关于插件系统的demo

        前一段看了看Sharepdevlop的源代码。里边的插件树给了我写程序的启发。于是就想写一个自己的插件管理。
　　下边是我的程序贴图

主要做的是功能的动态加载。可以单独开发每个功能。只要将其类写在配置文件中即可。配置文件如下：

<?xml version="1.0" encoding="utf-8" ?>
<class dll ="AddIn\EditAddin\EditMenu.dll">
  <menuitem name ="editmenuitem" path ="" text="编辑" classname ="EditMenu.EditMenu" />
  <menuitem name ="selectallmenuitem" path ="editmenuitem" text="全选" classname ="EditMenu.SelectAll" />
  <menuitem name ="copymenuitem" path ="editmenuitem" text="复制" classname ="EditMenu.Copy" />
  <menuitem name ="cutmenuitem" path ="editmenuitem" text="剪切" classname ="EditMenu.Cut" />
  <menuitem name ="pastemenuitem" path ="editmenuitem" text="粘贴" classname ="EditMenu.Paste" />
</class>

这是编辑菜单的配置文件
name是对应的菜单内部名子。path对应的是要插入到那个菜单的下边，如果是空则为最上级菜单。text是程序中显示的名子,classname是该功能菜单所对应的类。
然后定义一个通一的结口。用以实现在主程序中的调用

using System;
using System.Collections.Generic;
using System.Text;

namespace MainCommand
{
    public interface ICommand
    {
        void Run();
    }
    public interface IMenuCommand:ICommand
    {       
        void CheckItem(object sender, EventArgs e);
    }
    public interface IMenuCheckCommand : IMenuCommand
    {
        bool Check
        {
            get;
            set;
        }
        bool Endable
        {
            get;
            set;
        }
    }
}

下边代码是加载插件。

using System;
using System.Collections.Generic;
using System.Text;
using System.Xml;
using System.IO;
using System.Windows.Forms;
using System.Reflection;
using MainCommand;

namespace MenuManage
{
    //和配置文件中的属性对应
    public class AddInXmlMenuItem
    {
        /**//// <summary>
        /// 
        /// </summary>
        public string menuname;
        public string menutext;
        public string menupath;
        public string classname;
    }
    public class AddInXmlmenu
    {
        /**//// <summary>
        /// 用来载入动态库
        /// </summary>
        Assembly loadedAssembly = null;
        /**//// <summary>
        /// 存存配置信息
        /// </summary>
        public List<AddInXmlMenuItem> AddInXmlList = new List<AddInXmlMenuItem>();
        public List<IMenuCommand> MenuCommandList = new List<IMenuCommand>();
        /**//// <summary>
        /// 动态库的路径
        /// </summary>
        public string classdll;
        /**//// <summary>
        /// 装载配置文件
        /// </summary>
        /// <param name="xmlname"></param>
        public void LoadAddInXml(string xmlname)
        {
            XmlDocument document = new XmlDocument();
            document.XmlResolver = null;
            document.Load(xmlname);
            for (int i = 0; i < document.ChildNodes.Count; i++)
            {
                XmlNode firstnode = document.ChildNodes[i];
                if (firstnode.Name.Equals("class"))
                {
                    classdll = firstnode.Attributes["dll"].Value;

                    loadedAssembly = Assembly.LoadFrom(classdll);

                    for (int j = 0; j < firstnode.ChildNodes.Count; j++)
                    {
                        XmlNode menunode = firstnode.ChildNodes[j];
                        switch (menunode.Name)
                        {
                            case "menuitem":
                                {
                                    AddInXmlMenuItem item = new AddInXmlMenuItem();
                                    item.classname = menunode.Attributes["classname"].Value;
                                    item.menuname = menunode.Attributes["name"].Value;
                                    item.menupath = menunode.Attributes["path"].Value;
                                    item.menutext = menunode.Attributes["text"].Value;

                                    IMenuCommand command = loadedAssembly.CreateInstance(item.classname) as IMenuCommand;
                                    AddInXmlList.Add(item);
                                    MenuCommandList.Add(command);
                                }
                                break;
                            default:
                                break;
                        }                     
                        
                    }
                }                
            }
        }
        
    }
    static class AddInClass
    {
        public static MenuStrip MenuObject;
        static public List<AddInXmlmenu> AddInXml = new List<AddInXmlmenu>();        
        /**//// <summary>
        /// 初始化插件
        /// </summary>
        static public void InitAddInClass()
        {
            //读取插件
            string[] straddin = Directory.GetDirectories("AddIn");
            for (int i = 0; i < straddin.Length; i++)
            {
                string pathstr = straddin[i];
                string[] filename = Directory.GetFiles(pathstr);
                for (int j = 0; j < filename.Length; j++)
                {
                    string exte = Path.GetExtension(filename[j]);
                    if (exte.Equals(".AddIn"))
                    {
                        AddInXmlmenu tempxmlmenu = new AddInXmlmenu();
                        tempxmlmenu.LoadAddInXml(filename[j]);
                        if (tempxmlmenu.AddInXmlList.Count > 0)
                        {
                            AddInXml.Add(tempxmlmenu);
                        }
                    }
                }
            }
        }
        /**//// <summary>
        /// 增加菜单
        /// </summary>
        static public void AddMenuItem()
        {            
            for (int i = 0; i < AddInXml.Count; i++)
            {
                AddInXmlmenu itemmenu = AddInXml[i];
                for (int j = 0; j < itemmenu.AddInXmlList.Count; j++)
                {
                    AddInXmlMenuItem item = itemmenu.AddInXmlList[j];
                    ToolStripMenuItem  toolitem = CreateMenuItem(item.menuname, item.menutext, item.menupath);
                    if (toolitem == null)
                    {
                        continue;
                    }
                    IMenuCommand command = itemmenu.MenuCommandList[j] as IMenuCommand;
                    command.Run();
                    toolitem.Click +=new EventHandler(command.CheckItem);
                }
            }            
        }
        /**//// <summary>
        /// 建立菜单项目
        /// </summary>
        /// <param name="name"></param>
        /// <param name="text"></param>
        /// <param name="menu"></param>
        static private ToolStripMenuItem CreateMenuItem(string name, string text, string menu)
        {
            if (MenuObject != null)
            {
                ToolStripMenuItem item = new ToolStripMenuItem();
                item.Name = name;
                item.Text = text;
                if (menu == "")
                {
                    MenuObject.Items.Add(item);
                }
                else
                {
                    ToolStripMenuItem parent = GetToolItem(menu);
                    if (parent != null)
                    {
                        parent.DropDownItems.Add(item);
                    }
                }
                
                return item;
            }
            return null;
        }
        /**//// <summary>
        /// 得到要插入的菜单项
        /// </summary>
        /// <param name="itempath"></param>
        /// <returns></returns>
        static private ToolStripMenuItem GetToolItem(string itempath)
        {

            string[] word = itempath.Split('\\');
            ToolStripMenuItem item = MenuObject.Items[word[0]] as ToolStripMenuItem;
            if (item != null)
            {
                for (int i = 1; i < word.Length; i++)
                {
                    if (word[i].Length > 0)
                    {
                        item = item.DropDownItems[word[i]] as ToolStripMenuItem;
                    }
                }
            }
            else
            {
                return null;
            }

            return item;
        }
    }
}

 以下是源代码地址:https://files.cnblogs.com/xtpgkxk/插件管理.rar