Using VB interfaces, enums, etc in C# code

Question

I have a solution with multiple projects, some of the projects are written in VB, some in C#. I am wondering if there's a way to use interfaces and/or enums written in VB in C# classes? My C# code below doesn't compile, however I am able to see the interface in intellisense.

VB Code:

Namespace A
    Public Inteface IHandler
        Function Handle() As HandlerResult
    End Interface

    Public Enum HandlerResult
        Success = 1
        Fail = 0
    End Enum
End Namespace

C# Code:

using A;
namespace B
{
    public class MyHandler : IHandler
    {
        public HandlerResult Handle(){
            return HandlerResult.Success;
        }
    }
}

P.S It's a console/service application, not ASP.Net (where I know it's doable).

UPD: Sorry guys, was missing a reference to the project with the interface. It's fixed now. I think the thing that in VB projects references are done slightly different than in C# confused me.

@ChrisDunaway, I meant UI for references in visual studio: C# projects have a folder called 'References' with all the referenced libraries, when in VB all the references are done 'behind', in project properties. — Maksim Vi.
– Maksim Vi., Commented Oct 21, 2011 at 19:16

Paul Keister · Accepted Answer · 2011-10-20 23:47:46Z

3

This will work if you put the C# code in a different assembly than the VB code. In order to avoid circular dependencies, you may have to move all of your existing VB code into a DLL assembly. That way you can reference the VB.Net assembly from your new C# assembly, and reference both assemblies from the main exe assembly.

Note that if you do this the namespace when viewed from C# will not be simply "A", it will be nested below the default namespace of the VBProject, e.g.

using StackOverflow7843509.A;

namespace B
{
    public class MyHandler : IHandler
    {
        public HandlerResult Handle()
        {
            return HandlerResult.Success;
        }
    }
}

In this example, the default namespace of the VB project I created was StackOverflow7843509

edited Oct 20, 2011 at 23:47

answered Oct 20, 2011 at 23:36

Paul Keister

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1 Comment

Maksim Vi. Over a year ago

It's a different assembly, I added a reference to the right project with the interface and it worked, my bad. Thanks.

James Johnson · Accepted Answer · 2011-10-20 23:38:36Z

0

It all comes down to the same thing when the code is compiled, so the answer is (mostly) yes - you can use compiled VB.NET libraries with C# and vice-versa.

answered Oct 20, 2011 at 23:38

James Johnson

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