How do I use a C# collection in VB6

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I need to define a collection of objects in C# that I can also use in VB6. I need the VB6 app to populate the collection and the C# app will then read the collection and use the data.

I have succesfully used simple classes in this way but want to do the same thing with collections.

Posted 20-Mar-15 0:32am

Phil McT

Updated 25-May-16 12:41pm

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Sergey Alexandrovich Kryukov 20-Mar-15 8:06am

Forget VB6, this is the only non-nonsense thing you can do.
—SA

Phil McT 20-Mar-15 8:11am

I'm trying to believe me!

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Steve Luong · Answer 1 · 2016-05-25T12:41:00

I believe you can only use collection in vb.net instead of c#. C# has Collection, but you have to specify the type, for example Collection<yourclass>, and this structure cannot be used by VB6!
In vb.net, you can create a generic list with a property is Collection, then you can add any object to this collection and comsume it in VB6

VB.NET

Public Class GenericList
    Private _list As New Collection

    Public Property List() As Collection
        Get
            Return _list
        End Get
        Set(value As Collection)
            _list = value
        End Set
    End Property
End Class

Abhinav S · Answer 2 · 2015-03-20T00:41:00

Solution 1

This can be tried using interop - C# Com[^].

Posted 20-Mar-15 0:41am

Abhinav S

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Phil McT 20-Mar-15 6:53am

I've had a quick look but it doesn't look like that example deals specifically with collections, which is what I'm after. I can expose classes that use simple types like int, string, bool etc. But I want to use a collection and within VB add new items and enumerate it with For Each etc.

Dave Kreskowiak 25-May-16 19:05pm

You're going to have to wrap the collection in a class and use COM-exposed methods in that class to manage the collection which VB6 will be able to call. You're not going to be able to use a .NET collection class directly.