封装：MEF组件式框架封装

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一、简介：MEF框架是用于创建可扩展的轻型应用程序的库；

二、目的：对原生结构进行封装方便使用；

三、实现步骤：

 1、定义接口

    public interface IMefDemoBase{void Init();}

2、实现接口和特性

    /// <summary> ① 必须拥有Export特性  [Export(typeof(IMefDemoBase))] </summary>[Export(typeof(IMefDemoBase))]public class MefDemoBase : IMefDemoBase{public void Init(){throw new NotImplementedException();}}

3、 构建组件集合

    /// <summary> 提供构建组件集合 </summary>public class MefEntityProvider<T>{// ② 必须拥有Export特性  [Export(typeof(IMefDemoBase))][ImportMany]List<T> doList;/// <summary> 获取所有接口 </summary>public List<T> DoList{get { return doList; }set { doList = value; }}/// <summary> 通过一组应用程序集创建一个MefEntityProvider </summary>public static MefEntityProvider<T> CreateInstance(List<Assembly> asses){//  ③ 必须拥有Export特性  [Export(typeof(IMefDemoBase))]MefEntityProvider<T> provider = new MefEntityProvider<T>();var catalog = new AggregateCatalog();asses.ForEach(l => catalog.Catalogs.Add(new AssemblyCatalog(l)));var _container = new CompositionContainer(catalog);_container.ComposeParts(provider);return provider;}/// <summary> 通过一个应用程序集创建一个MefEntityProvider </summary>public static MefEntityProvider<T> CreateInstance(Assembly ass){MefEntityProvider<T> provider = new MefEntityProvider<T>();var catalog = new AggregateCatalog();catalog.Catalogs.Add(new AssemblyCatalog(ass));var _container = new CompositionContainer(catalog);_container.ComposeParts(provider);return provider;}}

四、实现实例

    class Program{static void Main(string[] args){List<Assembly> ass = new List<Assembly>();ass.Add(Assembly.GetEntryAssembly());MefEntityProvider<IMefDemoBase> provider = MefEntityProvider<IMefDemoBase>.CreateInstance(ass);provider.DoList.ForEach(l => Console.WriteLine(l.ToString()));Console.Read();MefEntityProvider<IDisposable> provider1 = MefEntityProvider<IDisposable>.CreateInstance(ass);provider1.DoList.ForEach(l => Console.WriteLine(l.ToString()));Console.Read();}}

注：此结构会在加载的程序集中自动找到自定义的接口，实现动态加载

五、设计结构图

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