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CoClassAttribute Class

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

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

[ComVisibleAttribute(true)]
[AttributeUsageAttribute(AttributeTargets.Interface, Inherited = false)]
public sealed class CoClassAttribute : Attribute

You can apply this attribute to coclass interfaces, although the Type Library Importer (Tlbimp.exe) 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.InteropServices.ComImportAttribute and System.Runtime.InteropServices.GuidAttribute to the coclass interface. For additional information about how Tlbimp.exe imports interfaces and coclasses from a type library, see Imported Type Conversion.

System.Object
  System.Attribute
    System.Runtime.InteropServices.CoClassAttribute

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

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC

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

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 3.5, 2.0

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