How to Build an Autodesk Inventor Add‑In with .NET 8 + Cursor (AI) in 5 Minutes

The landscape of engineering automation is shifting under our feet. For years, developing for Autodesk Inventor meant wrestling with the aging .NET Framework and navigating dense API documentation. But with the release of Inventor 2025 and 2026, the transition to .NET 8 has unlocked a new era of performance and modern development practices.

When you pair this modern framework with AI-native code editors like Cursor, the barrier to entry for high-performance CAD automation disappears. What used to take days of environment setup and boilerplate coding now takes minutes. At Aboni Tech, we are seeing manufacturing leaders leverage these tools to turn months of manual design work into automated, error-free workflows.

This post is the first in a 10-part series exploring how the intersection of .NET 8 and AI is revolutionizing the way we build engineering software.

why the move to .net 8 changes everything

For the uninitiated, the move from .NET Framework 4.8 to .NET 8 isn't just a version bump; it’s a complete platform migration. .NET 8 provides significant performance improvements, especially in memory management and execution speed. For Inventor users, this means add-ins that load faster, calculate complex geometry more efficiently, and integrate seamlessly with modern cloud services.

By adopting these modern tools, engineering departments can:

• Reduce technical debt by moving away from legacy codebases.
• Attract top-tier talent who prefer modern development environments over 15-year-old tech.
• Facilitate faster deployment cycles with improved compilation tools.

the secret weapon: cursor (ai)

Cursor is a fork of VS Code that integrates Large Language Models directly into the editor’s core. Unlike a standard plugin, Cursor understands your entire codebase, the Inventor API structure, and the nuances of C# in a .NET 8 environment. It doesn't just suggest code; it writes functional logic, debugs errors, and refactors legacy snippets in real-time.

step 1: prepare your environment (60 seconds)

Before we dive into the code, ensure your machine is ready for modern development. You will need:

• Visual Studio 2022 (version 17.8 or later): Necessary for .NET 8 support.
• Inventor 2025 or 2026 SDK: This contains the essential libraries and the DeveloperTools.msi.
• Cursor: Download and install the Cursor editor.
• The SDK Templates: Run the DeveloperTools.msi from your Inventor installation folder (typically C:\Users\Public\Documents\Autodesk\Inventor 2026\SDK).

step 2: scaffold the project (60 seconds)

Open Visual Studio and create a new project using the Autodesk Inventor AddIn template. Ensure you target .NET 8.0. This template creates the basic structure, including the StandardAddInServer.cs file, which is the heart of your add-in.

Once the project is created, close Visual Studio and open the project folder in Cursor. This is where the speed comes in.

step 3: the ai-assisted build (120 seconds)

In Cursor, open the StandardAddInServer.cs file. Instead of manually typing out the ribbon button logic or the event handlers, use the Cursor "Composer" (Cmd+I or Ctrl+I).

Give the AI a prompt like:
"In this .NET 8 Inventor Add-in, create a new ribbon button titled 'Aboni Automation' in the 'Tools' tab. When clicked, it should iterate through all components in the active assembly and report the total mass in a message box."

Cursor will analyze the Inventor API and generate the necessary boilerplate:

1. Button definition: Creating the UI elements.
2. Event handling: Connecting the click event to a function.
3. Core logic: Using the Inventor API to calculate mass.

Because Cursor is aware of the .NET 8 syntax, it will use modern C# features that make the code cleaner and more maintainable than legacy examples you might find in old forums. If you encounter an error, simply highlight the code and ask Cursor to "Fix this for the Inventor 2026 API," and it will resolve version-specific nuances instantly.

step 4: configuration and deployment (60 seconds)

Every Inventor add-in requires an .addin XML file. This file tells Inventor where your DLL is and how to load it.

Ask Cursor: "Generate an .addin file for this project with a Client ID (GUID) and set it to load on startup for Inventor version 29 (2025) and 30 (2026)."

Copy the generated XML into a file named MyAddin.addin. In your project settings, ensure your build output is directed to:
%AppData%\Autodesk\ApplicationPlugins\YourAddInName\

Set your deployment mode to "Framework-dependent" with a win-x64 target. This ensures the add-in utilizes the high-performance .NET 8 runtime installed with Inventor.

strategic value for manufacturing leaders

While the technical speed is impressive, the strategic value for a manufacturing company is the real story. We often see companies stuck with 5 common CAD automation mistakes, the most frequent being the "siloed developer" who spends weeks writing code that could be generated in hours.

By adopting a .NET 8 + AI workflow, you are:

• Saving time: Reducing development hours by 70-80% for common UI and data tasks.
• Ensuring data consistency: Using AI to enforce coding standards across the team.
• Streamlining integration: Easily connecting Inventor to ERP or PLM systems using modern REST APIs that were difficult to implement in .NET Framework.

"The shift to .NET 8 was the catalyst we needed. Integrating AI into that workflow didn't just speed us up: it changed the complexity of the problems we are willing to solve." : Engineering Manager, Tier 1 Automotive Supplier.

the fastest way to scale

Building a single button is a great start, but the real power lies in full-scale software integration. Whether you are automating complex geometry generation or syncing real-time BOM data, the foundation remains the same. Modern tools empower smaller teams to achieve results that previously required massive IT budgets.

If you want to dive deeper into how this transition impacts your specific infrastructure, you can read our detailed guide on the fastest way to build powerful Inventor add-ins.

let’s work together

At Aboni Tech, we specialize in helping companies navigate the complexities of engineering automation and software integration. Whether you are looking to migrate legacy add-ins to .NET 8 or want to build a custom automation suite from scratch, we have the expertise to help you excel.

We excel at taking manual, repetitive engineering tasks and turning them into automated competitive advantages. If you’re ready to see how .NET 8 and AI can transform your engineering department, explore our blog for more insights or contact us directly.

We can’t wait to hear from you. Let's build the future of manufacturing together.