Int.Parse in Linq Expression

Question

I have the following LINQ expression. I want calculate the sum of numeric values in an nvarchar field. I'm using following code to do this, but I get an error when I try to run this.

var m = new MaterialModelContainer();

var list = 
    (from x in
        (
            from inv in m.INVs
            join l in m.LIBs on inv.MESC equals l.MESC
            join o in m.OUTs on inv.MESC equals o.MESC
            join t in m.TRANs on inv.MESC equals t.MESC
            where t.TYPE == "60"
            select new
            {
                l.MESC,
                l.LINE_NO,
                l.UNIT_LINE,
                Description = l.DES + " " + l.PART_NO,
                inv.NEW_QTY,
                o.PJ,
                o.DATE,
                o.QTY,
                o.QTY_REC,
                TranQty = t.QTY,
                tranDate = t.DATE
            }
        )
        group x by
            new
            {
                x.MESC,
                x.LINE_NO,
                x.UNIT_LINE,
                x.Description,
                x.NEW_QTY,
                x.PJ,
                x.DATE,
                x.QTY,
                x.QTY_REC
            }
        into g
        select new
        {
            QTY_Consum_1 = g.Where(c => int.Parse(c.tranDate) >= cuDate && int.Parse(c.tranDate) <= endDate).Sum(d => int.Parse(d.TranQty))
        }
    ).ToList();

Error Description:

LINQ to Entities does not recognize the method 'Int32 Parse(System.String)' method, and this method cannot be translated into a store expression

How can I solve this problem and write this code better than this?

I changed the code to this:

select new
{
    QTY_Consum_1 = g.Where(c => SqlFunctions.StringConvert(c.tranDate) >= cuDate && SqlFunctions.StringConvert(c.tranDate) <= endDate).Sum(d => SqlFunctions.StringConvert(d.TranQty)),
   g.Key.MESC
}
).ToList();

but got this error:

Answer 1

You can't use int.parse in where. You can rewrite your query like this:

var list = (from x in
                (
                    from inv in m.INVs
                    join l in m.LIBs on inv.MESC equals l.MESC
                    join o in m.OUTs on inv.MESC equals o.MESC
                    join t in m.TRANs on inv.MESC equals t.MESC
                    where t.TYPE == "60" && t.QTY!=""
                    select new
                       {
                           l.MESC,
                           l.LINE_NO,
                           l.UNIT_LINE,
                           Description = l.DES + " " + l.PART_NO,
                           inv.NEW_QTY,
                           o.PJ,
                           o.DATE,
                           o.QTY,
                           o.QTY_REC,
                           TranQty = t.QTY,
                           tranDate = t.DATE

                      }
                ).ToList()
            group x by
                new
                    {
                        x.MESC,
                        x.LINE_NO,
                        x.UNIT_LINE,
                        x.Description,
                        x.NEW_QTY,
                        x.PJ,
                        x.DATE,
                        x.QTY,
                        x.QTY_REC
                    }
            into g
            select new
                {
                    QTY_Consum_1 = g.Where(c => int.Parse(c.tranDate) >= cuDate && int.Parse(c.tranDate) <= endDate).Sum(d => int.Parse(d.TranQty)),
                    g.Key.MESC
                }
           ).ToList();

Call .ToList() method, then use int.Parse(variable).

Have a nice day.