1 using System;
 2 using System.Collections.Generic;
 3 using System.IO;
 4 using System.Reflection;
 5 using System.Runtime.Loader;
 6 
 7 namespace LoadDLL
 8 {
 9     /// <summary>
10     /// 程序集加载器
11     /// </summary>
12     public class AssemblyLoader
13     {
14         private string _basePath;
15         private AssemblyLoadContext context;
16 
17 
18         public AssemblyLoader(string basePath)
19         {
20             _basePath = basePath;
21         }
22 
23         public Type Load(string dllFileName, string typeName)
24         {
25                 context = new AssemblyLoadContext(dllFileName);
26                 context.Resolving += Context_Resolving;
27                 //需要绝对路径
28                 string path = Path.Combine(_basePath, dllFileName);
29                 if (File.Exists(path))
30                 {
31                     try
32                     {
33                         using (var stream = File.OpenRead(path))
34                         {
35                             Assembly assembly = context.LoadFromStream(stream);
36                             Type type = assembly.GetType(typeName);
37                             dicTypes.Add(typeName, type);
38                             return type;
39                         }
40                     }
41                     catch (Exception ex)
42                     {
43                         Console.WriteLine($"加载节点{dllFileName}-{typeName}发生异常：{ex.Message},{ex.StackTrace}");
44                     }
45 
46                 }
47                 else
48                 {
49                     Console.WriteLine($"节点动态库{dllFileName}不存在：{path}");
50                 }            
51             return null;
52         }
53 
54         /// <summary>
55         /// 加载依赖文件
56         /// </summary>
57         /// <param name="context"></param>
58         /// <param name="assemblyName"></param>
59         /// <returns></returns>
60         private Assembly Context_Resolving(AssemblyLoadContext context, AssemblyName assemblyName)
61         {
62             string expectedPath = Path.Combine(_basePath, assemblyName.Name + ".dll"); ;
63             if (File.Exists(expectedPath))
64             {
65                 try
66                 {
67                     using (var stream = File.OpenRead(expectedPath))
68                     {
69                         return context.LoadFromStream(stream);
70                     }
71                 }
72                 catch (Exception ex)
73                 {
74                     Console.WriteLine($"加载节点{expectedPath}发生异常：{ex.Message},{ex.StackTrace}");
75                 }
76             }
77             else
78             {
79                 Console.WriteLine($"依赖文件不存在：{expectedPath}");
80             }
81             return null;
82         }
83     }
84 }