Setting the attribute to false on a type prevents that type from being exported to a type library classes are not registered interfaces are never responsive to unmanaged QueryInterface calls. However, you cannot make members of a type visible if the type is invisible. Setting the attribute to false on a specific type hides that type and its members. You can selectively make types within the assembly visible by setting the individual types to true. Setting the attribute to false on the assembly hides all public types within the assembly. The attribute cannot be used to make an otherwise internal or protected type visible to COM or to make members of a nonvisible type visible. This attribute is not needed to make public managed assemblies and types visible they are visible to COM by default. The default is true, which indicates that the managed type is visible to COM. You can apply this attribute to assemblies, interfaces, classes, structures, delegates, enumerations, fields, methods, or properties. Public ReadOnly Property MyProperty() As Integer Public Function MyOtherMethod() As Boolean Public Function MyMethod(param As String) As Integer using namespace System::Runtime::InteropServices By setting ComVisibleAttribute to false on M圜lass( SampleClass in the Visual Basic example), and false on MyMethod and MyProperty, you can avoid inadvertently exposing the members to COM through inheritance. The following example shows how you can control the visibility to COM of a class so that its members are invisible. Inherit Attribute Public NotInheritable Class ComVisibleAttributeĪttributeUsageAttribute ComVisibleAttribute Examples Public sealed class ComVisibleAttribute : Attribute public ref class ComVisibleAttribute sealed : Attribute Controls accessibility of an individual managed type or member, or of all types within an assembly, to COM.
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