blocks|key|4798531|text|VB.NET版本|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|4798532|Dim+customerList+=+From+p+In+pers
+++++++++++++++++++Group+Join+l+In+list+On+
+++++++++++++++++++++p.persindex+Equals+l.persindex
+++++++++++++++++++Into+joineddata+=+Group,+
++++++++++++++++++++++++TotalOweight+=+Sum(p.weight)+
+++++++++++++++++++Select+p.persindex,+TotalOweight+|code-block|syntax|javascript|4798533|4798534|尝试：Linquer+SQL+to+LINQ+convertion+tool：|4798535|📷|atomic|4798536|​|4798537|from+p+in+pers+
joins+l+in+list+on++l.persindex+equals+p.persindex
group+by+new+{p.persindex,l.weight+}+into+grp
select+new+{+sum+=+grp.sum(x=>x.weight)}|4798538|entityMap|0|LINK|mutability|MUTABLE|url|http://www.sqltolinq.com/downloads|1|IMAGE|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/5cdc57733b9764dd084ba39de5668e59.png|imageAlt^0|0|8|0|0|0|3|Z|0|0|0|1|1|0|0|0^^$0|@$1|2|3|4|5|6|7|18|8|@$9|19|A|1A|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|1B|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|1C|8|@]|D|@]|E|$]]|$1|L|3|M|5|6|7|1D|8|@]|D|@$9|1E|A|1F|1|1G]]|E|$]]|$1|N|3|O|5|P|7|1H|8|@]|D|@$9|1I|A|1J|1|1K]]|E|$]]|$1|Q|3|R|5|6|7|1L|8|@]|D|@]|E|$]]|$1|S|3|T|5|H|7|1M|8|@]|D|@]|E|$I|J]]|$1|U|3|-4|5|6|7|1N|8|@]|D|@]|E|$]]]|V|$W|$5|X|Y|Z|E|$10|11]]|12|$5|13|Y|14|E|$15|16|17|-4]]]]

VB.NET version

<pre><code>Dim customerList = From p In pers
 Group Join l In list On 
 p.persindex Equals l.persindex
 Into joineddata = Group, 
 TotalOweight = Sum(p.weight) 
 Select p.persindex, TotalOweight 
</code></pre>

<hr>

Try : <a href="http://www.sqltolinq.com/downloads" rel="nofollow noreferrer">Linquer SQL to LINQ convertion tool</a> : <img src="https://i.stack.imgur.com/J3aBj.png" alt="enter image description here">

<pre><code>from p in pers 
joins l in list on l.persindex equals p.persindex
group by new {p.persindex,l.weight } into grp
select new { sum = grp.sum(x=&gt;x.weight)}
</code></pre>

blocks|key|676436|text|from+p+in+context.pers++
join+l+in+context.list+on+l.persindex+equals+p.persindex+
group+by+new+
{++++++p.persindex,
+++++++l.weight+
}+into+myGroup++
select+new()
{++++++Key+=+myGroup.Key,
+++++++GroupSum+=+myGroup.sum(x=>x.weight)
}++|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|676437|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>from p in context.pers 
join l in context.list on l.persindex equals p.persindex 
group by new 
{ p.persindex,
 l.weight 
} into myGroup 
select new()
{ Key = myGroup.Key,
 GroupSum = myGroup.sum(x=&gt;x.weight)
} 
</code></pre>

blocks|key|676521|text|我想这就是你需要的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|676522|public+int+CalcWeight(IEnumerable<Person>+pers,+IEnumerable<Person>+list)
{
++++return++
++++++++pers
++++++++.Join(list,+p=>p.PersIndex,+l=>l.PersIndex,+(p,+l)+=>+new+{p.PersIndex,+l.Weight})
++++++++.GroupBy(+a+=>+new+{a.PersIndex,+a.Weight})
++++++++.Sum(group=>group.Key.Weight);
}|code-block|syntax|javascript|676523|数据类Person如下所示：|676524|public+class+Person
{
++++public+int+PersIndex;
++++public+int+Weight;
}|676525|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

I guess that's what you need:

<pre><code>public int CalcWeight(IEnumerable&lt;Person&gt; pers, IEnumerable&lt;Person&gt; list)
{
 return 
 pers
 .Join(list, p=&gt;p.PersIndex, l=&gt;l.PersIndex, (p, l) =&gt; new {p.PersIndex, l.Weight})
 .GroupBy( a =&gt; new {a.PersIndex, a.Weight})
 .Sum(group=&gt;group.Key.Weight);
}
</code></pre>

Data class Person is decalerd like this:

<pre><code>public class Person
{
 public int PersIndex;
 public int Weight;
}
</code></pre>

Help in find the Linq equivalent on the below sql query:

<pre><code>select sum(weight) from (
select weight from pers p
join list l on l.persindex= p.persindex
group by p.persindex,weight) a
</code></pre>

Need Linq equivalent

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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有关在以下sql查询中查找Linq等效项的帮助：select sum(weight) from (select weight from pers pjoin list l on l.persindex= p.persindexgroup by  p.persindex,weight) a

问需要Linq等效项
EN

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