[转载]基于ASP.NET MVC3 Razor的模块化/插件式架构实现 – Mainz – 博客园.
本文主要探讨了一种基于ASP.NET MVC3 Razor的模块化(Plugin)/插件(plugin)式架构的实现方法。本文借鉴了《Compile your asp.net mvc Razor views into a seperate dll》作者提供的方法。敬请注意。其实ASP.NET MVC的模块化(Plugin)/插件(plugin)式架构讨论的很多,但基于Razor视图引擎的很少(如:MVC2插件架构例子都是基于WebForm的,MVCContrib Portable Areas也是,还有这个Plugin架构)。要么就是非常复杂非常重量级的框架,例如Orchard CMS的模块化做的很好,可惜太重量级了,也没独立的模块可以剥离出来。所以我们追寻的是简单的基于ASP.NET MVC3 Razor的模块化(Plugin)/插件(plugin)式架构的实现方法。本文最后实现的项目结构如下图:(插件都放到~/Plugin目录下,按功能划分模块,每个模块都有M,V,C)
其 中,业务模块(class library project)包含其所有的视图、控制器等,模型可以放在里面也可以单独放一个project。主web项目没有引用业务模块,业务模块会编译到主 web项目的~/plugin目录下面(注意:不是bin目录),然后当web应用启动的时候自动加载plugin目录下面的模块。最后运行起来的效果如 下图:
其中红色的区域都是plugin进去的,那个tab的标题plugin到母版页的主菜单,tab内容也来自plugin。下面说说如何实现这样的ASP.NET MVC插件式plugin架构(模块化架构)。
实现的难点在动态加载UI视图(*.cshtml, _layout.cshtml, _viewStart.cshtml)
废话少说,直入要害。基于ASP.NET MVC3 Razor的编译发生在两个层面:
- 控制器(Controller), 模型(Models),和其它所有的C#代码等有msbuild(或者VisualStudio)编译到bin目录下的程序集(assembly)
- 视图(*.aspx, *.cshtml)由ASP.NET在运行时动态编译。当一个Razor视图(*.cshtml)显示前,Razor视图引擎调用BuildManager把视图(*.cshtml)编译到动态程序集assembly,然后使用Activator.CreateInstance来实例化新编译出来的对象,最后显示出来。如果视图(*.cshtml)用到@model绑定model,那么还会自动加载bin或者GAC里面的Model。
所 以如果我们要动态加载插件(plugin),用反射bin目录下的程序集(assembly)的方法很容易搞定上面的第一部分(C#代码的部分),但UI 视图的部分(上面第二部分)(特别是*.cshtml, 母版_layout.cshtml, 基视图_viewStart.cshtml)就比较难搞定。而且每次报错都是一样的,那就是Controller找不到相应的视图View,基本不知所云 而且根本不是要点:view …. or its master was not found or no view engine supports the searched locations. The following locations were searched: …,因此要搞定UI视图的部分(上面第二部分)(特别是*.cshtml, 母版_layout.cshtml, 基视图_viewStart.cshtml),就需要自己动手了,基本原理是:
- 重载RazorBuildProvider,用来动态编译视图
- 实现一个自定义VirtualPathProvider,从虚拟路径自定义判断读取资源(从插件中加载资源),如果要使用编译的视图就返回编译的VirtualFile
- 实 现一个容器Dictionary保存已编译的视图和虚拟路径,例如path <~/views/team/index.cshtml> type <Area.Module2.Views.Team._Page_Views_Team_Index_cshtml>,或者path <~/views/_viewstart.cshtml> type <Area.Module1.Views._Page_Views__ViewStart_cshtml>
代码:自定义VirtualPathProvider,从虚拟路径自定义判断读取资源(从插件中加载资源),如果要使用编译的视图就返回编译的VirtualFile
using System; 2: using System.Collections.Generic; 3: using System.Linq; 4: using System.Reflection; 5: using System.Web.Caching; 6: using System.Web.Hosting; 7: using System.Web.WebPages; 8: 9: namespace Common.Framework 10: { 11: public class CompiledVirtualPathProvider: VirtualPathProvider 12: { 13: /// <summary>14: /// Gets a value that indicates whether a file exists in the virtual file system.15: /// </summary> 16: /// 17: /// true if the file exists in the virtual file system; otherwise, false. 18: /// 19: ///The path to the virtual file. 20: public override bool FileExists(string virtualPath) 21: { 22: return 23: GetCompiledType(virtualPath) != null 24: || Previous.FileExists(virtualPath); 25: } 26: 27: public Type GetCompiledType(string virtualPath) 28: { 29: return ApplicationPartRegistry.Instance.GetCompiledType(virtualPath); 30: } 31: 32: /// <summary>33: /// Gets a virtual file from the virtual file system.34: /// </summary> 35: /// 36: /// A descendent of theclass that represents a file in the virtual file system. 