Unable to get working using .NET 6

. . .

The question is related to:

• DllExport -version: v1.7.4.29858+c1cc52f
• Copy-paste from Data tab:

Installed: True; 1.7.4+c1cc52f; invoked: 1.7.4
Project type: Cs
Storage: ProjectFiles
Compiler.Platform: x86
Compiler.ordinalsBase: 1
Compiler.rSysObj: False
Compiler.ourILAsm: False
Compiler.customILAsm: 
Compiler.genExpLib: False
Compiler.peCheck: PeIl
Compiler.patches: None
PreProc.Type: None
PreProc.Cmd: 
PostProc.Type: None
PostProc.ProcEnv: $(SolutionPath);$(MSBuildThisFileFullPath)
PostProc.Cmd: 
SignAssembly: 
Identifier: BAE5D459-7C5A-46D1-9FE6-CF553C60A438
Instance: C:\Program Files\Microsoft Visual Studio\2022\Enterprise\MSBuild\Current\Bin\amd64\MSBuild.exe
Project path: C:\Users\user\Documents\Visual Studio Projects\COMLibraryCore\COMLibraryCore\COMLibraryCore.csproj
Action: Configure
PlatformTarget: x86
TargetFramework: net6.0-windows
TargetFrameworks: 
TargetFrameworkVersion: 
RootNamespace: 
AssemblyName: 
MgrArgs: 
MetaLib: tools\raw\lib\net20\DllExport.dll
MetaCor: tools\raw\lib\netstd\DllExport.dll
Proxy: 
StoragePath: .net.dllexport.targets
ddNS: COMLibraryCore
ddNS max buffer: 500
UseCecil: True
intermediateFiles: False
timeout: 30000
Options: None
RootPath: C:\Users\user\Documents\Visual Studio Projects\COMLibraryCore\
PkgPath: C:\Users\user\Documents\Visual Studio Projects\COMLibraryCore\packages\\DllExport.1.7.4\
SlnFile: 
SlnDir: C:\Users\user\Documents\Visual Studio Projects\COMLibraryCore\
DxpTarget: tools\net.r_eg.DllExport.targets
MsgGuiLevel: -1
LockIfError: 

---

Goal: To call a C# library DLL from Access VBA.

I got the below code working using .NET Framework 4.8:

using System.Runtime.InteropServices;

namespace COMLibrary;

public interface IComClass1Interface
{
    string HelloWorld { get; }
    string Delme();
}

[ComVisible(true)]
public class ComClass1 : IComClass1Interface
{
    public string HelloWorld { get { return "From DLL: Hello, World!"; } }

    public string Delme() => "From DLL: Hello, World!";
}

static class UnmanagedExports
{
    [DllExport]
    [return: MarshalAs(UnmanagedType.IDispatch)]
    static object CreateDotNetObject()
    {
        return new ComClass1();
    }
}

And calling from VBA:

Public Declare Function CreateDotNetObject Lib "C:\Users\user\Documents\Visual Studio Projects\COMLibrary\COMLibrary\bin\Debug\COMLibrary.dll" () As Object

Public Sub test()

    Dim o
    Set o = CreateDotNetObject()
    MsgBox o.HelloWorld
    Set o = Nothing

End Sub

However, when I use the same code in a .NET 6 project MS Access crashes when the VBA call is made. I’ve tried changing several things with no success. Dependencies tool shows the same CreateDotNetObject entry point in the DLL file, so it’s not that.

What do I need to do to get this working with .NET 6?

[3F]

How you mean by targeting via .NET core?

@Shpendicus,

targeting via supported .NET Core TFMs

For example, .NET Core 2.2, or .NET Standard 2

<TargetFrameworks>netstandard2.0</TargetFrameworks>

Also note, lower version can be evaluated in higher Runtime. This is for the case when the module as an intermediary.

[Shpendicus]

Btw, I have donated you a monthly-fee for your work as a thanks to such big work, since every time I wanted something like COM or hard low level it’s a pain in the ass, if you are not yet that good of a programmer, so yea pls keep up the dev of “DllExport” and also “Corini” to be usable fully with .NET 6 , in that sense, that you can export a .NET object/function even when u make use of all what is in .NET 6 and C# 10 😃