Can Go Applications Directly Use C# DLLs, and If Not, What Workarounds Exist?

Using C# DLLs in Go Applications: Can It Be Done?

Calling C# DLLs from Go applications has been a topic of discussion for some time, and while it's not a straightforward process like using C or C DLLs, it is possible with the help of external libraries.

Current Possibilities in Go

At present, there are limited options for directly using C# DLLs in Go. The golang.org/x/sys/windows package provides some support for calling Windows DLLs from Go, but it does not extend to C# DLLs.

Alternative Solution

Thankfully, a project on GitHub named go-dotnet aims to bridge the gap between Go and .NET assemblies. By integrating a COM-based interop library, go-dotnet enables Go applications to call C# methods.

Example

To demonstrate how to use go-dotnet, let's consider a simple C# DLL that adds two numbers:

public class Adder
{
    public static int Add(int a, int b)
    {
        return a + b;
    }
}

In Go, we can use go-dotnet to interface with this DLL:

package main

import (
    "fmt"

    "github.com/matiasinsaurralde/go-dotnet/dotnet"
)

func main() {
    assembly, err := dotnet.AsAssembly("MathForGo.dll")
    if err != nil {
        panic(err)
    }

    adderType, err := assembly.Type("MathForGo.Adder")
    if err != nil {
        panic(err)
    }

    addMethod, err := adderType.Method("Add")
    if err != nil {
        panic(err)
    }

    result, err := addMethod.Invoke(2, 3)
    if err != nil {
        panic(err)
    }

    fmt.Printf("%v\n", result) // Prints "5"
}

Please note that additional setup may be required for go-dotnet to function properly, such as adjusting system paths or using a version of Go that supports COM interop.

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