所以我尝试从多个表中删除1个记录。但是,它不会删除任何内容吗?
我尝试删除UserId ==登录用户的Id的记录,以及GroupId == id是从多个表到GroupUser的链接给出的id(带有字段:UserId)和GroupId):
public IActionResult UnSubscribe(Int16 id)
{
if(User.GetUserId() != null)
{
GroupUser groupToDel = _MyContext.GroupUser.Where(g => g.GroupId == id).FirstOrDefault();
groupToDel.UserId+=User.GetUserId();
_MyContext.Entry(groupToDel).State = EntityState.Deleted;
_MyContext.SaveChanges();
return RedirectToAction("Index", "Group");
}
else
{
throw new Exception("There was an Error!");
}
}
答案 0 :(得分:0)
你认为这比我想象的要困难,你应该尝试这样做:
GroupUser groupToDel = _MyContext.GroupUser.Where(g => g.GroupId == groupid
&& g.UserId == userid).First();
_MyContext.GroupUser.Remove(groupToDel);
_MyContext.SaveChanges();