How can I tell if a DLL is ComVisible?

Question

I have a DLL that may or may not have its ComVisible attribute set to true. I'm not sure how it was built, or with what attributes? All I know is that it's a .Net DLL. Simply put, how can I tell if it is Com Visible?

Sorry if this is a duplicate. All of my searches about this return results that show how to make a DLL ComVisible. I know how to do that.

Just run Tlbexp.exe. It will complain when it doesn't find any types that are [ComVisible]. — Hans Passant, Apr 04 '13 at 21:30

score 3 · Accepted Answer · answered Apr 04 '13 at 20:44

You could check the ComVisibleAttribute of the assembly using reflection:

private static bool IsComVisible(string assemblyPath)
{
  var assembly = Assembly.LoadFile(assemblyPath);

  var attributes = assembly.GetCustomAttributes(typeof(ComVisibleAttribute), false);

  if (attributes.Length > 0)
  {
    return ((ComVisibleAttribute)attributes[0]).Value;
  }

  return false;
}

score 0 · Answer 2 · answered Apr 04 '13 at 20:44

0

Something like this?

Assembly asm = Assembly.GetExecutingAssembly(); //Assembly.LoadFile, Assembly.Load

bool comVisible = asm.GetCustomAttributes()
                     .OfType<ComVisibleAttribute>()
                     .First()
                     .Value;

answered Apr 04 '13 at 20:44

I4V

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Got an error: `No overload for method 'GetCustomAttributes' takes 0 arguments` – user2023861 Apr 05 '13 at 13:02

How can I tell if a DLL is ComVisible?

2 Answers2