如何把Golang编译成DLL文件

package main

import "C"
import "fmt"

//export PrintBye
func PrintBye() {
 fmt.Println("From DLL: Bye!")
}

//export Sum
func Sum(a int, b int) int {
 return a + b;
}

func main() {
 // Need a main function to make CGO compile package as C shared library
}

编译成 DLL 文件：

go build -buildmode=c-shared -o exportgo.dll exportgo.go

编译后得到 exportgo.dll 和 exportgo.h 两个文件。

参考 exportgo.h 文件中的函数定义，撰写 C# 文件importgo.cs：

using System;
using System.Runtime.InteropServices;
namespace HelloWorld
{
 class Hello 
 {
  [DllImport("exportgo.dll", EntryPoint="PrintBye")]
  static extern void PrintBye();

  [DllImport("exportgo.dll", EntryPoint="Sum")]
  static extern int Sum(int a, int b);

  static void Main() 
  {
Console.WriteLine("Hello World!");
PrintBye();

Console.WriteLine(Sum(33, 22));
  }
 }
}

编译 CS 文件得到 exe

csc importgo.cs

将 exe 和 dll 放在同一目录下，运行。

>importgo.exe

Hello World!
From DLL: Bye!
55

补充：

golang 中的 string 参数在 C# 中可以如下引用：

 public struct GoString
 {
  public string Value { get; set; }
  public int Length { get; set; }

  public static implicit operator GoString(string s)
  {
return new GoString() { Value = s, Length = s.Length };
  }

  public static implicit operator string(GoString s) => s.Value;
 }