Issues porting to 2025 .net 8.0 - C# but compiler thinks Visual basic?

[kelsey_williams_QHECPT4QJFDH]

I'm trying to port a project to 2025 / .net 8.0. It isn't working and as a sanity check ive created the "first autocad project" As per the .net 2025 guide.

Code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using Autodesk.AutoCAD.Runtime;
using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;

[assembly: CommandClass(typeof(MyFirstProject1.Class1))]

namespace MyFirstProject1
{
    public class Class1
    {
        [CommandMethod("AdskGreeting")]
        public void AdskGreeting()
        {
            // Get the current document and database, and start a transaction
            Document acDoc = Application.DocumentManager.MdiActiveDocument;
            Database acCurDb = acDoc.Database;

            // Starts a new transaction with the Transaction Manager
            using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction())
            {
                // Open the Block table record for read
                BlockTable acBlkTbl;
                acBlkTbl = acTrans.GetObject(acCurDb.BlockTableId,
                                             OpenMode.ForRead) as BlockTable;

                // Open the Block table record Model space for write
                BlockTableRecord acBlkTblRec;
                acBlkTblRec = acTrans.GetObject(acBlkTbl[BlockTableRecord.ModelSpace],
                                                OpenMode.ForWrite) as BlockTableRecord;

                /* Creates a new MText object and assigns it a location,
                text value and text style */
                using (MText objText = new MText())
                {
                    // Specify the insertion point of the MText object
                    objText.Location = new Autodesk.AutoCAD.Geometry.Point3d(2, 2, 0);

                    // Set the text string for the MText object
                    objText.Contents = "Greetings, Welcome to AutoCAD .NET";

                    // Set the text style for the MText object
                    objText.TextStyleId = acCurDb.Textstyle;

                    // Appends the new MText object to model space
                    acBlkTblRec.AppendEntity(objText);

                    // Appends to new MText object to the active transaction
                    acTrans.AddNewlyCreatedDBObject(objText, true);
                }

                // Saves the changes to the database and closes the transaction
                acTrans.Commit();
            }
        }
    }
}

Having issues with the reference files, I've downloaded from here:

AutoCAD ObjectARX SDK downloads | Autodesk Platform Services

Also tried using the same dll files from autocad civil3d installation and both are giving errors:

Severity	Code	Description	Project	File	Line	Suppression State
Error (active)	CS0103	The name 'Application' does not exist in the current context	testclass	"my path" - Documents\Code\net8 tester\testclass\Class1.cs	20	

When I compile it complains that bout different versions of microsoft.visualbasic? I'm not using visual basic?!

Severity	Code	Description	Project	File	Line	Suppression State
Warning (active)	MSB3277	Found conflicts between different versions of "Microsoft.VisualBasic" that could not be resolved.
There was a conflict between "Microsoft.VisualBasic, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" and "Microsoft.VisualBasic, Version=10.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a".
    "Microsoft.VisualBasic, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" was chosen because it was primary and "Microsoft.VisualBasic, Version=10.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" was not.
    References which depend on "Microsoft.VisualBasic, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" [C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\8.0.7\ref\net8.0\Microsoft.VisualBasic.dll].
        C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\8.0.7\ref\net8.0\Microsoft.VisualBasic.dll
          Project file item includes which caused reference "C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\8.0.7\ref\net8.0\Microsoft.VisualBasic.dll".
            C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\8.0.7\ref/net8.0/Microsoft.VisualBasic.dll
    References which depend on or have been unified to "Microsoft.VisualBasic, Version=10.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" [].
        C:\Program Files\Autodesk\AutoCAD 2025\accoremgd.dll
          Project file item includes which caused reference "C:\Program Files\Autodesk\AutoCAD 2025\accoremgd.dll".
            accoremgd
        C:\Program Files\Autodesk\AutoCAD 2025\acdbmgd.dll
          Project file item includes which caused reference "C:\Program Files\Autodesk\AutoCAD 2025\acdbmgd.dll".
            Acdbmgd
            accoremgd
            AeccDbMgd
        C:\Program Files\Autodesk\AutoCAD 2025\C3D\AeccDbMgd.dll
          Project file item includes which caused reference "C:\Program Files\Autodesk\AutoCAD 2025\C3D\AeccDbMgd.dll".
            AeccDbMgd
        C:\Program Files\Autodesk\AutoCAD 2025\C3D\AeccHydroCalcsMgd.dll
          Project file item includes which caused reference "C:\Program Files\Autodesk\AutoCAD 2025\C3D\AeccHydroCalcsMgd.dll".
            AeccDbMgd	testclass	C:\Program Files\Microsoft Visual Studio\2022\Community\MSBuild\Current\Bin\amd64\Microsoft.Common.CurrentVersion.targets	2401	

Tried using the nuget for the autocad references but it doesnt work, compiles fine but when I load it to a drawing none of the commands show up.

Anyone know whats up?

[_gile · Accepted solution]

Hi,

When you started your project in Visual Studio, did you choose the class library project template that targets .NET or .NET Standard (not the one that target .NET Framework)?

Anyway, you could use this AutoCAD plugin project template after having edited the different files so that the AutoCAD libraries match those on the local computer.

[kelsey_williams_QHECPT4QJFDH]

Fairly certain I did .net 8.0 (long term support). Your template worked, thanks!