Share C# class and static variables in VB.NET insde the same solution

Question

I want to share code from a C# project inside a VB.Net project. I want to refer a public class and its variables inside VB. So I've put both VB and C# project inside the same solution. Here is the declaration of C# class insde C# project:

public class MyUtils
{

    public static byte[] zeroArray = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
    ....

When I want to refer it inside VB I will have below errors: 'MyUtils' is not accessible in this context because it is 'Friend'.

I have change the accessibility of every object to public in C# but I don't know how to allow access to C# class. I should add that I have not enough familiarity with VB and its inheritance mechanisms.

Not familiar with VB.net but am aware that c#/vb can share code a quick google showed this — AliK
– AliK, Commented May 1, 2021 at 8:33
It is possibly to have a solution with C# and VB projects. I have worked with an example, but cannot access it anymore — Hans Keﬆing
– Hans Keﬆing, Commented May 1, 2021 at 9:20
Friend in vb.net is the same as internal in C#. So the snippet you posted does not match the error message at all. The C# assembly you actually used did not yet have public in the class definition. Do make sure that the vb.net and C# projects belong to the same solution and that the vb.net project uses a project reference instead of a file reference to avoid such mishaps. — Hans Passant
– Hans Passant, Commented May 1, 2021 at 12:42
@HansPassant I don't know why it happened. My C# project was change to a class Library and I referenced it in VB.NET project. But the error was as above. When I changed the VB.NET project to reference dll file of C# project it work without any problems! — VSB
– VSB, Commented May 2, 2021 at 5:52

Andrew Morton · Accepted Answer · 2021-05-01 11:16:09Z

1

I created a C# console app named "ConsoleApp2" using .NET Framework 4.8 and added a class named "MyUtils":

namespace ConsoleApp2
{
    public class MyUtils
    {
        public static byte[] zeroArray = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };

    }
}

I built the project to make sure that worked.

Then I added a VB.NET console app project named "ConsoleApp1" to the same solution. I added a reference to the ConsoleApp2 project:

and used this code:

Module Module1

    Sub Main()
        Dim bb = ConsoleApp2.MyUtils.zeroArray
        Console.WriteLine(String.Join(" ", bb.Select(Function(b) b.ToString("X2"))))
        Console.ReadLine()

    End Sub

End Module

and ran it to get the output:

00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

edited May 1, 2021 at 11:16

answered May 1, 2021 at 11:00

Andrew Morton

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