/// <summary> /// 批量处理数据对象中的强关联集合数据, 此方法被反射调用 /// </summary> /// <typeparam name="TItemModel">业务对象中的集合元素类型</typeparam> /// <typeparam name="TItemEntity">数据对象中的集合元素类型</typeparam> /// <param name="model">业务对象</param> /// <param name="data">数据对象</param> private void ProcessCollection <TItemModel, TItemEntity>(TModel model, TEntity data) where TItemModel : class, IId <int> where TItemEntity : class, IDetailEntity { ICollection <TItemEntity> dataItemCollection = _entityRule.GetCollectionValue <TItemEntity>(data) as ICollection <TItemEntity>; ICollection <TItemModel> modelItemList = _modelRule.GetCollectionValue <TItemModel>(model) as ICollection <TItemModel>; //重新从数据库中加载原有集合以和现有集合进行比对 var oldModelItemList = GetCollection <TItemModel, TItemEntity>(model.Id); var itemMapper = new LangDataMapper <TItemModel, TItemEntity>(); //将新集合与已有集合进行比对,凡不在新集合中的原有集合ID所指对象代表已经被删除 var deletedItemIds = oldModelItemList.Select(m => m.Id).Except(modelItemList.Select(m => m.Id)); var deletedItems = oldModelItemList.Where(m => deletedItemIds.Contains(m.Id)); foreach (var modelItem in deletedItems) { var entityItem = itemMapper.ToEntity(modelItem); var logicalDeleteItem = entityItem as ICanLogicalDeleteEntity; if (logicalDeleteItem != null) { logicalDeleteItem.IsDeleted = true; MarkState(entityItem, EntityState.Modified); } else { MarkState(entityItem, EntityState.Deleted); } } //判断业务模型的子表哪些数据是新增/修改或删除的,转换成数据实体子项后,对其加上对应的EF标记 foreach (var modelItem in modelItemList) { var entityItem = itemMapper.ToEntity(modelItem); if (entityItem is IDetailEntity <TEntity> ) { ((IDetailEntity <TEntity>)entityItem).Master = data; } entityItem.MasterId = data.Id; if (modelItem.Id == 0) { dataItemCollection.Add(entityItem); MarkState(entityItem, EntityState.Added); } else { var oldModelItem = oldModelItemList.FirstOrDefault(item => item.Id == modelItem.Id); // 与原有ID相同的对象比较,如果内容不同说明已经被修改 if (CompareChanged(modelItem, oldModelItem)) { MarkState(entityItem, EntityState.Modified); } } } }