/// <summary>
/// 将一组实体对象的更改保存到库。不会更新实体的其他引用属性。
/// </summary>
/// <param name="entities">要保存的实体序列。</param>
public virtual void Save(IEnumerable <TEntity> entities)
{
var query = new QuerySet <TEntity>(Provider, null);
#if N35
query.BatchOperate(entities.Cast <IEntity>().Where(s => s.EntityState == EntityState.Attached), query.CreateInsertExpression());
query.BatchOperate(entities.Cast <IEntity>().Where(s => s.EntityState == EntityState.Modified), query.CreateUpdateExpression());
query.BatchOperate(entities.Cast <IEntity>().Where(s => s.EntityState == EntityState.Detached), query.CreateDeleteExpression(true));
#else
query.BatchOperate(entities.Where(s => s.EntityState == EntityState.Attached), query.CreateInsertExpression());
query.BatchOperate(entities.Where(s => s.EntityState == EntityState.Modified), query.CreateUpdateExpression());
query.BatchOperate(entities.Where(s => s.EntityState == EntityState.Detached), query.CreateDeleteExpression(true));
#endif
}