[新增]第一版

你好插件/你好命令.cs

@@ -0,0 +1,21 @@
+using PluginBase;
+using System;
+using System.Runtime.InteropServices;
+
+namespace 你好插件
+{
+    public class 你好命令 : ICommand
+    {
+        public string 名称  { get => "你好"; }
+        public string 描述  { get => "显示一个你好的消息"; }
+
+        [DllImport("Kernel32.dll")]//引入命名空间        
+        public static extern bool Beep(int frequency, int duration);
+        public int 执行()
+        {
+            Console.WriteLine("你好 !!!\n");
+            Beep(700, 200);
+            return 0;
+        }
+    }
+}

你好插件/你好插件.csproj

@@ -0,0 +1,16 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <EnableDynamicLoading>true</EnableDynamicLoading>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\加载dll\加载dll.csproj">
+      <Private>False</Private>
+      <ExcludeAssets>runtime</ExcludeAssets>
+    </ProjectReference>
+  </ItemGroup>
+</Project>

加载dll.sln

@@ -3,7 +3,9 @@ Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio Version 17
 VisualStudioVersion = 17.4.33403.182
 MinimumVisualStudioVersion = 10.0.40219.1
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "加载dll", "加载dll\加载dll.csproj", "{4E443C0A-8E49-4186-9069-9946B033135E}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "加载dll", "加载dll\加载dll.csproj", "{4E443C0A-8E49-4186-9069-9946B033135E}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "你好插件", "你好插件\你好插件.csproj", "{748E79C2-35E6-4B25-890A-B88064B47705}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
@@ -15,6 +17,10 @@ Global
 		{4E443C0A-8E49-4186-9069-9946B033135E}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{4E443C0A-8E49-4186-9069-9946B033135E}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{4E443C0A-8E49-4186-9069-9946B033135E}.Release|Any CPU.Build.0 = Release|Any CPU
+		{748E79C2-35E6-4B25-890A-B88064B47705}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{748E79C2-35E6-4B25-890A-B88064B47705}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{748E79C2-35E6-4B25-890A-B88064B47705}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{748E79C2-35E6-4B25-890A-B88064B47705}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE

加载dll/PluginBase.cs

@@ -0,0 +1,16 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace PluginBase
+{
+    public interface ICommand
+    {
+        string 名称 { get; }//Name
+        string 描述 { get; }//Description
+
+        int 执行();
+    }
+}

加载dll/Program.cs

@@ -1,11 +1,118 @@
-namespace 加载dll
+using PluginBase;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Reflection;
+using 加载dll;
+
+namespace 加载Dll
 {
-    internal class Program
+    class Program
     {
         static void Main(string[] args)
         {
-            Console.WriteLine("Hello, World!");
+            try
+            {
+                if (args.Length == 1 && args[0] == "/d")
+                {
+                    Console.WriteLine("按下任何按钮开始运行...");
+                    Console.ReadLine();
+                }
+
+                // 从插件加载指令
+                string[] pluginPaths = new string[]
+                {
+                    "D:\\插件\\你好插件.dll",
+                    "C:\\Users\\misaka20001\\source\\repos\\加载dll\\你好插件\\bin\\Debug\\net6.0\\你好插件.dll"
+                    // Paths to plugins to load.
+                    // 这里填写需要加载插件的路径
+                };
+
+                IEnumerable<ICommand> commands = pluginPaths.SelectMany(pluginPath =>
+                {
+                    Assembly pluginAssembly = 加载插件(pluginPath);
+                    return 创建命令(pluginAssembly);
+                }).ToList();
+
+                if (args.Length == 0)
+                {
+                    Console.WriteLine("命令: ");
+                    // 输出加载的命令.
+                    foreach (ICommand command in commands)
+                    {
+                        Console.WriteLine($"{command.名称}\t - {command.描述}");
+                    }
+                }
+                else
+                {
+                    foreach (string commandName in args)
+                    {
+                        Console.WriteLine($"-- {commandName} --");
+
+                        // Execute the command with the name passed as an argument.
+                        // 使用作为参数传递的名称执行命令
+                        ICommand? command = commands.FirstOrDefault(c => c.名称 == commandName);
+                        if (command == null)
+                        {
+                            Console.WriteLine("没有找到任何已知命令");
+                            return;
+                        }
+
+                        command.执行();
+
+                        Console.WriteLine();
+                    }
+                }
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine(ex);
+            }
+        }
+
+        static Assembly 加载插件(string 相对路径)
+        {
+            //throw new NotImplementedException();//未实现异常
+            string? root = Path.GetFullPath(Path.Combine(
+       Path.GetDirectoryName(
+           Path.GetDirectoryName(
+               Path.GetDirectoryName(
+                   Path.GetDirectoryName(
+                       Path.GetDirectoryName(path:typeof(Program).Assembly.Location)))))));
+
+            string pluginLocation = Path.GetFullPath(Path.Combine(root, 相对路径.Replace('\\', Path.DirectorySeparatorChar)));
+            Console.WriteLine($"加载插件: {pluginLocation}");
+            加载插件上下文 loadContext = new 加载插件上下文(pluginLocation);
+            return loadContext.LoadFromAssemblyName(new AssemblyName(Path.GetFileNameWithoutExtension(pluginLocation)));
+        }
+
+        static IEnumerable<ICommand> 创建命令(Assembly 程序集)
+        {
+            int count = 0;
+
+            foreach (Type type in 程序集.GetTypes())
+            {
+                if (typeof(ICommand).IsAssignableFrom(type))
+                {
+                    ICommand result = Activator.CreateInstance(type) as ICommand;
+                    if (result != null)
+                    {
+                        count++;
+                        yield return result;
+                    }
+                }
+            }
+
+            if (count == 0)
+            {
+                string availableTypes = string.Join(",", 程序集.GetTypes().Select(t => t.FullName));
+                throw new ApplicationException(
+                    $"在{程序集.Location}的{程序集}中找不到实现了ICommand的任何可用类型\n"+
+                    $"可用类型: {availableTypes}");
+            }
+        }
+
 
     }
 }
-}

加载dll/加载插件上下文.cs

@@ -0,0 +1,61 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Reflection;
+using System.Runtime.Loader;
+using System.Text;
+using System.Threading.Tasks;
+using 加载Dll;
+
+namespace 加载dll
+{
+
+        class 加载插件上下文 : AssemblyLoadContext
+        {
+            private AssemblyDependencyResolver? _解析器;
+
+            public 加载插件上下文(string 插件路径)
+            {
+                _解析器 = new AssemblyDependencyResolver(插件路径);
+            }
+
+            protected override Assembly? Load(AssemblyName 程序集名称)
+            {
+                string? 程序集路径 = _解析器?.ResolveAssemblyToPath(程序集名称);
+                if (程序集路径 != null)
+                {
+                    return LoadFromAssemblyPath(程序集路径);//从路径加载程序集
+                }
+
+                return null;
+            }
+
+            protected override IntPtr LoadUnmanagedDll(string 非托管DLL名称)//重写加载非托管DLL方法
+            {
+                string? libraryPath = _解析器?.ResolveUnmanagedDllToPath(非托管DLL名称);//解析非托管类型DLL为路径
+                if (libraryPath != null)
+                {
+                    return LoadUnmanagedDllFromPath(libraryPath);//从路径加载程序集
+                }
+
+                return IntPtr.Zero;
+            }
+
+        static Assembly LoadPlugin(string relativePath)
+        {
+            // Navigate up to the solution root
+            string root = Path.GetFullPath(Path.Combine(
+                Path.GetDirectoryName(
+                    Path.GetDirectoryName(
+                        Path.GetDirectoryName(
+                            Path.GetDirectoryName(
+                                Path.GetDirectoryName(typeof(Program).Assembly.Location)))))));
+
+            string pluginLocation = Path.GetFullPath(Path.Combine(root, relativePath.Replace('\\', Path.DirectorySeparatorChar)));
+            Console.WriteLine($"Loading commands from: {pluginLocation}");
+            加载插件上下文 loadContext = new 加载插件上下文(pluginLocation);
+            return loadContext.LoadFromAssemblyName(new AssemblyName(Path.GetFileNameWithoutExtension(pluginLocation)));
+        }
+    }
+    
+}