using System;

using System.Reflection;

using HarmonyLib;       

​

public class A

{

    public void Foo()

    {

        Console.WriteLine("Foo");

    }

}

​

public static class A_Foo_Fix

{

    public static void Before()

    {

        Console.WriteLine("Before Foo");

    }

​

    public static void After()

    {

        Console.WriteLine("After Foo");

    }

}

​

public class Program

{

    public static void Main()

    {

        // Initialize Harmony

        Harmony harmony = new Harmony("APCWebSystem");

​

        // Apply patch

        harmony.Patch(

            typeof(A).GetMethod(nameof(A.Foo)),

            new HarmonyMethod(typeof(A_Foo_Fix).GetMethod(nameof(A_Foo_Fix.Before))),

            new HarmonyMethod(typeof(A_Foo_Fix).GetMethod(nameof(A_Foo_Fix.After)))

        );

        // Test

        new A().Foo();

    }

}