Mysql 如何将其转换为LINQ

我想将此查询转换为LINQ

select sup.firstname, sup.lastname, sup.bankaccountnumber, tbl.total  from  (select nfcids_id, sum(purchasecost) as total
from tbl_milkpurchases
group by nfcids_id)   tbl inner join tbl_nfcids nfc on tbl.nfcids_id = nfc.id inner join tbl_suppliers sup on nfc.suppliers_id = sup.id

请尝试此查询

var obj= from a in Context.tbl_milkpurchases.GroupBy(x=>x.nfcids_id).Select(x=>new{x.nfcids_id,total=Sum(x.purchasecost)})
                 from b in Context.tbl_nfcids.where(x=>x.id==a.nfcids_id)
                 from c in Context.tbl_suppliers.where(x=>x.id==b.suppliers_id)
                 Select new{c.firstname, c.lastname, c.bankaccountnumber, a.total}

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要使用LINQ，必须将DBML连接到VS项目。此外，当您对数据库进行更改时，必须更新DBML，否则可能会出现意外错误。