Group By in LINQ: how to store primary key in an column

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Hello All,

I am facing an prob please help.

I have following class.

C#

class Product
{
        public int ProdCode { get; set; }
        public decimal NetAmount { get; set; }
        public List<int> BillDetailIds { get; set; }
}

In db there are two tables:

Table 1: Master table : containing following columns
BillId (PK), BillDate
Table 2: Details Table: containing following columns
BillDetailId (PK), BillId (FK), ProdCode, NetAmount

I want to show list from details table group by with Prodcode with sum of its amount. so i did below

C#

var prodlist=Db.Details..GroupBy(x=>new{x.ProdCode}).select(x=>
                 new Product(){
                    ProdCode = Convert.ToInt32(x.FirstOrDefault().ProdCode),
                    NetAmount = x.Sum(s => s.Amount),
                    BillDetailIds=??? 
};

I'm stuck in BillDetailIds.
I need to store BillDetailIds on which groups is performed to create an Product object.

Help me please, thanks in advance

Posted 8-Aug-12 16:35pm

tanishtaman

Updated 8-Aug-12 16:40pm

Wes Aday

v2

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Tbone1983 · Accepted Answer · 2012-08-09T01:12:00

You could use this to resolve the problem:

C#

 var prodlist = Db.Details.GroupBy(x=>new {x.ProdCode}).Select(x=>new Product()
{
   ProdCode = Convert.ToInt32(x.FirstOrDefault().ProdCode),
   NetAmount = x.Sum(s => s.Amount),
   BillDetailIds = Db.Details.Where(
                 z=>z.ProdCode == x.FirstOrDefault().ProdCode)
                 .Select(z=>z.BillDetailId).ToList()
});

I hope this helps you

Kind regards