unity跨平台及热更新学习笔记-C#中通过程序域实现DLL的动态加载与卸载

创建C#控制台程序，项目结构如下:

HotUpdate是一个控制台应用程序,CommonLib、MoudleAdditive是两个类库。

CommonLib中的代码:

using System;

namespace CommonLib
{
    public interface ICalculater
    {
        int Calculater(int a, int b);
    }
}

MoudleAdditive中的代码:

using CommonLib;
using System;

namespace MoudleAdditive
{
    public class MoudleAdditive : MarshalByRefObject, ICalculater
    {
        public int Calculater(int a, int b)
        {
            int res = a + b;
            Console.WriteLine("相加结果:" + res + " [Current Domain :" + AppDomain.CurrentDomain.FriendlyName + "]");
            return res;
        }
    }
}

HotUpdate中的代码:

using CommonLib;
using System;
using System.IO;

namespace HotUpdate
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Current Domain : " + AppDomain.CurrentDomain.FriendlyName + Environment.NewLine);
            Console.WriteLine("输入两个数字(a,b),计算结果:");
            Console.Write("a = ");
            int a = Convert.ToInt32(Console.ReadLine());
            Console.Write("b = ");
            int b = Convert.ToInt32(Console.ReadLine());

            AppDomain additiveDomain = AppDomain.CreateDomain("Domain #Calculater");
            ICalculater calculater = (ICalculater)additiveDomain.CreateInstanceAndUnwrap("MoudleAdditive", "MoudleAdditive.MoudleAdditive");
            calculater.Calculater(a, b);

            Console.WriteLine("输入 quit 退出，输入 delete 删除当前AppDomain,输入 reload 重新加载 AppDomain");
            string command;
            while ((command = Console.ReadLine().ToLower()) != "quit")
            {
                switch (command)
                {
                    case "delete":
                        TryDelete("MoudleAdditive.dll");
                        Console.WriteLine();
                        break;
                    case "unload":
                        UnloadDomain(additiveDomain);
                        Console.WriteLine();
                        break;
                    case "reload":
                        AppDomain appDomain;
                        if (ReloadDomain(out appDomain))
                        {
                            ICalculater cal = (ICalculater)appDomain.CreateInstanceAndUnwrap("MoudleAdditive", "MoudleAdditive.MoudleAdditive");
                            cal.Calculater(a, b);
                        }
                        Console.WriteLine();
                        break;
                    default:
                        break;
                }
            }

            Console.ReadKey();
        }

        static void TryDelete(string filename)
        {
            try
            {
                string fullName = AppDomain.CurrentDomain.BaseDirectory + filename;
                File.Delete(fullName);
                Console.WriteLine("成功删除文件 :{0}", fullName);
            }
            catch (Exception e)
            {
                Console.WriteLine("删除文件: {0} 失败，{1}", filename, e.Message);
            }
        }

        static void UnloadDomain(AppDomain appDomain)
        {
            if (null == appDomain) return;
            string appDomainName = appDomain.FriendlyName;
            AppDomain.Unload(appDomain);
            Console.WriteLine("卸载程序域 {0} 成功!", appDomainName);
        }

        static bool ReloadDomain(out AppDomain appDomain)
        {
            try
            {
                appDomain = AppDomain.CreateDomain("Domain #Calculater");
                Console.WriteLine("Domain reloaded, name : Domain #Calculater");
                return true;
            }
            catch
            {
                appDomain = null;
                return false;
            }
        }
    }
}

详细原理,请参看:https://www.cnblogs.com/Leo_wl/p/4255533.html