How Can I Call C# DLLs from My Go Applications?

Utilizing C# DLLs in Go Applications

Calling C# DLLs from Go applications presents a unique challenge. While C/C DLLs can be loaded using syscall, C# assemblies have a different format.

Go-Dotnet Library

Fortunately, a GitHub project called go-dotnet (https://github.com/matiasinsaurralde/go-dotnet) bridges the gap. This library allows Go applications to load and utilize .NET assemblies, including C# DLLs.

Example Usage

Here's an example of how to call a simple C# DLL that adds two numbers:

package main

import (
    "fmt"

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

func main() {
    // Load the C# DLL
    dllPath := "MathForGo.dll"
    assembly, err := dotnet.LoadAssembly(dllPath)
    if err != nil {
        panic(err)
    }

    // Get the "Add" method from the assembly
    method := assembly.Type("Namespace.ClassName").Method("Add")

    // Call the method with arguments
    result, err := method.Invoke(2, 3)
    if err != nil {
        panic(err)
    }

    // Convert the return value to an int
    numResult, err := result.Int()
    if err != nil {
        panic(err)
    }

    fmt.Printf("Result: %d\n", numResult)
}

In this example, the Go-Dotnet library is used to load the C# DLL, retrieve the "Add" method, invoke it with arguments, and convert the return value to an int.

Note: This approach is different from using syscall to load C/C DLLs. The Go-Dotnet library handles the conversion between Go types and .NET types, making it a more convenient solution for calling code written in C#.

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