RFID会议签到系统总结（十八）――菜单与工具栏的加载
经过上二篇的铺垫，现在终于可以加载菜单与工具栏了。先来看一下IService的接口实现里LoadCommand方法是如何来加载菜单与工具栏的：
IService接口的实现
public class SignInRunner: IService 
{
…… …… private MenuCfg menus; private ToolBarCfg toolbars; //…… //…… public SignInRunner ()
{ //…… //…… string cfgPath = Assembly.GetExecutingAssembly().Location + ".config"; ConfigReader reader = new ConfigReader(cfgPath); menus = reader.GetConfig("Menu") as MenuCfg; toolbars = reader.GetConfig("ToolBar") as ToolBarCfg;
} IService 成员#region IService 成员 // …… public void LoadCommand() { try { if (menus == null || menus.Items.Count == 0) return; CommandMenu[] cmdMenu = CommandUtility.GetMenus(menus.Items,Context.OwnerPanel); Context.OwnerMenu.MenuItems.AddRange(cmdMenu); if (toolbars == null || toolbars.Items.Count == 0) return; ToolBarButton sp = new ToolBarButton(); sp.Style = ToolBarButtonStyle.Separator; Context.OwnerTool.Buttons.Add(sp); Context.OwnerTool.Buttons.AddRange(CommandUtility.GetButtons(toolbars.Items,cmdMenu,Context.OwnerTool.ImageList)); } catch(Exception e) { logNet.Error("加载[" + Name + "]的菜单与工具栏时出错--" + e.Message); } } //…… //…… //…… #endregion
}上述第一步先从模块的配置文件里读取到菜单与工具栏，得到相应的配置类；再把配置类转化为上二篇的带Command模式的菜单项（或工具栏按钮）类的数组；最后把数组加入到主窗体的菜单项集合（或工具栏按钮集合）中。
那如何把配置类转为菜单项（或工具栏按钮）类数组的呢？其实那个配置类本身也就是一个层层叠加的集合，每一项的属性跟菜单项（或工具栏按钮）的属性有对应，转化过程就是层层属性转化的过程，唯一另外要做的一件事就是把相应的单击事件附加上去。
具体过程见下面代码：
从配置到菜单（工具栏） public sealed class CommandUtility { private const string ICONPATH = "Icons"; private static EventHandler evh; private static log4net.ILog logNet; private static void CommandClick(object sender,System.EventArgs e) { ICommand cmd = (sender as ICommandHolder).GetCommand(); cmd.Execute(); } static CommandUtility() { evh = new EventHandler(CommandClick); logNet = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType); } /**//// <summary> /// 根据配置文件菜单列表得到实际菜单数组 /// </summary> /// <param name="itemList"></param> /// <param name="panel"></param> /// <returns></returns> public static CommandMenu[] GetMenus(MenuItemList itemList,WeifenLuo.WinFormsUI.DockPanel panel){ int length = itemList.Count; CommandMenu[] ret = new CommandMenu[length]; MenuItemCfg item; ICommand command; for (int i = 0;i < length;i++){ item = itemList[i]; if (item.Key != null && item.Key.Length > 0) ret[i] = new CommandMenu(item.Caption + "(&" + item.Key + ")"); else ret[i] = new CommandMenu(item.Caption); ret[i].ID = item.ID; ret[i].Enabled = !item.Disable; if (item.Form != null && item.Form.Length > 0) { if (item.Method != null && item.Method.Length > 0) command = new ExecuteCommand(item.ID,item.Form,panel.FindForm(),item.Method); else command = new ShowFormCommand(item.ID,item.Form,panel,item.IsModal); ret[i].SetCommand(command); ret[i].Click += evh; } if (item.Items.Count > 0){ ret[i].MenuItems.AddRange(GetMenus(item.Items,panel)); } } return ret; } /**//// <summary> /// 根据配置文件工具栏按钮列表得到实际按钮数组 /// </summary> /// <param