Problem with Type Library exporter: Warning: Non COM visible value type

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A first question post from a novice programmer... any help appreciated:

I have developed a com visible UserControl in VB.NET (VS2010). It works fine but when built it gives me a series of warnings similar to:

Type library exporter warning processing ..... Warning: Non COM visible value type 'System.Windows.Forms.AutoSizeMode' is being referenced either from the type currently being exported or from one of its base types.

I have Imports System.Windows.Forms and my UserControl makes use of several controls such as Label, RTB etc.

Done lots of web searching on this but not finding a solution I can make sense of!

Any pointers please?

Regards
Kevin

Posted 25-Jan-12 0:28am

kmf

Updated 25-Jan-12 22:14pm

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Lakamraju Raghuram 26-Jan-12 9:28am

Is the assembly and all other required types are set as COM visible

kmf 26-Jan-12 10:51am

Thanks Lakamraju, I have selected 'Register for COM Interop' and 'Make assembly COM visible' in my project properties. I am not sure if that is enough though. I am testing with just one class, a UserControl, in the project and defined as:
<ProgId("myProgName"), ClassInterface(ClassInterfaceType.AutoDual), Guid("2******guid_here")> _
Public Class myClassName

kmf 27-Jan-12 10:32am

It appears I only get these warninging with ClassInterfaceType set to AutoDual. If I use either AutoDispatch or None there are no warnings. I am learning a bit about the differences now. AutoDual is 'strongly discouraged'! ... http://msdn.microsoft.com/en-us/library/system.runtime.interopservices.classinterfacetype.aspx

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Dave Kreskowiak · Answer 1 · 2012-01-26T04:13:00

Solution 1

Have you gone into your project properties, Compile tab, and checked "Register for COM interop"??