Unable to load DocumentFormat.OpenXml.dll into AutoCAD 2025
Later versions of AutoCAD comes with a version of DocumentFormat.OpenXml.dll. So, you should tell how you set reference to it: you use the one coming with AutoCAD, or use NuGet package (thus the latest version)?
The one coming with AutoCAD does not have DocumentFormat.OpenXml.Framework.dll, which is a required dependency if you use the latest version of DocumentFormat.OpenXml.dll from NuGet package.
Since we are doing Acad2025/.NET 8.0, we should always use NuGet package for the latest version of it and make sure all the dependency DLLs in the NuGet package are deployment with the AutoCAD plugin DLL. So, you need to look into your plugin DLL folder where you NETLOAD it from: do all the DLLs coming with the NuGet package be there?
Make sure you have properly edited the Plugin's *.projcs file, as shown below:
I did a quick test with following code, which refers an enum type in DocumentFormat.OpenXml.dll. It works OK, meaning the DocumentFormat.OpenXml.dll is loaded into AutoCAD 2025 correctly.:
[CommandMethod("OpenXmlTest")]
public static void RunMyCommand()
{
var dwg = CadApp.DocumentManager.MdiActiveDocument;
var ed = dwg.Editor;
var obj = DocumentFormat.OpenXml.PresentationDocumentType.Presentation;
ed.WriteMessage($"\nOpenXml.PresentationDocumentType: {obj}");
}
Edit:
I added reference from NuGet package, which is in its version 3.10, as opposed to version 2.16, the one comes with AutoCAD2024/2025.
HTH.
Hi,
Thank you for the reply.
I do have the CopyLocalLockFileAssemblies set to true is .csproj.
I'm using the latest NuGet packet. The versions are 3.1.0 for both the DocumentFormat.OpenXml.dll and DocumentFormat.OpenXml.Framework.dll.
I tried loading the 2.16.0 version that comes with AutoCAD 2025, it loads without issue. But when I try to load the 3.1.0 version file it gives the above mentioned error and does not load the dll.
I have these two dlls in the plugin folder.
Is this an AutoCAD bug? Would re-installing AutoCAD work?
As I replied previously, the simple code I tested runs OK. Just to prove both DocumentFormat.OpenXml.dll and DocumentFormat.OpenXml.Framework.dll are loaded with my simple plugin, I did minor update to let the code refer 2 enum tyles, one from DocumentFormat.OpenXml.dll and the other from DocumentFormat.OpenXml.Framework.dll and the code run as expected:
using DocumentFormat.OpenXml;
[assembly: CommandClass(typeof(DocumentOpenXmlTest.MyCommands))]
[assembly: ExtensionApplication(typeof(DocumentOpenXmlTest.MyCommands))]
namespace DocumentOpenXmlTest
{
public class MyCommands : IExtensionApplication
{
[CommandMethod("OpenXmlTest")]
public static void RunMyCommand()
{
var dwg = CadApp.DocumentManager.MdiActiveDocument;
var ed = dwg.Editor;
// enum type "PresentationDocumentType" from DocumentFormat.OpenXml.dll
var obj = DocumentFormat.OpenXml.PresentationDocumentType.Presentation;
// enum type "FileFormatVersions" from DocumentFormat.OpenXml.Framework.dll
var fileVersion = FileFormatVersions.Office2016;
ed.WriteMessage($"\nOpenXml.PresentationDocumentType: {obj}");
ed.WriteMessage($"\nOpenXml.FileFormatVersion: {fileVersion}");
}
public void Initialize()
{
var dwg = CadApp.DocumentManager.MdiActiveDocument;
if (dwg!=null)
{
dwg.Editor.WriteMessage("\nOpenXml Test project loaded.");
}
}
public void Terminate()
{
}
}
}I'll take the simple test plugin to one of my other computer for a test (maybe later today) and post back.
FYI:
I have test my simple DocumentFormat.OpenXml project in my other computers with AutoCAD 2025 and AutoCAD Civil3d 2025, and it worked as expected. That is, there is no issue of loading lasted version of DocumentFormat.OpenXml.dll and DocumentFormat.OpenXml.Frametwork.dll from NuGet (v3.1.0).
So,
I tried loading the dll on a new laptop and freshly installed AutoCAD 2025. The dll still refuses to load.
Below is the acad.exe details
The 2 computers I tried my code with Document.Format.OpenXml successfully both have Acad2025.1 update installed when the code was tried:
