Interoperating Using Generic Types
The COM model does not support the concept of generic types. Consequently, generic types cannot be used directly for COM interop.
Non-Supported Actions
The following actions are not supported and will fail with an E_NOINTERFACE error:
Accessing generic interfaces from COM.
Accessing class interfaces for nongeneric classes that derive from generic classes.
Generating class interfaces for generic classes. For example, the _MyGenericType interface cannot be generated for the MyGenericType<T> class.
Supported Actions
You can access a generic class indirectly using a nongeneric base interface. For example, consider the following type:
[C#]
class MyClass <T> : IMyClass, IEnumerable<int>
{
…
}
COM clients can make calls to instances of this type using the IMyClass interface, but calls to either _MyClass, _MyClass <T> or IEnumerable<T> will fail.
See Also
Reference
Generics (C# Programming Guide)