listarticlelist = articlerepository.getallarticle();
listuserlist = usersrepository.getallusers();
//使用者表左連線文章表
var usersleftjoin = (from u in userlist
join a in articlelist
on u.id equals a.author into users
from us in users.defaultifempty()
select new
).tolist();
//要避免這種寫法，這種寫法查出來的資料實際上相當於連線
var usersleftjoin1 = (from u in userlist
join a in articlelist
on u.id equals a.author into users
from us in users
select new
).tolist();
//文章表左連線使用者表
var articleleftjoin = (from a in articlelist
join u in userlist
on a.author equals u.id into users
from us in users.defaultifempty()
select new
).tolist();
//要避免這種寫法，這種寫法查出來的資料實際上相當於連線
var articleleftjoin1 = (from a in articlelist
join u in userlist
on a.author equals u.id into users
from us in users
select new
).tolist();
//使用者表連線文章表
var result = (from a in articlelist
from u in userlist
where a.author == u.id
select new
).tolist();
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