Passing strongly typed arguments in .NET COM interop

Question

I have two .NET classes exposed via COM interop - let\'s say Foo and Bar, and I need to pass an argument of type Foo to a method defined in Bar. Something like this:

Answer 1

After struggling with this same issue for a while, I found that is was having issues with passing argments by reference instead of by value. See here:

http://msdn.microsoft.com/en-us/library/ee478101.aspx

So I just added round brackets to the passed argument in VB Script, and it seemed to have solved the problem. So in your example, just doing this:

Set foo = CreateObject("TestCSProject.Foo")
Set bar = CreateObject("TestCSProject.Bar")
Call bar.Method((foo))

Should work as expected, without having to set the ClassInterface attribute, and without using Interfaces.