Register COM type for Dependency Injection

Question

I am currently working on a Visual Studio Extension, however I am pretty sure this should apply to all kind of applications.

I have a SimpleInjector Container, in which I want register an IVsSolution (COM Object). Note that it is marked by the following attributes:

[ComImport]
[Guid("7F7CD0DB-91EF-49DC-9FA9-02D128515DD4")]
[ComConversionLoss]
[InterfaceType(1)]

Anyhow when I try to following code:

var container = new Container();

container.RegisterInstance(IVsSolutionInstance);

It throws the following error:

The supplied type __ComObject does not implement IVsSolution. Parameter name: serviceType.

I would also guess, that this would apply for all COMImport types. Anyhow how could I register a COM Type in preferable a SimpleInjector container?

Answer 1

This is a known limitation in Simple Injector v4, which has been fixed in v5.

To work around this problem, create a wrapper implementation of IVsSolution that wraps the __ComObject and forwards calls to that.