37: /// 38: ///The path to the virtual file. 39: public override VirtualFile GetFile(string virtualPath) 40: { 41: if (Previous.FileExists(virtualPath)) 42: { 43: return Previous.GetFile(virtualPath); 44: } 45: var compiledType = GetCompiledType(virtualPath); 46: if (compiledType != null) 47: { 48: return new CompiledVirtualFile(virtualPath, compiledType); 49: } 50: return null; 51: } 52: 53: public override System.Web.Caching.CacheDependency GetCacheDependency(string virtualPath, System.Collections.IEnumerable virtualPathDependencies, DateTime utcStart) 54: { 55: if (virtualPathDependencies == null) 56: return Previous.GetCacheDependency(virtualPath, virtualPathDependencies, utcStart); 57: 58: return Previous.GetCacheDependency(virtualPath, 59: from vp in virtualPathDependencies.Cast() 60: where GetCompiledType(vp) == null 61: select vp 62: , utcStart); 63: } 64: 65: } 66: }
代码:容器Dictionary保存已编译的视图和虚拟路径,例如path <~/views/team/index.cshtml> type ,路径注册以后,会从容器库全局搜索所有注册过的视图,也就是说即使你视图引用的_layout.cshtml和_viewStart.cshtml在其他的Class library project照样可以找到。
1: using System; 2: using System.Collections.Generic; 3: using System.Diagnostics; 4: using System.Linq; 5: using System.Reflection; 6: using System.Web; 7: using System.Web.WebPages; 8: 9: namespace Common.Framework 10: { 11: public class DictionaryBasedApplicationPartRegistry : IApplicationPartRegistry 12: { 13: private static readonly Type webPageType = typeof(WebPageRenderingBase); 14: private readonly DictionaryregisteredPaths = new Dictionary(); 15: 16: /// <summary>17: ///18: /// </summary> 19: /// 20: /// 21: public virtual Type GetCompiledType(string virtualPath) 22: { 23: if (virtualPath == null) throw new ArgumentNullException("virtualPath"); 24: 25: //Debug.WriteLine(String.Format("---GetCompiledType : virtualPath", virtualPath)); 26: 27: if (virtualPath.StartsWith("/")) 28: virtualPath = VirtualPathUtility.ToAppRelative(virtualPath); 29: if (!virtualPath.StartsWith("~")) 30: virtualPath = !virtualPath.StartsWith("/") ? "~/" + virtualPath : "~" + virtualPath; 31: virtualPath = virtualPath.ToLower(); 32: return registeredPaths.ContainsKey(virtualPath) 33: ? registeredPaths[virtualPath] 34: : null; 35: } 36: 37: public void Register(Assembly applicationPart) 38: { 39: ((IApplicationPartRegistry)this).Register(applicationPart, null); 40: } 41: 42: public virtual void Register(Assembly applicationPart, string rootVirtualPath) 43: { 44: //Debug.WriteLine(String.Format("---Register assembly, path", applicationPart.FullName, rootVirtualPath)); 45: 46: foreach (var type in applicationPart.GetTypes().Where(type => type.IsSubclassOf(webPageType))) 47: { 48: //Debug.WriteLine(String.Format("-----Register type, path", type.FullName, rootVirtualPath)); 49: 50: ((IApplicationPartRegistry)this).RegisterWebPage(type, rootVirtualPath); 51: } 52: } 53: 54: public void RegisterWebPage(Type type) 55: { 56: ((IApplicationPartRegistry)this).RegisterWebPage(type, string.Empty); 57: } 58: 59: public virtual void RegisterWebPage(Type type, string rootVirtualPath) 60: { 61: var attribute = type.GetCustomAttributes(typeof(PageVirtualPathAttribute), false).Cast().SingleOrDefault(); 62: if (attribute != null) 63: { 64: var rootRelativeVirtualPath = GetRootRelativeVirtualPath(rootVirtualPath ?? "", attribute.VirtualPath); 65: 66: //Debug.WriteLine(String.Format("---Register path/type : pathtype", rootRelativeVirtualPath.ToLower(), 67: // type.FullName)); 68: registeredPaths[rootRelativeVirtualPath.ToLower()] = type; 69: } 70: } 71: 72: static string GetRootRelativeVirtualPath(string rootVirtualPath, string pageVirtualPath) 73: { 74: string relativePath = pageVirtualPath; 75: if (relativePath.StartsWith("~/", StringComparison.Ordinal)) 76: { 77: relativePath = relativePath.Substring(2); 78: } 79: if (!rootVirtualPath.EndsWith("/", StringComparison.OrdinalIgnoreCase)) 80: { 81: rootVirtualPath = rootVirtualPath + "/"; 82: } 83: relativePath = VirtualPathUtility.Combine(rootVirtualPath, relativePath); 84: if (!relativePath.StartsWith("~")) 85: { 86: return !relativePath.StartsWith("/") ? "~/" + relativePath : "~" + relativePath; 87: } 88: return relativePath; 89: } 90: } 91: }
