LINQ到SQL本地化查询
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23-08-2019 - |
题
鉴于以下表格,我想返回给定文化的本地文本或给定文化不存在的默认文化的文本。
图http://lh4.ggpht.com/_gjscwav_czc/shw6hc-eozi/aaaaaaaaaaacby/mxabfiztby8/s400/diagram.png
因此,有了循环数据
资源
ID Name
1 Donkey
2 Elephant
局部
ID CultureID ResID LocaleText
1 1 1 Donkey
2 1 2 Elephant
3 2 1 baudet
我想能够归还法国文化的以下内容
baudet
elephant
我尝试了各种疑问,围绕左JON加入了我见过的样本,但我被卡住了。
var ct = from r in db.Resources
join lt in db.LocaleStrings
on r.ID equals lt.ResID into res
from x in res.DefaultIfEmpty()
select new
{
CultureID = x.CultureID,
LocaleText = x.LocaleText,
ResID = x.ResID
};
var text =
from c in db.Cultures
join t in ct
on c.ID equals t.CultureID into cults
from x in cults.DefaultIfEmpty()
select x;
解决方案
我敢肯定有更好的方法,但这似乎有效:
var ct =
from c in db.Cultures
from l in db.LocaleStrings
from r in db.Resources
where r.ID == l.ResID
select new
{
CultureID = c.ID,
LocaleText = l.CultureID == c.ID ? l.LocaleText : r.Name,
ResID = r.ID,
LSID = l.CultureID == c.ID ? l.ID : 0
};
var text =
from t in ct
where t.LSID != 0 || (t.LSID == 0 && !((from ac2 in ct
where ac2.LSID > 0 && ac2.CultureID == t.CultureID
select ac2.ResID).Contains(t.ResID)))
select new
{
CultureID = t.CultureID,
LocaleText = t.LocaleText,
ResID = t.ResID
};
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