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  • 构建可扩展程序

    简要说明:可扩展程序包括三个部分,第一部分是个接口程序,包含IAppFunctionality接口,所有扩展都要实现该接口,第二部分是扩展,实现IAppFunctionality,第三部分是主程序,它检测与它同级目录下是否有plugins文件夹,如果没有,就创建,如果有,查找该目录下所有实现IAppFunctionality接口的程序集,并更新菜单。
     
    未添加扩展(即plugins下无dll程序)的运行情况

    未安装插件的效果

    安装插件之后

    安装了插件后菜单发生了变化

    点击Plugin1和Plugin2:

    程序源码:

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    //AuthorInfoAttribute.cs
    using System;
     
    namespace PluginBase
    {
        public interface IAppFunctionality
        {
            void ShowInfo();
        }
     
        [AttributeUsage(AttributeTargets.Class)]
        public class AuthorInfoAttribute : System.Attribute
        {
            public string Email { get; set; }
            public string Name { get; set; }
        }
    }
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    //Plugin1.cs
    using System.Windows.Forms;
    using PluginBase;
     
    namespace Plugin1
    {
        [AuthorInfoAttribute(Name="liulixiang", Email="liulixiang1988@gmail.com")]
        public class Plugin1: IAppFunctionality
        {
            public void ShowInfo()
            {
                MessageBox.Show("Hello world, 你懂的。");
            }
        }
    }
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    //Plugin2.cs
    using System.Windows.Forms;
    using PluginBase;
     
    namespace Plugin2
    {
        [AuthorInfoAttribute(Name="liulixiang", Email="liulixiang1988@gmail.com")]
        public class Plugin2:IAppFunctionality
        {
            public void ShowInfo()
            {
                MessageBox.Show("打酱油~~~");
            }
        }
    }
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    //MainApp.cs
    using System;
    using System.Collections.Generic;
    using System.IO;
    using System.Linq;
    using System.Reflection;
    using System.Windows.Forms;
    using PluginBase;
     
    namespace MyExtendableApp
    {
        public partial class MainApp : Form
        {
            private string pluginDir = "plugins\\";
            private List<PluginBase.IAppFunctionality> apps = new List<PluginBase.IAppFunctionality>();
            public MainApp()
            {
                InitializeComponent();
                LoadPlugins();
            }
     
            private void LoadPlugins()
            {
                if (!Directory.Exists(pluginDir))
                {
                    // 如果扩展程序文件夹不存在,就创建它
                    Directory.CreateDirectory(pluginDir);
                }
     
                try
                {
    	            var plugins = from plugin in Directory.EnumerateFiles(pluginDir, "*.dll")
    	                          select plugin;
    	            foreach (string plugin in plugins)
    	            {
                        Assembly thePluginAsm = null;
                         thePluginAsm = Assembly.LoadFrom(plugin);
     
                        //获取所有实现扩展接口的程序集
                         var theClassTypes = from t in thePluginAsm.GetTypes()
                                            where t.IsClass && (t.GetInterface("IAppFunctionality") != null)
                                            select t;
     
                        //调用接口方法
                        foreach (Type t in theClassTypes)
                        {
                            IAppFunctionality itfApp = (IAppFunctionality)thePluginAsm.CreateInstance(t.FullName, true);
                            apps.Add(itfApp);
                            ToolStripMenuItem menuItem = new ToolStripMenuItem(t.Name);
                            menuItem.Click += new System.EventHandler(delegate(object o, EventArgs e)
                                {
                                    itfApp.ShowInfo();
                                });
                            menuStrip1.Items.Add(menuItem);
                          //  itfApp.ShowInfo();
                        }
    	            }
     
     
                }
                catch (System.Exception ex)
                {
                    MessageBox.Show(ex.Message);
                }
            }
        }
    }
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  • 原文地址:https://www.cnblogs.com/liulixiang/p/2067729.html
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