原创 1.如何创建插件树

CoreStartup的RunInitialization调用AddInTree.Load方法，加载Addins，并执行/Workspace/Autostart节点下的Addin的Command
 加
载Addins时，XmlReader解析.addin文件，调用了AddIn.Load，AddIn.SetupAddIn，根据xml元素是
Runtime，Include，Path，Manifest等，分别解析，填充到AddIn对象 例如Path，调用
ExtensionPath.SetUp方法(递归)，会解析并创建下层所有Codon对象，添加到ExtensionPath对象中。
 AddInTree.Load
方法调用AddInTree.InsertAddIn方法添加每一个AddIn到插件树中：对AddIn中的每一个Path，首先创建
AddInTreeNode，然后把之前解析存放在ExtensionPath中的Codon列表拷贝到AddInTreeNode对象，
 这样，整个插件数就创建起来了。

2.如何获得插件实例
 调用AddInTree.BuildItem(一个Codon)/BuildItems(AddInNode下所有Codon)方法。
 BuildItem方法首先分析出AddInTreeNode，创建出这个节点下的Codon对象，再根据Codon的id查找需要的插件实例。
 AddInTree.BuildItems -> AddInTreeNode.BuildChildItems(递归) -> Codon.BuildItem -> IDoozer.BuildItem
 实例化的Codon存放在什么地方？

3.Doozer,Codon,addin
 Doozer提供实例化Codon的方法，Codon与Doozer的关系相当于Object与Class的关系。SD中所有的资源包括Menu,Toolbar,Icon,String,Pad,Dialog等都可在.addin中描述,用对应的Doozer实例化。

4.Service
 提供功一些通用的操作,是static或Singleton的，它在各个addin之间起到的粘合的作用
 MenuService提供了从Addin树创建菜单的功能，
 ToolBarService提供了从Addin树创建工具栏的功能，
 LoggingService调用log4net记录日志
 FileUtility提供通用的文件操作
 PropertyService提供全局属性关系，包括属性的持久化
 ResourceService提供资源的管理
 MessageService显示消息给用户

5.ICSharpCode.SharpDevelop工程
 位于Main/Base目录，是应用程序的基础Addin，Core工程提供的组织插件的方法，SharpDevelop也只是在Core之上的一个插件。但它提供了一些基本的功能供其余插件使用。
 SharpDevelop提供了控制应用程序主窗口的代码，提供了主要功能的接口，例如：管理，撤销/重做，pad(可停靠的面板)

6.初始化过程
 [StartUp]->(SharpDevelopMain.cs).RunApplication
   创建并设置StartupSettings，SharpDevelopHost，WorkbenchSettings，调用SharpDevelopHost.RunWorkbench
   在
SharpDevelopHost的构造函数中，调用CallHelper.InitSharpDevelopCore方法初始化Core(调用了
Core工程中的CoreStartup的StartCoreServices和RunInitialization方法，创建Addin树)
 [SharpDevelop.Sda]->(SharpDevelopHost.cs).RunWorkbench
   创建新的AppDomain,让Workbench在这里面运行，为什么这么做？
 [SharpDevelop.Sda]->(CallHelper.cs).RunWorkbench
   决定是否创建新的线程，让workbench在新线程中运行
 [SharpDevelop.Sda]->(CallHelper.cs).RunWorkbenchInternal
   调用WorkbenchSingleton.InitializeWorkbench()，创建主界面DefaultWorkbench，调用DefaultWorkbench.InitializeWorkspace初始化主界面，初始化各种服务
   触发CallHelper的BeforeRunWorkbench事件；
   主界面退出后，触发CallHelper的WorkbenchClosed事件；
 [SharpDevelop]->(Commands/AutostartCommands.cs).Run
 Application.Run(WorkbenchSingleton.MainForm)
   WorkbenchSingleton是单例模式的，包含DefaultWorkbench，是主界面

7.使用Core的例子

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 主函数:

   // The LoggingService is a small wrapper around log4net.
   // Our application contains a .config file telling log4net to write
   // to System.Diagnostics.Trace.
   LoggingService.Info("Application start");
   
