iLogic rules didn't run via Dotnet programming in Inventor 2025

[eyad_ahmed_hegazy_2012]

Hi Guys
Before Inventor  2025 we can use the following sample of  c# .net code to run the document iLogic rules 

in winform with dotnet 4.8

            ApplicationAddIn Addins = InventorApplication.ApplicationAddIns.ItemById["{3bdd8d79-2179-4b11-8a5a-257b1c0263ac}"];
            if (!Addins.Activated)
                Addins.Activate();
            dynamic _iLogicAutomation = Addins.Automation;
            var Rules = _iLogicAutomation.Rules(doc);

and when we go with Inventor 2025 we get these error :

Message = "Typelib export: Type library is not registered. (Exception from HRESULT: 0x80131165)"

StackTrace = " at System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo)\r\n at System.Dynamic.ComRuntimeHelpers.GetITypeInfoFromIDispatch(IDispatch dispatch, Boolean throwIfMissingExpectedTypeInfo)\r\n at System.Dyna...

we fail to run iLogic on inventor 2025 and it run correctly in version of 2024 or later

[CattabianiI]

Instead of use dynamic at line 4:

IiLogicAutomation _iLogicAutomation = (IiLogicAutomation)Addins.Automation;

[lsyKDKZS]

I have the exact same problem as described here, but the suggested fix just gives me another error:

System.InvalidCastException: 'Unable to cast COM object of type 'System.__ComObject' to interface type 'Autodesk.iLogic.Interfaces.IiLogicAutomation'. This operation failed because the QueryInterface call on the COM component for the interface with IID '{91DF0977-6AF7-305B-A571-67AF76D7A4C9}' failed due to the following error: No such interface supported (Exception from HRESULT: 0x80004002 (E_NOINTERFACE)).'

Has anyone else tried this fix also?

[MjDeck]

@lsyKDKZS , is your code in an external EXE that connects to Inventor? Or is it in an add-in?

[lsyKDKZS]

@MjDeck The error happens when running an external EXE, for debugging purposes, that connects to Inventor through COM. It seems to work fine when running as a plugin in Autodesk Platform Services.

[MjDeck · Accepted solution]

Here's source for a sample app that runs the rules in the active document.
Note that this project is targeted to .NET 8. In Inventor 2025, the desktop version of Inventor is running on .NET 8. Inventor 2024 ran on .NET Framework 4.8.

[lsyKDKZS]

@MjDeck Thank you! Your example works and I can confirm that the issue is .NET 4.8 vs .NET 8.

[MjDeck]

@lsyKDKZS , there is a way to make it work from .NET 4.8 by making calls to low-level late binding system functions. This requires extra code, but if you don't have a lot of calls to the iLogic API then it might be manageable. Here's a sample .NET Framework 4.8 project. You can use the same code in .NET 8.

[eyad_ahmed_hegazy_2012]

External exe

[eyad_ahmed_hegazy_2012]

Thanks

I will try

[ole.lyso]

Edit: @MjDeck 's solution works perfectly for all issues related to this.