下面的代码很关键,用PreApplicationStartMethod关键字(.NET 4.0开始支持)使得代码在Application_Start之前执行。
有关[assembly: PreApplicationStartMethod(typeof(SomeClassLib.Initializer), “Initialize”)]详细信息请参考这个页面和这个页面。
1: using System.Web; 2: using System.Web.Compilation; 3: using System.Web.Hosting; 4: using Common.Framework; 5: using Common.PrecompiledViews; 6: 7: [assembly: PreApplicationStartMethod(typeof(PreApplicationStartCode), "Start")] 8: 9: namespace Common.Framework 10: { 11: public static class PreApplicationStartCode 12: { 13: private static bool _startWasCalled; 14: 15: public static void Start() 16: { 17: if (_startWasCalled) 18: { 19: return; 20: } 21: _startWasCalled = true; 22: 23: //Register virtual paths 24: HostingEnvironment.RegisterVirtualPathProvider(new CompiledVirtualPathProvider()); 25: 26: //Load Plugin Folder, 27: PluginLoader.Initialize(); 28: } 29: } 30: }
代码:PluginLoader,加载plugin目录里面的东东(assembly和module配置文件)
1: using System; 2: using System.Collections.Generic; 3: using System.IO; 4: using System.Linq; 5: using System.Reflection; 6: using System.Text; 7: using System.Threading; 8: using System.Web; 9: using System.Web.Compilation; 10: using System.Web.Hosting; 11: using Common.Framework; 12: using Common.PrecompiledViews; 13: 14: //[assembly: PreApplicationStartMethod(typeof(PluginLoader), "Initialize")] 15: 16: namespace Common.PrecompiledViews 17: { 18: public class PluginLoader 19: { 20: public static void Initialize(string folder = "~/Plugin") 21: { 22: LoadAssemblies(folder); 23: LoadConfig(folder); 24: } 25: 26: private static void LoadConfig(string folder, string defaultConfigName="*.config") 27: { 28: var directory = new DirectoryInfo(HostingEnvironment.MapPath(folder)); 29: var configFiles = directory.GetFiles(defaultConfigName, SearchOption.AllDirectories).ToList(); 30: if (configFiles.Count == 0) return; 31: 32: foreach (var configFile in configFiles.OrderBy(s => s.Name)) 33: { 34: ModuleConfigContainer.Register(new ModuleConfiguration(configFile.FullName)); 35: } 36: } 37: 38: private static void LoadAssemblies(string folder) 39: { 40: var directory = new DirectoryInfo(HostingEnvironment.MapPath(folder)); 41: var binFiles = directory.GetFiles("*.dll", SearchOption.AllDirectories).ToList(); 42: if (binFiles.Count == 0) return; 43: 44: foreach (var plug in binFiles) 45: { 46: //running in full trust 47: //************ 48: //if (GetCurrentTrustLevel() != AspNetHostingPermissionLevel.Unrestricted) 49: //set in web.config, probing to plugin\temp and copy all to that folder 50: //************************ 51: var shadowCopyPlugFolder = new DirectoryInfo(AppDomain.CurrentDomain.DynamicDirectory); 52: var shadowCopiedPlug = new FileInfo(Path.Combine(shadowCopyPlugFolder.FullName, plug.Name)); 53: File.Copy(plug.FullName, shadowCopiedPlug.FullName, true); //TODO: Exception handling here... 54: var shadowCopiedAssembly = Assembly.Load(AssemblyName.GetAssemblyName(shadowCopiedPlug.FullName)); 55: 56: //add the reference to the build manager 57: BuildManager.AddReferencedAssembly(shadowCopiedAssembly); 58: } 59: } 60: 61: //private static AspNetHostingPermissionLevel GetCurrentTrustLevel() 62: //{ 63: // foreach (AspNetHostingPermissionLevel trustLevel in 64: // new AspNetHostingPermissionLevel[] 65: // { 66: // AspNetHostingPermissionLevel.Unrestricted, 67: // AspNetHostingPermissionLevel.High, 68: // AspNetHostingPermissionLevel.Medium, 69: // AspNetHostingPermissionLevel.Low, 70: // AspNetHostingPermissionLevel.Minimal 71: // }) 72: // { 73: // try 74: // { 75: // new AspNetHostingPermission(trustLevel).Demand(); 76: // } 77: // catch (System.Security.SecurityException) 78: // { 79: // continue; 80: // } 81: 82: // return trustLevel; 83: // } 84: 85: // return AspNetHostingPermissionLevel.None; 86: //} 87: 88: } 89: }
此外,使用SingleFileGenerator的优点是性能提升,缺点是修改了视图就要重新编译。
如何让ASP.NET加载BIN目录之外的路径的Assembly
我们把各个模块编译出来的assembly和各个模块的配置文件自动放到一个bin平级的plugin目录,然后web应用启动的时候自动扫描这个 plugin目录并加载各个模块plugin,这个怎么做到的?大家也许知道,ASP.NET只允许读取Bin目录下的assbmely,不可以读取其他 路径,包括Bin\abc等,即使在web.config这样配置probing也不行:(不信你可以试一下)
1: <configuration> Element
2: <runtime> Element
3: <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
4: <probing privatePath="bin;bin\abc;plugin;"/>
5: </assemblyBinding>
6: </runtime>
7: </configuration>
这个和TrustLevel有关,在Full Trust的情况下,可以这样读取非Bin目录下的assembly:
首先在和Bib平级的地方建一个目录Plugin,然后在模块class library project的属性里面加一个postBuildEvent,就是说在编译完成以后把模块的assbmely自动拷贝到主web项目的plugin目录:
1: copy /Y "$(TargetDir)$(ProjectName).dll" "$(SolutionDir)ModularWebApplication\Plugin\"
2: copy /Y "$(TargetDir)$(ProjectName).config" "$(SolutionDir)ModularWebApplication\Plugin\"
3:
然后用下面的代码加载Plugin目录下的assembly:(只看LoadAssembly那一段)
1: using System; 2: using System.Collections.Generic; 3: using System.IO; 4: using System.Linq; 5: using System.Reflection; 6: using System.Text; 7: using System.Threading; 8: using System.Web; 9: using System.Web.Compilation; 10: using System.Web.Hosting; 11: using Common.Framework; 12: using Common.PrecompiledViews; 13: 14: //[assembly: PreApplicationStartMethod(typeof(PluginLoader), "Initialize")] 15: 16: namespace Common.PrecompiledViews 17: { 18: public class PluginLoader 19: { 20: public static void Initialize(string folder = "~/Plugin") 21: { 22: LoadAssemblies(folder); 23: LoadConfig(folder); 24: } 25: 26: private static void LoadConfig(string folder, string defaultConfigName="*.config") 27: { 28: var directory = new DirectoryInfo(HostingEnvironment.MapPath(folder)); 29: var configFiles = directory.GetFiles(defaultConfigName, SearchOption.AllDirectories).ToList(); 30: if (configFiles.Count == 0) return; 31: 32: foreach (var configFile in configFiles.OrderBy(s => s.Name)) 33: { 34: ModuleConfigContainer.Register(new ModuleConfiguration(configFile.FullName)); 35: } 36: } 37: 38: private static void LoadAssemblies(string folder) 39: { 40: var directory = new DirectoryInfo(HostingEnvironment.MapPath(folder)); 41: var binFiles = directory.GetFiles("*.dll", SearchOption.AllDirectories).ToList(); 42: if (binFiles.Count == 0) return; 43: 44: foreach (var plug in binFiles) 45: { 46: //running in full trust 47: //************ 48: //if (GetCurrentTrustLevel() != AspNetHostingPermissionLevel.Unrestricted) 49: //set in web.config, probing to plugin\temp and