MEF不導入元數據

Question

因此，我有用元數據屬性裝飾的導出，但在容器上它看起來像這些零件的元數據集合是空的，因此不能正確導入具有元數據的Lazy集合。

任何思考爲什麼發生這種情況？

Answer 1

確保您配置組件的MEF你的引導程序裏面探查：

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)); 
     }