NonComVisibleBaseClass was detected

[Silvio]

Hi!

Some tests seem to fail in debug mode. Following message is shown:

NonComVisibleBaseClass was detected
Message: A QueryInterface call was made requesting the class interface of COM visible managed class 'MS.Internal.AutomationProxies.WindowsEditBox'. However since this class derives from non COM visible class 'MS.Internal.AutomationProxies.ProxyHwnd', the QueryInterface call will fail. This is done to prevent the non COM visible base class from being constrained by the COM versioning rules.

I don´t see any connection between the failing tests. The only constant is this message shown in debug mode.
Does somebody know this issue?

Kind regards

[Boyan Boev]

Hello Silvio,

It seems that is a question related rather to Visual Studio than to Test Studio.

An option here is to turn off the managed Debugging Assistant for the "NonComVisibleBaseClass" exception in Visual Studio:

1. Navigate to Debug->Exceptions.
2. Expand "Managed Debugging Assistants"
3. Uncheck the NonComVisibleBaseClass Thrown option.
4. Click "OK"

I recorded a short video as a demonstration.

Let me know if this helps.

Greetings,
Boyan Boev
the Telerik team

[Silvio]

Thanks for your help!

This would surely be a solution / workaround. I could also just run it in release mode. It´s no big problem, but I just wanted to let you know.

Kind regards
Silvio