/// <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);
}
}
}
}