copy all to that folder 50: //************************ 51: var shadowCopyPlugFolder = new DirectoryInfo(AppDomain.CurrentDomain.DynamicDirectory); 52: var shadowCopiedPlug = new FileInfo(Path.Combine(shadowCopyPlugFolder.FullName, plug.Name)); 53: File.Copy(plug.FullName, shadowCopiedPlug.FullName, true); //TODO: Exception handling here... 54: var shadowCopiedAssembly = Assembly.Load(AssemblyName.GetAssemblyName(shadowCopiedPlug.FullName)); 55: 56: //add the reference to the build manager 57: BuildManager.AddReferencedAssembly(shadowCopiedAssembly); 58: } 59: } 60: 61: //private static AspNetHostingPermissionLevel GetCurrentTrustLevel() 62: //{ 63: // foreach (AspNetHostingPermissionLevel trustLevel in 64: // new AspNetHostingPermissionLevel[] 65: // { 66: // AspNetHostingPermissionLevel.Unrestricted, 67: // AspNetHostingPermissionLevel.High, 68: // AspNetHostingPermissionLevel.Medium, 69: // AspNetHostingPermissionLevel.Low, 70: // AspNetHostingPermissionLevel.Minimal 71: // }) 72: // { 73: // try 74: // { 75: // new AspNetHostingPermission(trustLevel).Demand(); 76: // } 77: // catch (System.Security.SecurityException) 78: // { 79: // continue; 80: // } 81: 82: // return trustLevel; 83: // } 84: 85: // return AspNetHostingPermissionLevel.None; 86: //} 87: 88: } 89: }
如果不是Full Trust,例如Medium Trust的情况下参考这个帖子《Developing-a-plugin-framework-in-ASPNET-with-medium-trust》。
如何在_layout.cshtml的主菜单注入plugin的菜单
在母版页_layout.cshtml有个主菜单,一般是这样写的:
1: <ul>
2: <li>@Html.ActionLink("Home", "Index", "Home")</li>
3: <li>@Html.ActionLink("About", "About", "Home")</li>
4: <li>@Html.ActionLink("Team", "Index", "Team")</li>
5: </ul>
现在我们如何实现从模块插入plugin到这个主菜单呢?这个有点难。因为大家知道,_layout.cshml母版没有controller。怎 么实现呢?方法是用controller基类,让所有controller继承自这个基类。然后在基类里面,读取plugin目录里面的配置文件,获取所 有模块需要插入的主菜单项,然后放入viewBag,这样在_Layout.cshtml就可以获取viewBag,类似这样:
1: <ul>
2: @foreach (MainMenuItemModel entry in ViewBag.MainMenuItems)
3: {
4: <li>@Html.ActionLink(entry.Text,
5: entry.ActionName,
6: entry.ControllerName)</li>
7: }
8: </ul>
代码:基类Controller,读取plugin目录里面的配置文件,获取所有模块需要插入的主菜单项,然后放入viewBag
1: using System;
2: using System.Collections;
3: using System.Collections.Generic;
4: using System.ComponentModel;
5: using System.Linq;
6: using System.Net.Mime;
7: using System.Text;
8: using System.Web.Mvc;
9:
10: namespace Common.Framework
11: {
12: public class BaseController : Controller
13: {
14: protected override void Initialize(System.Web.Routing.RequestContext requestContext)
15: {
16: base.Initialize(requestContext);
17:
18: // retireve data from plugins
19: IEnumerable<ModuleConfiguration> ret = ModuleConfigContainer.GetConfig();
20:
21: var data = (from c in ret
22: from menu in c.MainMenuItems
23: select new MainMenuItemModel
24: {
25: Id = menu.Id, ActionName = menu.ActionName, ControllerName = menu.ControllerName, Text = menu.Text
26: }).ToList();
27:
28: ViewBag.MainMenuItems = data.AsEnumerable();
29: }
30:
31: }
32: }
代码:ModuleConfigContainer,用到单例模式,只读取一次
1: using System;
2: using System.Collections.Generic;
3: using System.Linq;
4: using System.Text;
5:
6: namespace Common.Framework
7: {
8: public static class ModuleConfigContainer
9: {
10: static ModuleConfigContainer()
11: {
12: Instance = new ModuleConfigDictionary();
13: }
14:
15: internal static IModuleConfigDictionary Instance { get; set; }
16:
17: public static void Register(ModuleConfiguration item)
