MEF不导入元数据

Question

因此，我有使用元数据属性修饰的导出，但在容器上，这些部分的元数据集合似乎是空的，因此无法正确导入带元数据的Lazy集合。

有没有想过为什么会这样？

Answer 1

确保为MEF配置程序集以在Bootstrapper中进行探测：

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));
        }