如何使用 LINQ to SQL & C# 进行正确连接
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时间：2020-08-09 11:12:28 来源:igfitidea点击:
how to make a right join using LINQ to SQL & C#
提问by franko_camron
Hey guys I'm having a problem creating the following SQL Statement using LINQ & C#
嘿伙计们，我在使用 LINQ 和 C# 创建以下 SQL 语句时遇到问题
select c.IDAddenda, c.Descripcion
from CatAddendas c
right join EmpresaAddenda e on e.IDAddenda = c.IDAddenda
where e.rfc = 'SUL010720JN8'
order by c.IDAddenda asc
I got this
我懂了
public IEnumerable<CatAddenda> TraeAddendas(string rfc)
{
DataClasses1DataContext dc = new DataClasses1DataContext(...);
return (from adds in dc.EmpresaAddendas
cats.IDAddenda into joined
where adds.RFC == rfc
select adds.CatAddenda);
}
This is not doing a right join, so any ideas?
这不是正确的加入，所以有什么想法吗？
采纳答案by ionden
var RightJoin = from adds in dc.EmpresaAddendas
join cats in CatAddendas
on adds.IDAddenda equals cats.IDAddenda into joined
from cats in joined.DefaultIfEmpty()
select new
{
Id = cats.IDAddenda,
Description = cats.Descripcion
};
回答by Doguhan Uluca
var results = from e in EmpresaAddenda
join c in CatAddendas
on e.IDAddenda equals c.IDAddenda into f
from c in f.DefaultIfEmpty()
select new
{
ID = c.IDAddenda,
Description = c.Descripcion
};
You can apply where and order by on the results.
您可以在结果上应用 where 和 order by。
