netcore热插拔dll

项目中有有些场景用到反射挺多的，用到了反射就离不开dll的加载。此demo适用于通过反射dll运行项目中加载和删除，不影响项目。

ConsoleApp：

using AppClassLibrary;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.Loader;
using System.Threading;

namespace ConsoleApp
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("************非反射调用**************");
            ICommon common = new Say();
            common.Invoke();
            Console.WriteLine("************非反射调用**************");
            Console.WriteLine();
            Console.WriteLine("**************反射调用***************");
            InvokeMethod();
            Console.WriteLine("**************反射调用***************");
            Console.Read();
        }
        private static void InvokeMethod()
        {
            bool IsGo = true;
            while (IsGo)
            {
                Thread.Sleep(3000);
                List<ICommon> common_List = new List<ICommon>();
                var path = Directory.GetCurrentDirectory();
                string[] fileInfos = Directory.GetFiles(path).Where(f => f.Contains("comm")).ToArray();
                var _AssemblyLoadContext = new AssemblyLoadContext(Guid.NewGuid().ToString("N"), true);
                Dictionary<string, ICommon> fileInfoList = new Dictionary<string, ICommon>();
                foreach (var file in fileInfos)
                {
                    ICommon common;
                    using (var fs = new FileStream(file, FileMode.Open, FileAccess.Read))
                    {
                        var assembly = _AssemblyLoadContext.LoadFromStream(fs);
                        Type type = assembly.GetExportedTypes().Where(t => t.GetInterfaces().Contains(typeof(ICommon))).FirstOrDefault();
                        common = Activator.CreateInstance(type) as ICommon;
                    }
                    FileInfo fileInfo = new FileInfo(file);
                    common.Invoke();
                }
            }
        }
    }
    public class Say : ICommon
    {
        public void Invoke()
        {
            Console.WriteLine($"{this.GetType()} Say Method ");
        }
    }
}

接口类库：

using System;

namespace AppClassLibrary
{
    public interface ICommon
    {
        void Invoke();
    }
}

comm_Print.dll：

using AppClassLibrary;
using System;

namespace comm_Print
{
    public class Print : ICommon
    {
        public void Invoke()
        {
            Console.WriteLine($"{this.GetType()} Print Method ");
        }
    }
}

comm_Trace.dll: 

using AppClassLibrary;
using System;

namespace comm_Trace
{
    public class Trace : ICommon
    {
        public void Invoke()
        {
            Console.WriteLine($"{this.GetType()} Trace Method ");
        }
    }
}

下面2个dll可以任意添加删除：

删除trace.dll运行结果: