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If you're trying to use a C# DLL in a Node.js application, the challenge is that C# runs in the .NET runtime, while Node.js runs in a JavaScript environment. You can't directly load a C# DLL in Node.js without some interop mechanism.

How to Make It Work

Here are some ways you can get this working:

Use Edge.js (Best for Simple Calls)

Edge.js is a library that allows you to call C# code from Node.js.

Steps:

1. Install Edge.js:

    npm install edge-js


2. Use it in your Node.js app:

    const edge = require('edge-js');
    
    const myDllMethod = edge.func({
        assemblyFile: 'path/to/your.dll',
        typeName: 'YourNamespace.YourClass',
        methodName: 'YourMethod' // Must be a public static method
    });
    
    myDllMethod(null, function (error, result) {
        if (error) throw error;
        console.log(result);
    });

Pros: Simple to set up Good for small projects

Cons: Only works with synchronous static methods Doesn't support advanced .NET features

Create a .NET Web API and Call It from Node.js

If your DLL has dependencies or needs a runtime, it's better to expose it as an API.

Steps:

1. Create a Web API in .NET Core:



  [ApiController]
    [Route("api/[controller]")]
    public class MyController : ControllerBase
    {
        [HttpGet("call")]
        public IActionResult CallCSharpMethod()
        {
            var result = MyLibrary.MyClass.MyMethod();
            return Ok(result);
        }
    }

Call the API from Node.js using Axios:

const axios = require('axios');

 axios.get('http://localhost:5000/api/MyController/call')
     .then(response => console.log(response.data))
     .catch(error => console.error(error));

Pros: Works for complex logic No need to load DLLs in Node.js

Cons: Requires hosting the API

Run a C# Console App from Node.js

If Edge.js doesn’t work and an API is overkill, you can run a C# console app and get its output.

Steps:

Create a Console App in C#:

class Program { static void Main() { Console.WriteLine(MyLibrary.MyClass.MyMethod()); } }

Call the EXE from Node.js:

const { exec } = require('child_process');

 exec('dotnet myConsoleApp.dll', (error, stdout, stderr) => {
     if (error) console.error(error);
     console.log(stdout);
 });

Pros: No need to modify the DLL Works with any C# logic

Cons: Slower due to process execution

Which One Should You Choose?

 For simple method calls → Use Edge.js
 For a scalable solution → Use a .NET Web API
 If Edge.js doesn’t work → Use the Console App approach

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