MEF不导入元数据

Question

因此，我有用元数据属性装饰的导出，但在容器上它看起来像这些零件的元数据集合是空的，因此不能正确导入具有元数据的Lazy集合。

任何思考为什么发生这种情况？

Answer 1

确保您配置组件的MEF你的引导程序里面探查：

protected override void ConfigureAggregateCatalog() 
     { 
      base.ConfigureAggregateCatalog(); 

      // Need to add self explicitly, otherwise MEF won't know exports we have here 
      this.AggregateCatalog.Catalogs.Add(new AssemblyCatalog(Assembly.GetExecutingAssembly())); 

      // Also adding Model project - this is some project that you reference but not Module 
      this.AggregateCatalog.Catalogs.Add(new AssemblyCatalog(typeof(Model.ModelService).Assembly)); 
     }