C# collection to Classic ASP

Question

I am having trouble exposing a C# collection to Classic ASP. I've tried to use IEnumerable and Array. but I get the "object not a collection" error.

my method looks like:

public IEnumerable<MyObj> GetMyObj() { ... }

and on the Classic ASP side:

Dim obj, x 
Set obj = Server.CreateObject("Namespace.class")

For Each x in obj.GetMyObj
...

So how can I pass a collection to Classic ASP?

UPDATE:

may be this is a progress, the solution I found was to use a new class that inherits IEnumerable instead of using IEnumerable<MyObj>:

public class MyEnumerable : IEnumerable
{
   private IEnumerable<MyObj> _myObj;

   .
   .
   .

    [DispId(-4)]
    public IEnumerator GetEnumerator()
    {
      _myObj.GetEnumerator();
    }
}

But now when I try to access a property of MyObj I get an error: Object required.

Any idea?

Answer 1

I think you found the answer; Classic ASP with VB does not have generics built into it. So, you try to pass an IEnumerable<MyObj> to ASP and it comes out as a nightmarish mashup name which classic ASP has no clue how to work with.

The solution is to pass a non-generic IEnumerable. The problem then is that the sequence is treated as containing basic Object instances. You must revert to the pre-2.0 methods of casting objects you get out of a list. In VB this isn't difficult; just explicitly specify the element type and VB will implicitly cast for you while iterating through the For Each:

Dim obj, x 
Set obj = Server.CreateObject("Namespace.class")

For Each x As MyObj in obj.GetMyObj //casts each element in turn
   ...