_VS_110_2_0_0_0_3%]
[[%$TOPIC/6t5d4s69_en-us_VS_110_2_0_1_0_0%]([%$TOPIC/6t5d4s69_en-us_VS_110_2_0_1_0_1%].Interface, Inherited = false)]
[[%$TOPIC/6t5d4s69_en-us_VS_110_2_0_1_0_2%](true)]
public sealed class CoClassAttribute : [%$TOPIC/6t5d4s69_en-us_VS_110_2_0_1_0_3%]
[[%$TOPIC/6t5d4s69_en-us_VS_110_2_0_2_0_0%]([%$TOPIC/6t5d4s69_en-us_VS_110_2_0_2_0_1%]::Interface, Inherited = false)]
[[%$TOPIC/6t5d4s69_en-us_VS_110_2_0_2_0_2%](true)]
public ref class CoClassAttribute sealed : public [%$TOPIC/6t5d4s69_en-us_VS_110_2_0_2_0_3%]
[<[%$TOPIC/6t5d4s69_en-us_VS_110_2_0_3_0_0%]>]
[<[%$TOPIC/6t5d4s69_en-us_VS_110_2_0_3_0_1%]([%$TOPIC/6t5d4s69_en-us_VS_110_2_0_3_0_2%].Interface, Inherited = false)>]
[<[%$TOPIC/6t5d4s69_en-us_VS_110_2_0_3_0_3%](true)>]
type CoClassAttribute =  
    class 
        inherit [%$TOPIC/6t5d4s69_en-us_VS_110_2_0_3_0_4%] 
    end
public final class CoClassAttribute extends [%$TOPIC/6t5d4s69_en-us_VS_110_2_0_4_0_0%]

The CoClassAttribute type exposes the following members.

Constructors
  NameDescription
Public method Supported by Portable Class Library CoClassAttributeInitializes new instance of the CoClassAttribute with the class identifier of the original coclass.
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Properties
  NameDescription
Public property Supported by Portable Class Library CoClassGets the class identifier of the original coclass.
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

You can apply this attribute to coclass interfaces, although the Tlbimp.exe (Type Library Importer) typically applies it for you when it imports a type library.

When Tlbimp.exe imports a coclass, it produces a managed class and an interface to represent the coclass. The coclass interface has the same interface identifier (IID) as the default interface of the original coclass. The imported coclass interface also retains the name of the coclass. Tlbimp.exe appends the original coclass name with "class" to identify the imported class.

You rarely apply this attribute. However, if plan to write source code that produces metadata that closely simulates metadata produced by Tlbimp.exe, you should create a coclass interface for each coclass. Use the name of the original coclass to name the coclass interface and derive it from the default interface. In addition to the CoClassAttribute, you must also apply the System.Runtime.InteropServicesComImportAttribute and System.Runtime.InteropServicesGuidAttribute to the coclass interface. For additional information about how Tlbimp.exe imports interfaces and coclasses from a type library, see Imported Type Conversion.

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

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.