1、在程序运行的同时将插件文件复制到指定的插件目录下，插件自动被加载。不废话了直接上代码吧。需要的可以帮我贡献点积分，谢谢各位大佬了。

示例文件下载https://download.csdn.net/download/xingchengaiwei/896388912、主要功能代码如下。注意初学者建议 查看示例文件下载。

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using AbstractionLayer;
using Path = System.IO.Path;

namespace WPFIPluginDemo
{
    /// <summary>
    /// MainWindow.xaml 的交互逻辑
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            //开始监控指定文件
            StartMonitoring(GetCurrentProgramPath() + "\\Plugins");
            //加载已存在的插件
            LoadPlugins(GetCurrentProgramPath() + "\\Plugins");
        }
        /// <summary>
        /// 文件监视
        /// </summary>
        private FileSystemWatcher _fileWatcher;
        /// <summary>
        /// 开始监视文件夹
        /// </summary>
        /// <param name="directoryPath"></param>
        private void StartMonitoring(string directoryPath)
        {
            // 创建 FileSystemWatcher 实例
            _fileWatcher = new FileSystemWatcher();

            // 设置要监视的目录路径
            _fileWatcher.Path = directoryPath;

            // 设置要监视的更改类型（例如：修改、创建、删除）
            _fileWatcher.NotifyFilter = NotifyFilters.LastWrite | NotifyFilters.FileName | NotifyFilters.DirectoryName;

            // 添加事件处理程序
            _fileWatcher.Changed += OnChanged;
            _fileWatcher.Created += OnChanged;
            _fileWatcher.Deleted += OnChanged;

            // 开启事件监听
            _fileWatcher.EnableRaisingEvents = true;

            Debug.WriteLine($"已开始监视文件夹: {directoryPath}");
        }
        /// <summary>
        /// 当文件夹中内容发生改变时触发时间
        /// </summary>
        /// <param name="source"></param>
        /// <param name="e"></param>
        private void OnChanged(object source, FileSystemEventArgs e)
        {
            //Debug.WriteLine($"文件或文件夹发生变更: {e.FullPath}，事件类型: {e.ChangeType}");
            if ((e.ChangeType & WatcherChangeTypes.Created) != 0)
            {
                if (File.Exists(e.FullPath))
                {
                    Debug.WriteLine("创建了文件");
                    LoadPlugins(GetCurrentProgramPath() + "\\Plugins");
                    Debug.WriteLine($"文件或文件夹发生变更: {e.FullPath}，事件类型: {e.ChangeType}");

                }
                else
                {
                    Debug.WriteLine("创建了文件夹");
                }
            }
        }

        private bool IsDirectory(string path)
        {
            try
            {
                FileAttributes attr = File.GetAttributes(path);

                if ((attr & FileAttributes.Directory) ==FileAttributes.Directory)
                {
                    return true;
                }
                else
                {
                    return false;
                }
            }
            catch (Exception e)
            {
                return false;
            }
        }
        /// <summary>
        /// 停止监视文件夹
        /// </summary>
        public void StopMonitoring()
        {
            if (_fileWatcher != null)
            {
                // 停止引发事件
                _fileWatcher.EnableRaisingEvents = false;

                // 清理资源
                _fileWatcher.Dispose();
                _fileWatcher = null;

                Debug.WriteLine("已停止监视文件夹");
            }
        }
        /// <summary>
        /// 点击加载插件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void BtnSearchPlugins_OnClick(object sender, RoutedEventArgs e)
        {
            LoadPlugins(GetCurrentProgramPath()+"\\Plugins");
        }
        /// <summary>
        /// 获取当前程序集的路径
        /// </summary>
        /// <returns></returns>
        public static string GetCurrentProgramPath()
        {
            // 获取当前执行的程序集
            var assembly = Assembly.GetEntryAssembly();

            // 获取程序集所在的路径
            var assemblyLocation = assembly.Location;

            // 获取程序集所在的目录
            var programPath = Path.GetDirectoryName(assemblyLocation);

            return programPath;
        }
        /// <summary>
        /// 插件列表
        /// </summary>
        public List<IPlugin> ListIPlugins = new List<IPlugin>();
        /// <summary>
        /// 加载指定插件
        /// </summary>
        /// <param name="pluginDirectory"></param>
        public void LoadPlugins(string pluginDirectory)
        {
            try
            {
                Dispatcher.BeginInvoke(new Action(delegate
                {
                    // 获取所有插件DLL
                    var pluginDlls = Directory.GetFiles(pluginDirectory, "*.exe", SearchOption.TopDirectoryOnly);

                    foreach (var dll in pluginDlls)
                    {
                        try
                        {

                            Assembly pluginAssembly = Assembly.LoadFrom(dll);

                            // 查找实现了IPlugin接口的类型
                            var pluginTypes = pluginAssembly.GetTypes().Where(t => typeof(IPlugin).IsAssignableFrom(t) && !t.IsInterface);

                            foreach (var pluginType in pluginTypes)
                            {
                                IPlugin plugin = (IPlugin)Activator.CreateInstance(pluginType);
                                plugin.Initialize();
                                // 管理插件的代码
                                ListIPlugins.Add(plugin);
                            }
                        }
                        catch (Exception e)
                        {
                            Debug.WriteLine(e);

                            //throw;
                        }
                    }

                }));

            }
            catch (Exception e)
            {
                Debug.WriteLine(e);
                //throw;
            }

        }
        /// <summary>
        /// 调用插件中的方法
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void BtnShowPlugin_OnClick(object sender, RoutedEventArgs e)
        {
            Type plugin = ListIPlugins[0].GetType();

            MethodInfo showInfo = plugin.GetMethod("Show");//得到dll文件的中的方法

            showInfo.Invoke(ListIPlugins[0], null);//方法调用
        }
    }
}