18: {
19: Instance.Register(item);
20: }
21:
22: public static IEnumerable<ModuleConfiguration> GetConfig()
23: {
24: return Instance.GetConfigs();
25: }
26: }
27: }
代码:ModuleConfigDictionary
1: using System;
2: using System.Collections.Generic;
3: using System.Linq;
4: using System.Text;
5:
6: namespace Common.Framework
7: {
8: public class ModuleConfigDictionary : IModuleConfigDictionary
9: {
10: private readonly Dictionary<string, ModuleConfiguration> _configurations = new Dictionary<string, ModuleConfiguration>();
11:
12: public IEnumerable<ModuleConfiguration> GetConfigs()
13: {
14: return _configurations.Values.AsEnumerable();
15: }
16:
17: public void Register(ModuleConfiguration item)
18: {
19: if(_configurations.ContainsKey(item.ModuleName))
20: {
21: _configurations[item.ModuleName] = item;
22: }
23: else
24: {
25: _configurations.Add(item.ModuleName, item);
26: }
27: }
28: }
29: }
代码:ModuleConfiguration,读取模块的配置文件
1: using System;
2: using System.Collections.Generic;
3: using System.IO;
4: using System.Linq;
5: using System.Text;
6: using System.Xml;
7: using System.Xml.Linq;
8:
9: namespace Common.Framework
10: {
11: public class ModuleConfiguration
12: {
13: public ModuleConfiguration(string filePath)
14: {
15: try
16: {
17: var doc = XDocument.Load(filePath);
18: var root = XElement.Parse(doc.ToString());
19:
20: if (!root.HasElements) return;
21:
22: var module = from e in root.Descendants("module")
23: //where e.Attribute("name").Value == "xxxx"
24: select e;
25:
26: if (!module.Any()) return;
27:
28: ModuleName = module.FirstOrDefault().Attribute("name").Value;
29:
30: var menus = from e in module.FirstOrDefault().Descendants("menu")
31: select e;
32:
33: if (!menus.Any()) return;
34:
35: var menuitems = menus.Select(xElement => new MainMenuItemModel
36: {
37: Id = xElement.Attribute("id").Value,
38: Text = xElement.Attribute("text").Value,
39: ActionName = xElement.Attribute("action").Value,
40: ControllerName = xElement.Attribute("controller").Value
41: }).ToList();
42:
43: MainMenuItems = menuitems;
44: }
45: catch
46: {
47: //TODO: logging
48: }
49: }
50: public string ModuleName { get; set; }
51: public IEnumerable<MainMenuItemModel> MainMenuItems { get; set; }
52: }
53: }
每个模块的配置文件为{projectName}.config,格式如下:
1: <?xml version="1.0" encoding="utf-8" ?>
2: <configuration>
3: <module name="Module2">
4: <mainmenu>
5: <menu id="modul2" text="Team" action="Index" controller="Team"/>
6: </mainmenu>
7: </module>
8: </configuration>
为了简单起见,只保留了注入主菜单的部分,为了让读者简单易懂。明白了以后你自己可以任意扩展…
代码:IModuleConfigDictionary,接口
模块配置文件{projectName}.config的位置:
为什么每个模块的Class library project都需要一个web.config呢?因为如果没有这个,那就没有Razor智能提示,大家可以参考这篇文章《How to get Razor intellisense for @model in a class library project》。
闲话几句插件式架构(Plugin Architecture)或者模块化(Modular)架构
插件式架构(Plugin Architecture)或者模块化(Modular)架构是大型应用必须的架构,关于什么是Plugin,什么是模块化模式,这种架构的优缺点等我就不说了,自己百谷歌度。关于.NET下面的插件式架构和模块化开发实现方法,基本上用AppDomain实现,当检测到一个新的插件Plugin时,实例化一个新的AppDomain并加载Assembly反射类等,由于AppDomain很好的隔离各个Plugin,所以跨域通信要用MarshalByRefObject类,具体做法可以参考这篇文章《基于AppDomain的”插件式”开发》。另外,有很多框架提供了模块化/插件开发的框架,例如Prism、MEF(Managed Extensibility Framework,.NET 4.0 内置)等。
客户端插件架构
还有一种插件架构是客户端插件架构(JavaScript 模块化),如jQuery UI Widget Factory,Silk Project就是很好的例子。
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源码下载请点击此处。运行源码之前务必阅读此文和本文。注意:本文抛砖引玉,力求简单,易懂,并非完整的架构实现,更多丰富的功能实现一切皆有可能,只要在理解的基础上。