System.Runtime.InteropServices.ComEventInterfaceAttribute Class

Identifies the source interface and the class that implements the methods of the event interface that is generated when a coclass is imported from a COM type library.

See Also: ComEventInterfaceAttribute Members


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


You can apply this attribute to interfaces, although the [<topic://cpgrfTypeLibraryImporterTlbimpexe>] typically applies it for you when it imports a type library.

When a source interface is imported from a type library, any methods it implements are added as events to a generated event interface. Tlbimp.exe applies System.Runtime.InteropServices.ComEventInterfaceAttribute to the event interface to identify the managed class that implements the methods of the event interface and implements the original source interface. The common language runtime uses this attribute at run time to perform the following tasks:

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 event interface for each original source interface. For a detailed description about how Tlbimp.exe imports events, see [<topic://cpcontlbimpmemberconversion>]. For instruction about how to expose a COM event to a.NET client, see [<topic://cpconhandlingeventsraisedbycomsource>].


Namespace: System.Runtime.InteropServices
Assembly: mscorlib (in mscorlib.dll)
Assembly Versions: 1.0.5000.0,,