   // Get a reference to the entry assembly (Startup.exe)
   Assembly exe = typeof(Program).Assembly;
   
   // Set the root path of our application. ICSharpCode.Core looks for some other
   // paths relative to the application root:
   // "data/resources" for language resources, "data/options" for default options
   FileUtility.ApplicationRootPath = Path.GetDirectoryName(exe.Location);
   
   LoggingService.Info("Starting core services...");
   
   // CoreStartup is a helper class making starting the Core easier.
   // The parameter is used as the application name, e.g. for the default title of
   // MessageService.ShowMessage() calls.
   CoreStartup coreStartup = new CoreStartup("Test application");
   // It is also used as default storage location for the application settings:
   // "%Application Data%\%Application Name%", but you can override that by setting c.ConfigDirectory
   
   // Specify the name of the application settings file (.xml is automatically appended)
   coreStartup.PropertiesName = "AppProperties";
   
   // Initializes the Core services (ResourceService, PropertyService, etc.)
   coreStartup.StartCoreServices();
   
   // Registeres the default (English) strings and images. They are compiled as
   // "EmbeddedResource" into Startup.exe.
   // Localized strings are automatically picked up when they are put into the
   // "data/resources" directory.
   ResourceService.RegisterNeutralStrings(new ResourceManager("Startup.StringResources", exe));
   ResourceService.RegisterNeutralImages(new ResourceManager("Startup.ImageResources", exe));
   
   LoggingService.Info("Looking for AddIns...");
   // Searches for ".addin" files in the application directory.
   coreStartup.AddAddInsFromDirectory(Path.Combine(FileUtility.ApplicationRootPath, "AddIns"));
   
   // Searches for a "AddIns.xml" in the user profile that specifies the names of the
   // add-ins that were deactivated by the user, and adds "external" AddIns.
   coreStartup.ConfigureExternalAddIns(Path.Combine(PropertyService.ConfigDirectory, "AddIns.xml"));
   
   // Searches for add-ins installed by the user into his profile directory. This also
   // performs the job of installing, uninstalling or upgrading add-ins if the user
   // requested it the last time this application was running.
   coreStartup.ConfigureUserAddIns(Path.Combine(PropertyService.ConfigDirectory, "AddInInstallTemp"),
                                   Path.Combine(PropertyService.ConfigDirectory, "AddIns"));
   
   LoggingService.Info("Loading AddInTree...");
   // Now finally initialize the application. This parses the ".addin" files and
   // creates the AddIn tree. It also automatically runs the commands in
   // "/Workspace/Autostart"
   coreStartup.RunInitialization();
   
   LoggingService.Info("Initializing Workbench...");
   // Workbench is our class from the base project, this method creates an instance
   // of the main form.
   Workbench.InitializeWorkbench();
   
   try {
    LoggingService.Info("Running application...");
    // Workbench.Instance is the instance of the main form, run the message loop.
                Application.Run(Workbench.Instance);
   } finally {
    try {
     // Save changed properties
     PropertyService.Save();
    } catch (Exception ex) {
     MessageService.ShowError(ex, "Error storing properties");
    }
   }
   
   LoggingService.Info("Application shutdown");

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 主界面:
 
 public partial class Workbench : Form
    {
        static Workbench instance;

        public static Workbench Instance
        {
            get
            {
                return instance;
            }
        }

        public static void InitializeWorkbench()
        {
            instance = new Workbench();
        }

        MenuStrip menu;
        ToolStrip toolbar;
        Panel contentPanel;

        private Workbench()
  {
   //
   // The InitializeComponent() call is required for Windows Forms designer support.
   //
   InitializeComponent();
   
   //
   // TODO: Add constructor code after the InitializeComponent() call.
   //
            contentPanel = new Panel();
            contentPanel.Dock = DockStyle.Fill;
            this.Controls.Add(contentPanel);

            menu = new MenuStrip();
            MenuService.AddItemsToMenu(menu.Items, this, "/Workbench/MainMenu");

            toolbar = ToolbarService.CreateToolStrip(this, "/Workbench/Toolbar");

            this.Controls.Add(toolbar);
            this.Controls.Add(menu);
  }
 }