/// <summary>
/// 根据 optionNode 中的描述信息，读取 table 中的数据组装为对象列表并返回。
/// 如果 optionNode 中指定要加载更多的子/引用对象，则会递归调用自己实现聚合加载。
/// </summary>
/// <param name="list">The list.</param>
/// <param name="table">The table.</param>
/// <param name="optionNode">The option node.</param>
private void ReadFromTable(EntityList list, IDataTable table, LinkedListNode <LoadOptionItem> optionNode)
{
var option = optionNode.Value;
list.ReadFromTable(table, (entity, subTable) =>
{
EntityList listResult = null;
//是否还有后继需要加载的对象？如果是，则递归调用自己进行子对象的加载。
var nextNode = optionNode.Next;
if (nextNode != null)
{
listResult = nextNode.Value.OwnerRepository.NewList();
this.ReadFromTable(listResult, subTable, nextNode);
}
else
{
listResult = option.PropertyEntityRepository.NewList();
listResult.ReadFromTable(subTable);
}
//是否需要排序？
if (listResult.Count > 1 && option.OrderBy != null)
{
listResult = option.PropertyEntityRepository.NewListOrderBy(listResult, option.OrderBy);
}
//当前对象是加载类型的子对象还是引用的外键
if (option.LoadType == AggregateLoadType.Children)
{
listResult.SetParentEntity(entity);
entity.LoadProperty(option.PropertyMeta.ManagedProperty, listResult);
}
else
{
if (listResult.Count > 0)
{
option.SetReferenceEntity(entity, listResult[0]);
}
}
});
}
/// <summary>
/// 执行懒加载操作。
/// </summary>
/// <param name="listProperty">The list property.</param>
/// <returns></returns>
private EntityList LoadLazyList(IListProperty listProperty)
{
EntityList data = null;
if (this.FieldExists(listProperty))
{
data = this.GetProperty(listProperty) as EntityList;
if (data != null)
{
return(data);
}
}
if (this.IsNew)
{
var listRepository = RepositoryFactoryHost.Factory.FindByEntity(listProperty.ListEntityType);
data = listRepository.NewList();
}
else
{
var meta = listProperty.GetMeta(this) as IListPropertyMetadata;
var dataProvider = meta.DataProvider;
if (dataProvider != null)
{
data = dataProvider(this);
}
else
{
var listRepository = RepositoryFactoryHost.Factory.FindByEntity(listProperty.ListEntityType) as IRepositoryInternal;
data = listRepository.GetLazyListByParent(this);
data.SetParentEntity(this);
}
}
this.LoadProperty(listProperty, data);
return(data);
}
