Use .NET in VB6 or classical ASP

Question

Duplicate of Calling .NET methods from VB6 via COM visible DLL

Which ways exist to use/call .NET classes/functions/libraries (.net 3.x) in VB6 or classical ASP ? Has anybody experiences with that ? How much effort is necessary to wrap .NET to COM ? Are there tools which help ?

Answer 1

Yes it is possible. .Net has functionality for generating a COM wrapper.

This is covered in this question: http://stackoverflow.com/questions/233284/calling-net-methods-from-vb6-via-com-visible-dll

• Call .net classes from VB6 is done using a COM wrapper. This is the same in 2.0 as in 3.5. However, it is supposed to be much improved in 4.0.
• The effort is the same as working with COM in general
• In visual studio there is a setting "COM visible", if you check this VS will do a lot of the work generating the wrapper

Answer 2

You might want to read this article:

http://www.codeproject.com/KB/COM/cominterop.aspx

Answer 3

You can make .NET assemblies expose COM, therefore you can access the classes by any technology/programming language which has COM support. See this link for example.

Answer 4

It's pretty easy actually and I have created .NET components called from both VB6 COM dlls and Classic ASP. You essentially need to create a COM callable wrapper thats exposes the .NET component to a COM client. This article will get you started

Calling a .NET component from a COM component

A couple of pointers

• Any COM callable types will need a public parameterless constructor
• Mark public any methods, properties or events that you want to expose to COM.
• It's a good idea to explicitly implement an interface as opposed to relying on one to be generated from your class for you.

Answer 5

I would recommend the following reading: http://www.sdltridionworld.com/articles/vs2005_to_com_and_dotNET_1.aspx