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：

 1 using AppClassLibrary;
 2 using System;
 3 using System.Collections.Generic;
 4 using System.IO;
 5 using System.Linq;
 6 using System.Runtime.Loader;
 7 using System.Threading;
 8 
 9 namespace ConsoleApp
10 {
11     class Program
12     {
13         static void Main(string[] args)
14         {
15             Console.WriteLine("************非反射调用**************");
16             ICommon common = new Say();
17             common.Invoke();
18             Console.WriteLine("************非反射调用**************");
19             Console.WriteLine();
20             Console.WriteLine("**************反射调用***************");
21             InvokeMethod();
22             Console.WriteLine("**************反射调用***************");
23             Console.Read();
24         }
25         private static void InvokeMethod()
26         {
27             bool IsGo = true;
28             while (IsGo)
29             {
30                 Thread.Sleep(3000);
31                 List<ICommon> common_List = new List<ICommon>();
32                 var path = Directory.GetCurrentDirectory();
33                 string[] fileInfos = Directory.GetFiles(path).Where(f => f.Contains("comm")).ToArray();
34                 var _AssemblyLoadContext = new AssemblyLoadContext(Guid.NewGuid().ToString("N"), true);
35                 Dictionary<string, ICommon> fileInfoList = new Dictionary<string, ICommon>();
36                 foreach (var file in fileInfos)
37                 {
38                     ICommon common;
39                     using (var fs = new FileStream(file, FileMode.Open, FileAccess.Read))
40                     {
41                         var assembly = _AssemblyLoadContext.LoadFromStream(fs);
42                         Type type = assembly.GetExportedTypes().Where(t => t.GetInterfaces().Contains(typeof(ICommon))).FirstOrDefault();
43                         common = Activator.CreateInstance(type) as ICommon;
44                     }
45                     FileInfo fileInfo = new FileInfo(file);
46                     common.Invoke();
47                 }
48             }
49         }
50     }
51     public class Say : ICommon
52     {
53         public void Invoke()
54         {
55             Console.WriteLine($"{this.GetType()} Say Method ");
56         }
57     }
58 }

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 ");
        }
    }
}