我有以下 LINQ 表达式。nvarchar
我想计算字段中数值的总和。我正在使用以下代码来执行此操作,但是当我尝试运行它时出现错误。
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();
错误描述:
LINQ to Entities 无法识别方法“Int32 Parse(System.String)”方法,并且该方法无法转换为存储表达式
我怎样才能解决这个问题并写出比这更好的代码?
我将代码更改为:
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();
但收到此错误: