VB -> C#: NullReferenceException when using the VS extension with .NET Standard

[Keex0r]

Hello,
I am trying to convert some VB.NET code to C# using the Visual Studio extension in VS2019.
When I try to convert a file containing the input code below, an error message is shown:

No output file is generated. The same happens with other source files in the project as well, so it is probably no quirk of the code itself.

The solution contains both .NET Standard and .NET Framework projects, and weirdly this only occurs in .NET Standard (2.0) VB.NET projects. In .NET Framework both VB->C# and C#->VB works, in .NET Standard only C#->VB works.

I have no real clue why. I installed the extension by downloading the installer from the marketplace, instead of installing from the extension manager.
By virtue of the nice async/await stack traces I wasn't really able to find the code where it occurs :-)

Thanks for the work you put in!
Cheers
Jens

Input code

Namespace CAD
    ''' <summary>
    ''' Represents a CAD RGB Color tuple
    ''' </summary>
    Public Structure CADColor
        Public Sub New(A As Byte, R As Byte, G As Byte, B As Byte)
            Me.A = A
            Me.R = R
            Me.G = G
            Me.B = B
        End Sub
        Public Sub New(R As Byte, G As Byte, B As Byte)
            Me.A = 255
            Me.R = R
            Me.G = G
            Me.B = B
        End Sub
        Public Property A As Byte
        Public Property R As Byte
        Public Property G As Byte
        Public Property B As Byte

        Public Shared Function FromArgb(R As Byte, G As Byte, B As Byte) As CADColor
            Return FromArgb(255, R, G, B)
        End Function
        Public Shared Function FromArgb(A As Byte, R As Byte, G As Byte, B As Byte) As CADColor
            Return New CADColor(A, R, G, B)
        End Function
    End Structure
End Namespace

Details

• Product in use: VS extension
• Version in use: 7.2.0.0
• Did you see it working in a previous version, which? --> Never used the extension before

[GrahamTheCoder]

Thanks for the full diagnosis. I don't think there's currently a test for a VB. Net standard project, so we should add one in to the project and solution tests. Looks like the error is around the ConvertProjectContents method, it'll be easy to see in a debugger. Happy to accept a PR, or I'll hopefully get around to releasing a fix in a month or so.

…

On Thu, 24 Oct 2019, 23:50 Keex0r, ***@***.***> wrote: Hello, I am trying to convert some VB.NET code to C# using the Visual Studio extension in VS2019. When I try to convert a file containing the input code below, an error message is shown: [image: CodeConvertError] <https://user-images.githubusercontent.com/8248242/67491359-1aa2e380-f675-11e9-8f1d-e0dcb36baa86.png> No output file is generated. The solution contains both .NET Standard and .NET Framework projects, and weirdly this only occurs in .NET Standard (2.0) VB.NET projects. In .NET Framework both VB->C# and C#->VB works, in .NET Standard only C#->VB works. I have no real clue why. I installed the extension by downloading the installer from the marketplace, instead of installing from the extension manager. By virtue of the nice async/await stack traces I wasn't really able to find the code where it occurs :-) Thanks for the work you put in! Cheers Jens Input code Namespace CAD ''' <summary> ''' Represents a CAD RGB Color tuple ''' </summary> Public Structure CADColor Public Sub New(A As Byte, R As Byte, G As Byte, B As Byte) Me.A = A Me.R = R Me.G = G Me.B = B End Sub Public Sub New(R As Byte, G As Byte, B As Byte) Me.A = 255 Me.R = R Me.G = G Me.B = B End Sub Public Property A As Byte Public Property R As Byte Public Property G As Byte Public Property B As Byte Public Shared Function FromArgb(R As Byte, G As Byte, B As Byte) As CADColor Return FromArgb(255, R, G, B) End Function Public Shared Function FromArgb(A As Byte, R As Byte, G As Byte, B As Byte) As CADColor Return New CADColor(A, R, G, B) End Function End StructureEnd Namespace Details - Product in use: VS extension - Version in use: 7.2.0.0 - Did you see it working in a previous version, which? --> Never used the extension before — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#398?email_source=notifications&email_token=AATAA4TKCMILE4VQVZ3DNVDQQGR4BA5CNFSM4JEULDYKYY3PNVWWK3TUL52HS4DFUVEXG43VMWVGG33NNVSW45C7NFSM4HUD4H2Q>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AATAA4VLYTD4EYCISL7YNJLQQGR4BANCNFSM4JEULDYA> .