When developing in .NET, it is crucial to release COM objects explicitly using Marshal.ReleaseComObject() to prevent Inventor from staying open in the background (hanging processes).
: C:\Program Files\Autodesk\Inventor 20xx\Bin\Public Assemblies\Autodesk.Inventor.Interop.dll (where 20xx is your active version). autodesk.inventor.interop.dll
Similar path under the respective version folder. When developing in
Without this DLL, a .NET developer would have to write complex, error-prone COM interop code manually. With it, you can write intuitive code like: Without this DLL, a
If you find autodesk.inventor.interop.dll too brittle or deployment-heavy, consider these alternatives:
Another common issue is a version mismatch. Since the Interop DLL is version-specific, an application compiled against Inventor 2023.5 may fail to run on Inventor 2023.4, generating an error because it cannot locate the exact version (e.g., 27.5.0.0 vs. 27.4.0.0 ) it was built with.
(e.g., how to change iProperties, export STEP files).