1.lamdba分組排序
foodBusinessDistrict.
GroupBy(x => new
{
x.CityLocationID,
x.CityLocationName,
x.BusinessDistrctID,
x.BusinessDistrctName
})
.Select(g=> new BusinessDistrictWithCountModel
{
CityLocationID = g.Key.CityLocationID,
CityLocationName = g.Key.CityLocationName,
BusinessDistrctID = g.Key.BusinessDistrctID,
BusinessDistrctName = g.Key.BusinessDistrctName,
ProductCount = g.Sum(a => a.ProductCount)
})
.OrderByDescending(x => x.ProductCount)
.ToList();
2.group分組
eg1.
var id = (from p in (from ps in GPEcontext.hbl_product_stock
group ps by new {ps.ProductID}
into G
select new
{
Key = G.Key,
Count = G.Count()
})
orderby p.Count descending
select p.Key.ProductID.Value).FirstOrDefault();
eg2.
DataTable dt = (from x in dsResult.Tables[0].AsEnumerable()
where DataTrans.CBoolean(x["IsChecked"]) == true
group x by new
{
no = x.Field<string>("NO"),
ptno = x.Field<string>("PTNO"),
ver = x.Field<int>("VER"),
kd = x.Field<string>("KD"),
que_da = Convert.ToDateTime(x.Field<DateTime>("QUE_DA").ToString("yyyy/MM/dd"))
} into g
orderby g.Key.no,g.Key.ptno,g.Key.ver,g.Key.kd,g.Key.que_da
select new
{
qty = g.Sum(x => Convert.ToInt32(x["QUE_QTY"])),
stock=g.Sum(x=>Convert.ToInt32(x["STOCK"])),
no=g.Key.no ,
ptno=g.Key.ptno,
ver=g.Key.ver,
kd=g.Key.kd,
que_da=g.Key.que_da
}).ConvertDataTable();