name="itemList"></param> /// <param name="menus"></param> /// <param name="imgList"></param> /// <returns></returns> public static ToolBarButton[] GetButtons(TBarItemList itemList,CommandMenu[] menus,ImageList imgList){ int length = itemList.Count; CommandToolBarButton[] ret = new CommandToolBarButton[length]; ToolBarItemCfg item; ICommand cmd; for (int i = 0;i < length;i++){ item = itemList[i]; ret[i] = new CommandToolBarButton(item.Caption); ret[i].ID = item.ID; if (item.Caption == "|") ret[i].Style = ToolBarButtonStyle.Separator; else{ ret[i].Enabled = !item.Disable; if (item.Image != null && item.Image.Length > 0) { imgList.Images.Add(new Icon(GetToolBarButtonIcon(item.Image))); ret[i].ImageIndex = imgList.Images.Count - 1; } if (item.RelateMenuID != null && item.RelateMenuID.Length > 0) { cmd = getRelateMenu(item.RelateMenuID,menus); if (cmd == null) { continue; } ret[i].SetCommand(cmd); ret[i].OnClick += evh; } if (item.Items.Count > 0) { ret[i].Style = ToolBarButtonStyle.DropDownButton; ContextMenu dpMenu = new ContextMenu(); dpMenu.MenuItems.AddRange(getContextMenu(item.Items,menus)); ret[i].DropDownMenu = dpMenu; } } } return ret; } /**//// <summary> /// 取得按钮的下拉菜单 /// </summary> /// <param name="itemList"></param> /// <param name="menus"></param> /// <returns></returns> private static CommandMenu[] getContextMenu(TBarItemList itemList,CommandMenu[] menus){ int length = itemList.Count; CommandMenu[] ret = new CommandMenu[length]; ToolBarItemCfg item; ICommand cmd; for (int i = 0;i < length;i++){ item = itemList[i]; ret[i] = new CommandMenu(item.Caption); ret[i].Enabled = !item.Disable; if (item.RelateMenuID != null && item.RelateMenuID.Length > 0) { cmd = getRelateMenu(item.RelateMenuID,menus); if (cmd == null) { continue; } ret[i].SetCommand(cmd); ret[i].Click += evh; } if (item.Items.Count > 0){ ret[i].MenuItems.AddRange(getContextMenu(item.Items,menus)); } } return ret; } /**//// <summary> /// 取得工具栏按钮对应的菜单项的ICommand /// </summary> /// <param name="id">菜单ID</param> /// <param name="menus">在其中查找菜单项</param> /// <returns></returns> private static ICommand getRelateMenu(string id,CommandMenu[] menus){ ICommand cmd; for (int i = 0;i < menus.Length;i++){ if (menus[i].MenuItems.Count > 0){ CommandMenu[] children = new CommandMenu[menus[i].MenuItems.Count]; menus[i].MenuItems.CopyTo(children,0); cmd = getRelateMenu(id,children); if (cmd == null) continue; else return cmd; }else{ cmd = menus[i].GetCommand(); if (cmd != null && id == cmd.ID) return cmd; } } return null; } public static string GetToolBarButtonIcon(string fileName) { return System.IO.Path.Combine(ICONPATH,fileName); } }注意这里的设定，工具栏按钮（及其带的下拉菜单）肯定是要有相应的主菜单菜单项对应的，换言之就是不存在孤立的工具栏按钮，否则此按钮（及其带的下拉菜单）是无效的。
上面是模块的菜单与工具栏加载，主窗体的菜单与工具栏的加载当然与此类同，只是那里除此之外，还有一些固定的菜单与工具栏，比如“退出”、“帮助”、“关于”等等，无论需求如何变，这些东西总归是要的，我就直接在主程序的菜单与工具栏里把这些项的内容做死了，用不着经过配置。但顺序没有做死，比如“帮助”这样的菜单（或工具栏）总是加载到最后一项的。
