CoClassAttribute Class

Definition

Namespace:

System.Runtime.InteropServices

Assembly:

System.Runtime.InteropServices.dll

Source:

CoClassAttribute.cs

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

public ref class CoClassAttribute sealed : Attribute

[System.AttributeUsage(System.AttributeTargets.Interface, Inherited=false)]
public sealed class CoClassAttribute : Attribute

[<System.AttributeUsage(System.AttributeTargets.Interface, Inherited=false)>]
type CoClassAttribute = class
    inherit Attribute

Public NotInheritable Class CoClassAttribute
Inherits Attribute

Inheritance

Object

Attribute

CoClassAttribute

Attributes

AttributeUsageAttribute

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 you 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.InteropServices.ComImportAttribute and System.Runtime.InteropServices.GuidAttribute attributes to the coclass interface. For additional information about how Tlbimp.exe imports interfaces and coclasses from a type library, see Imported Type Conversion.

Constructors

CoClassAttribute(Type)

Initializes new instance of the CoClassAttribute with the class identifier of the original coclass.

Properties

CoClass	Gets the class identifier of the original coclass.
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

• ComImportAttribute
• GuidAttribute
• Tlbimp.exe (Type Library Importer)