轉自：http://www.cnblogs.com/yunfeifei/p/3927663.html

前面說完了導入和導出的幾種方法，如果大家細心的話會注意到前面我們導出的都是類，那么方法和屬性能不能導出呢？？？答案是肯定的，下面就來說下MEF是如何導出方法和屬性的。

　　還是前面的代碼，第二篇中已經提供了下載鏈接，大家可以下載學習。

　　首先來說導出屬性，因為這個比較簡單，和導出類差不多，先來看看代碼，主要看我加注釋的地方，MusicBook.cs中的代碼如下：

using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.ComponentModel.Composition;namespace MEFDemo {[Export("MusicBook")]public class MusicBook : IBookService{//導出私有屬性[Export(typeof(string))]private string _privateBookName = "Private Music BookName";//導出公有屬性[Export(typeof(string))]public string _publicBookName = "Public Music BookName";public string BookName { get; set; }}[Export("MathBook", typeof(IBookService))]public class MathBook : IBookService{public string BookName { get; set; }public string GetBookName(){return "MathBook";}}[Export("HistoryBook", typeof(IBookService))]public class HistoryBook : IBookService{public string BookName { get; set; }public string GetBookName(){return "HistoryBook";}}}

program.cs中的代碼如下：

using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Reflection; using System.ComponentModel.Composition; using System.ComponentModel.Composition.Hosting;namespace MEFDemo {class Program{[ImportMany("MathBook")]public IEnumerable<object> Services { get; set; }//導入屬性，這里不區分public還是private [ImportMany]public List<string> InputString { get; set; }static void Main(string[] args){Program pro = new Program();pro.Compose();if (pro.Services != null){foreach (var s in pro.Services){var ss = (IBookService)s;Console.WriteLine(ss.GetBookName());}}foreach (var str in pro.InputString){Console.WriteLine(str);}Console.Read();}private void Compose(){var catalog = new AssemblyCatalog(Assembly.GetExecutingAssembly());CompositionContainer container = new CompositionContainer(catalog);container.ComposeParts(this);}} }

下面還用foreach遍歷輸出屬性的值，運行即可查看到結果。最后我會附上源碼供大家下載，這里就不再截圖了。

下面說導出方法吧，同理無論是公有方法還是私有方法都是可以導出的，MusicBook代碼如下：

using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.ComponentModel.Composition;namespace MEFDemo {[Export("MusicBook")]public class MusicBook : IBookService{//導出私有屬性[Export(typeof(string))]private string _privateBookName = "Private Music BookName";//導出公有屬性[Export(typeof(string))]public string _publicBookName = "Public Music BookName";public string BookName { get; set; }//導出公有方法[Export(typeof(Func<string>))]public string GetBookName(){return "MusicBook";}//導出私有方法[Export(typeof(Func<int, string>))]private string GetBookPrice(int price){return "$" + price;}}[Export("MathBook", typeof(IBookService))]public class MathBook : IBookService{public string BookName { get; set; }public string GetBookName(){return "MathBook";}}[Export("HistoryBook", typeof(IBookService))]public class HistoryBook : IBookService{public string BookName { get; set; }public string GetBookName(){return "HistoryBook";}}}

program中的代碼如下：

using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Reflection; using System.ComponentModel.Composition; using System.ComponentModel.Composition.Hosting;namespace MEFDemo {class Program{[ImportMany("MathBook")]public IEnumerable<object> Services { get; set; }//導入屬性，這里不區分public還是private [ImportMany]public List<string> InputString { get; set; }//導入無參數方法 [Import]public Func<string> methodWithoutPara { get; set; }//導入有參數方法 [Import]public Func<int,string> methodWithPara { get; set; }static void Main(string[] args){Program pro = new Program();pro.Compose();if (pro.Services != null){foreach (var s in pro.Services){var ss = (IBookService)s;Console.WriteLine(ss.GetBookName());}}foreach (var str in pro.InputString){Console.WriteLine(str);}//調用無參數方法if (pro.methodWithoutPara != null){Console.WriteLine(pro.methodWithoutPara());}//調用有參數方法if (pro.methodWithPara != null){Console.WriteLine(pro.methodWithPara(3000));}Console.Read();}private void Compose(){var catalog = new AssemblyCatalog(Assembly.GetExecutingAssembly());CompositionContainer container = new CompositionContainer(catalog);container.ComposeParts(this);}} }

導入導出方法用到了Func<T>委托，當然沒有返回值的話可以用Action<T>委托，關于委托這里就不多說了，大家可以自行百度。

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