标签：
[ImportMany(typeof(ILogger))]
public IEnumerable<ILogger> Loggers { get; set; }上述代码和单个部件的导入有两点区别：static void Main(string[] args)
{
Program program = new Program();
program.Compose();
foreach (ILogger logger in program.Loggers)
{
logger.WriteLog("Hello World!");
}
Console.ReadLine();
}/// <summary>
/// 通过容器对象将宿主和部件组装到一起。
/// </summary>
public void Compose()
{
AggregateCatalog aggregateCatalog = new AggregateCatalog();
AssemblyCatalog assemblyCatalog = new AssemblyCatalog(typeof(Program).Assembly);
DirectoryCatalog directoryCatalog = new DirectoryCatalog("imps");
aggregateCatalog.Catalogs.Add(assemblyCatalog);
aggregateCatalog.Catalogs.Add(directoryCatalog);
var container = new CompositionContainer(aggregateCatalog);
container.ComposeParts(this);
}上述代码中有一个AggregateCatalog的目录类，这是一个聚合目录，它可以将多个目录组织在一起，比如上列中的AssemblyCatalog和DirectoryCatalog。这样，MEF就会在多个地方去搜寻匹配的导出部件。[MEF]第04篇 MEF的多部件导入(ImportMany)和目录服务
标签：
原文地址：http://blog.csdn.net/gjysk/article/details/44948081
