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enum System.Runtime.InteropServices.ClassInterfaceType

Assembly: System.Runtime.InteropServices

Identifies the type of class interface that is generated for a class.

Values

None

<para>Indicates that no class interface is generated for the class. If no interfaces are implemented explicitly, the class can only provide late-bound access through the <see langword="IDispatch" /> interface. This is the recommended setting for <see cref="T:System.Runtime.InteropServices.ClassInterfaceAttribute" />. Using <see langword="ClassInterfaceType.None" /> is the only way to expose functionality through interfaces implemented explicitly by the class.</para> <para>Tlbexp.exe (Type Library Exporter) exposes the first public, COM-visible interface implemented by the class as the default interface of the coclass. In .NET Framework 2.0 and later versions, you can specify the default interface exposed to COM by using the <see cref="T:System.Runtime.InteropServices.ComDefaultInterfaceAttribute" /> attribute. If the class implements no interfaces, the first public, COM-visible interface implemented by a base class becomes the default interface (starting with the most recently derived base class and working backward). Tlbexp.exe exposes <see langword="_Object" /> as the default interface if neither the class nor its base classes implement interfaces.</para>

AutoDispatch

<para>Indicates that the class only supports late binding for COM clients. A <see langword="dispinterface" /> for the class is automatically exposed to COM clients on request. The type library produced by Tlbexp.exe (Type Library Exporter) does not contain type information for the <see langword="dispinterface" /> in order to prevent clients from caching the DISPIDs of the interface. The <see langword="dispinterface" /> does not exhibit the versioning problems described in <see cref="T:System.Runtime.InteropServices.ClassInterfaceAttribute" /> because clients can only late-bind to the interface.</para> <para>This is the default setting for <see cref="T:System.Runtime.InteropServices.ClassInterfaceAttribute" />.</para>

AutoDual

Indicates that a dual class interface is automatically generated for the class and exposed to COM. Type information is produced for the class interface and published in the type library. Using <see langword="AutoDual" /> is strongly discouraged because of the versioning limitations described in <see cref="T:System.Runtime.InteropServices.ClassInterfaceAttribute" /> .