topic Re: VS Code Error in Revit API Forum

VS Code Error

sragan — Fri, 01 Aug 2025 14:20:58 GMT

Trying to update a Macro from Revit 2024 to 2025 with the new VS Code enviroment. I copied the macro to the 2025 directory, and hit the Macro Edit Button. When VS Code opens, I type "dotnet build" in the terminal window. The build is successful, but I get a couple of warnings. It looks like somewhere I have references to older Windows Forms and System Drawing DLL's. The Macro won't run (it still has the red symbol on the icon in the Macro Manager, like it hasn't been successfuly built.)

How do I fix this? Here is the error message VS Code gives.

There was a conflict between "System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" and "System.Drawing, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a".
"System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" was chosen because it was primary and "System.Drawing, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" was not.
References which depend on "System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" [C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.5\System.Drawing.dll].
C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.5\System.Drawing.dll
Project file item includes which caused reference "C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.5\System.Drawing.dll".
System.Drawing
References which depend on or have been unified to "System.Drawing, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" [].
C:\ProgramData\Autodesk\Revit\Macros\2025\RevitAPI.dll
Project file item includes which caused reference "C:\ProgramData\Autodesk\Revit\Macros\2025\RevitAPI.dll".
..\..\..\..\..\RevitAPI.dll
..\..\..\..\..\RevitAPIUI.dll
C:\ProgramData\Autodesk\Revit\Macros\2025\RevitAPIUI.dll
Project file item includes which caused reference "C:\ProgramData\Autodesk\Revit\Macros\2025\RevitAPIUI.dll".
..\..\..\..\..\RevitAPIUI.dll
C:\Program Files\dotnet\sdk\9.0.100\Microsoft.Common.CurrentVersion.targets(2413,5): warning MSB3277:
Found conflicts between different versions of "System.Windows.Forms" that could not be resolved.
There was a conflict between "System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" and "System.Windows.Forms, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089".
"System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" was chosen because it was primary and "System.Windows.Forms, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" was not.
References which depend on "System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" [C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.5\System.Windows.Forms.dll].
C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.5\System.Windows.Forms.dll
Project file item includes which caused reference "C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.5\System.Windows.Forms.dll".
System.Windows.Forms
References which depend on or have been unified to "System.Windows.Forms, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" [].
C:\ProgramData\Autodesk\Revit\Macros\2025\RevitAPIUI.dll
Project file item includes which caused reference "C:\ProgramData\Autodesk\Revit\Macros\2025\RevitAPIUI.dll".
..\..\..\..\..\RevitAPIUI.dll

Re: VS Code Error

Charles.Piro — Fri, 01 Aug 2025 14:47:21 GMT

Hi,

For Revit 2025, you need to upgrade your solution from NET4.8 to NET CORE 8.0.

You can look this link : https://thebuildingcoder.typepad.com/blog/2024/04/migrating-from-net-48-to-net-core-8.html

😉

Re: VS Code Error

sragan — Fri, 01 Aug 2025 15:31:28 GMT

There is a whole lot of info. and links in that post, but I don't see anything specific to Revit Macros or the new VS Code Editor Revit 2025 uses.

Probably great for professional programmers, but not so great for others who use Macros for the simplicity.

Re: VS Code Error

ctm_mka — Fri, 01 Aug 2025 15:36:46 GMT

@sragan having no actual experience with macros, i can only offer this as a workaround:

copy the code in 2024 to a text editor.
start new macro in 2025.
copy code back to 2025.

My thought being that at least this will get around the issue of not being able to upgrade as shown in that link.

Re: VS Code Error

sragan — Fri, 08 Aug 2025 21:19:16 GMT

Thats's the only way I got it to work. I thought it was going to be a real pain to add windows forms, but I only needed to add one line of code to the csproj file. Like this:

<Project Sdk="Microsoft.NET.Sdk"> <PropertyGroup> <TargetFramework>net8.0-windows</TargetFramework> <ImplicitUsings>enable</ImplicitUsings> <UseWindowsForms>true</UseWindowsForms> <UseWPF>true</UseWPF> <Nullable>enable</Nullable> </PropertyGroup>

I also had to update the AddParameter methods, like this;

//FamilyParameter fp = famMan.AddParameter (eD,BuiltInParameterGroup.PG_ELECTRICAL_LIGHTING,false); becomes: FamilyParameter fp = famMan.AddParameter (eD,GroupTypeId.ElectricalLighting,false); }

And there is the usual frustration that usually comes with copying and pasting code - - one "}" always seems to be missing, extra, or just in the wrong place.

But it does work.