WPF使用MEF插件开发打造自己的工具箱

namespace Plugin.Base
{
    public interface IPlugin
    {
        //主程序调用此方法,启动插件
        void Startup(object args = null);
        //主程序调用此方法,退出插件
        void Close(object args = null);
        //插件名,用于主程序中获取并显示
        string PluginName { get; }
        //插件唯一Key,用于区分插件,(后期做下载更新插件的时候会用到,现在没啥用)
        Guid PluginKey { get; }
        //插件的图标,用于主程序中获取并显示
        ImageSource PluginIcon { get; }
        //插件的启动Command,用于Wpf程序中绑定使用
        System.Windows.Input.ICommand StartupCommand { get; }
        //插件的关闭Command,用于Wpf程序中绑定使用
        System.Windows.Input.ICommand CloseCommand { get; }
        //插件的描述,用于主程序中获取并显示
        string PluginDescription { get; }
        //忘记了为啥,当时写的时候,加上了这个属性,现在想不起来了,算了,先放这吧,不用管它
        bool LoadSucceed { get; set; }
        //是否支持自启动.想着后期工具箱要做开机自启的.工具箱启动后,又能自动启动这些设置了自启的插件
        bool SupportAutoStartup { get; set; }
        //插件被加载手,主程序调用此方法,初始化插件
        void Initialize();
    }
}

using Plugin.Base;
using System;
using System.Collections.Generic;
using System.ComponentModel.Composition;
using System.ComponentModel.Composition.Hosting;
using System.Linq;
using ViewModel.Base;
namespace Tools
{
    public class PluginLoader
    {
      //些特性表示加载实现了Iplugin接口的类
        [ImportMany(typeof(IPlugin))]
        private IEnumerable<IPlugin> Plugins { get; set; }
        public PluginLoader()
        {
            //这个下载插件的的功能,还没有做好,先把事件写了,放在这,先不用管,后面会再讲解
            Global.OnPluginDownLoadSucceed += OnPluginDownLoadSucceed;
        }
        //插件下载成功事件,下载后加载插件,按照插件的PluginKey加载(不懂的看上面的Iplugin接口)
        private void OnPluginDownLoadSucceed(string guid)
        {
            try
            {
                AggregateCatalog catalog = new AggregateCatalog();
                //设置插件目录为程序目录,插件名称为Tools.Plugin.{guid}.dll
                //这是我们的定义的规定,后面开发的插件,dll名字都要是这样的
                //没有规矩不成方圆
                catalog.Catalogs.Add(new DirectoryCatalog(".", $"Tools.Plugin.{guid}.dll"));
                //加载插件
                using (CompositionContainer container = new CompositionContainer(catalog))
                {
                    container.ComposeParts(this);
                    foreach (var plugin in Plugins)
                    {
                        //初始化插件
                        plugin.Initialize();
                        //存到主程序中,后面调用使用
                        Global.Plugins.Add(plugin);
                    }
                }
                //我们添加的更多插件,这是一个默认插件,想着搞个官网装下B呢嘿嘿
                var more = Global.Plugins.FirstOrDefault(r => r.PluginKey == Global.MorePluginKey);
                if (more != null)
                {
                    Global.Plugins.Remove(more);
                    Global.Plugins.Add(more);
                }
            }
            catch (Exception ex)
            {
                Log.File(ex, "加载插件异常");
            }
        }
        //主程序启动后,调用此方法,可加载目录中所有插件
        public void Load()
        {
            try
            {
                AggregateCatalog catalog = new AggregateCatalog();
                //设置插件目录为程序目录,插件名称为Tools.Plugin.*.dll
                catalog.Catalogs.Add(new DirectoryCatalog(".", "Tools.Plugin.*"));
                using (CompositionContainer container = new CompositionContainer(catalog))
                {
                    container.ComposeParts(this);
                    foreach (var plugin in Plugins)
                    {
                        plugin.Initialize();
                        Global.Plugins.Add(plugin);
                    }
                }
                var more = Global.Plugins.FirstOrDefault(r => r.PluginKey == Global.MorePluginKey);
                if (more != null)
                {
                    Global.Plugins.Remove(more);
                    Global.Plugins.Add(more);
                }
            }
            catch (Exception ex)
            {
                Log.File(ex, "加载插件异常");
            }
        }
    }
}

using Plugin.Base;
using System;
using System.ComponentModel.Composition;
using System.Windows.Input;
using System.Windows.Media;
using ViewModel.Base;

namespace Tools.Plugin.More
{
    //务必使用此特性,向外公开IPlugin类型
    //实现IPlugin
    [Export(typeof(IPlugin))]
    public class Plugin : IPlugin
    {
        public string PluginName => "更多精彩";

        public Guid PluginKey => new Guid("be8ff5b2-733e-4b76-a9c2-f7ec57ee6d18");
        //这里提供一个图片,作为主程序显示插件的图标用,这个还要转一下类型,唉,当时设计失误,算了,不想改了
        public ImageSource PluginIcon => ImageHelper.BitmapToBitmapImage(Properties.Resources.More64);

        public string PluginDescription => "打开官网查看更多";
        public ICommand StartupCommand { get; private set; }
        public ICommand CloseCommand { get; private set; }
        public bool LoadSucceed
        {
            get => true;
            set
            {
                throw new NotSupportedException($"本插件不支持修改此属性:{nameof(LoadSucceed)}");
            }
        }

        public bool SupportAutoStartup { get => false; set { } }
        public void Initialize()
        {
            StartupCommand = new RelayParameterizedCommand((args) => Startup(args));
            CloseCommand = new RelayParameterizedCommand((args) => Close(args));
        }
       
        public void Startup(object args = null)
        {
            System.Diagnostics.Process.Start("https://www.gggcloud.top");
        }
        public void Close(object args = null)
        {
        }
    }
}