An example of MEF

MEF (Managed extensibility Framework). NET framework4.0 Join,

The biggest difference between MEF and MAF (Managed Addin Framework) is that the former focuses on using a very simple way to support scalable support with strong flexibility, which focuses on plug-in platform architectures with physical isolation, security, and multi-versioning support;

The difference between MEF and unity is that the former emphasizes the combination and the latter emphasizes dependency injection.

namespace interfaces{    publicinterface  IPlugin    {       void  Write () ;    }}

namespace oneplugin{[Export (typeof(IPlugin))]    publicclass  Oneplugin : IPlugin    {        publicvoid  Write ()        {            Console.WriteLine (  "oneplugin");     }}}

namespace twoplugin{    [Export (typeof (IPlugin))] public    class Twoplugin:iplugin    {public        void Write ()        {            Console.WriteLine ("Plugin");}        }    }

　　

namespacemefsample{classProgram {Static voidMain (string[] args) {            //plug-in implementation using reflection//ienumerable<type> plugintypes = Getplugintypes (); //foreach (type type in plugintypes)//{            //IPlugin plugin = (IPlugin) activator.createinstance (type); //plugin.            Write (); //}PlugInProvider Provider =NewPlugInProvider (); foreach(Lazy <IPlugin> Plugininchprovider. Plugins) {plugin. Value.write ();        } console.read (); }        /// <summary>        ///plug-in implementation using reflection/// </summary>        /// <returns></returns>         Public StaticIenumerable<type>getplugintypes () {stringRoot =AppDomain.CurrentDomain.BaseDirectory; string[] files = directory.getfiles (root,"*.dll", searchoption.topdirectoryonly); List<Type> types =NewList<type>(); foreach(stringFileinchfiles) {type[] Typearray=assembly.loadfrom (file).                GetTypes (); foreach(Type typeinchtypearray) types.            ADD (type); }            return  fromTypeinchTypeswhereType. IsClass && (typeof(IPlugin). IsAssignableFrom (Type))Selecttype; //or return with yield .        }    }     Public classPlugInProvider {[ImportMany] PublicIenumerable<lazy<iplugin>> Plugins {Get;Private Set; } //[Import]//Public lazy<iplugin> Pluginone;         PublicPlugInProvider () {//var catalog = new Assemblycatalog (assembly.getexecutingassembly ());Aggregatecatalog Catalog =NewAggregatecatalog (); Catalog. Catalogs.add (NewDirectorycatalog (".")); varcontainer =Newcompositioncontainer (catalog); Container.composeparts ( This); }    }}

You can also name:

 Public Interfaceilogger{voidWritelog (stringmessage);} [Export ("TXT",typeof(ILogger))] Public classtxtlogger:ilogger{ Public voidWritelog (stringmessage)    {System.Console.WriteLine (message); }}[export ("DB",typeof(ILogger))] Public classdblogger:ilogger{ Public voidWritelog (stringmessage)    {System.Console.WriteLine (message); }}

[Export]  Public class facadeservice{    [Import ("TXT")]    publicget  set;}    [Import ("DB")]      Public Get Set ; }}

[Import]public facadeservice Service {get; set;}

　　

 Public MainPage () {    InitializeComponent ();       var  as App). Service;    Service. Txtlogger.writelog (" write log to text file ");    Service. Dblogger.writelog (" write log to database ");} Copy Code

An example of MEF