关于MEF

var catalog = new AssemblyCatalog(Assembly.GetExecutingAssembly()); //创建一个程序集目录，用于从一个程序集获取所有的组件定义   
var container = new CompositionContainer(catalog); //创建组合容器   
var composablePart = new MyComponent();   
container.ComposeParts(composablePart); //=获取ExportDefinition并创建实例组合在一起 

TypeCatalog cat = new TypeCatalog(typeof(IRepository<T_JSSDD_DDZB_SXPZ>),
                typeof(IRepository<T_JSSDD_DDZB_SBXM>),
                typeof(IRepository<T_JSSDD_DDZB_SXPZVALUE>), typeof(IRepository<T_JSSDD_DDZB_XM_R_SX>));
            //如果程序集比较小的话，可以使用AssemblyCatalog来初始化组合容器，程序集如果比较大，那么由于反射查找整个程序集
            //所以性能上很差，建议使用上面TypeCatalog来初始化组合容器
            AssemblyCatalog catalog = new AssemblyCatalog(Assembly.GetExecutingAssembly());
            var container = new CompositionContainer(cat);
            container.ComposeParts(this,
                new T_JSSDD_DDZB_SBXMRepository(),
                new T_JSSDD_DDZB_SXPZRepository(),
                new T_JSSDD_DDZB_XM_R_SXRepository(),
                new T_JSSDD_DDZB_SXPZVALUERepository()
                );

/// <summary>
    /// 导出特性
    /// </summary>
    [Export(typeof(ICal1))]
    public class Class1 : ICal1
    {
        public void C()
        {
            Console.WriteLine("实现二");
        }
    }

/// <summary>
    /// 导出特性
    /// </summary>
    [Export(typeof(ICalculator))]
    public class MySimpleCalculator : ICalculator
    {
        public string Calculate(string input)
        {
            Console.WriteLine("已经实现的方法");
            return null;
        }
    }


 public class Container
    {
        /// <summary>
        /// 导入
        /// </summary>
        [Import(typeof(ICalculator))]
        public ICalculator ICalculator { get; set; }
        /// <summary>
        /// 导入特性
        /// </summary>
        [Import(typeof(ICal1))]
        public ICal1 ICal1 { get; set; }

        //初始化容器
        public Container()
        {
            AssemblyCatalog catalog = new AssemblyCatalog(Assembly.GetExecutingAssembly());
            var container = new CompositionContainer(catalog);
            container.ComposeParts(this,new MySimpleCalculator(), new Class1());
        }


    }

      static void Main(string[] args)
        {
            Container container = new Container();
            Console.WriteLine("Enter Command:");
            container.ICal1.C();
            Console.WriteLine(container.ICalculator.Calculate(""));
            Console.Read();
        }