Linq to SQL在删除父级时删除子级及其关系

Question

The relationships in my case Photo -PhotoId PhotoGroupsMap - MapingId(PK), PhotoId(FK with Photo) PhotoShare - ShareId(PK),PhotoId(FK with Photo) PhotoGroupComment - MapingId (FK with PhotoGroupsMap)

And i am using LinqSql for deletion and i want to Delete a Photo Object and i used the code

  Photoset _item = (from item in dbContext.Photos
                              where ....
                              select item).SingleOrDefault();

            //remove all Photo Share Entries
            dbContext.PhotosetShareMaps.DeleteAllOnSubmit(_item.PhotoShareMaps);
           //remove all Photo Group entries
            dbContext.PhotoGroups.DeleteAllOnSubmit(_item.PhotoGroups);

But how can i delete all Comments Associated with Groups? Since in this case if am trying to Delet Some Photo which is in some groups and the group contains some comment row , i am getting error (Since i am not removeing comments ). How can i remove that ?

Answer 1

尝试级联删除“注释”，同时删除“组”。要获取有关级联删除的更多信息，请参考此链接