var conhistorylist = conhistorydata.groupby(g => g.personid);就是conhistorydata是乙個iqueryable型別；
var conhistorylist = conhistorydata.groupby(g => g.personid).select(g => g.orderby(c => c.addtime));對資料分組之後在根據每乙個分組內的某乙個元素排序。
var conhistorylist = conhistorydata.groupby(g => g.personid).select(g => g.orderby(c => c.addtime).firstordefault()).tolist();對資料分組之後在根據每乙個分組內的某乙個元素排序。排序之後在返回第乙個元素，然後組成乙個集合返回。這個實現的是根據分組取組內第乙個元素然後重新返回乙個元素列表。
var dd = conhistorydata.groupby(g =>g.personid);//獲取每個分組的鍵
foreach (var item indd)
}
var childdetaillistdata = new list();childdetaillist是乙個list集合。通過先分組materialcategory欄位，然後在在分組內根據materialnum欄位再次分組。var childdetaillistg = childdetaillist.groupby(b => b.materialcategory).select(g => g.groupby(b =>b.materialnum));
var childdetaillistdata = new list();和上面使用元素差不多就是遍歷層數var childdetaillistg = childdetaillist.groupby(b => b.materialcategory).select(g => g.groupby(b =>b.materialnum));
foreach (var item inchilddetaillistg)}}
var data = (from a inview codechilddata
join bj
inbjcostdata
on a.id equals bj.childid
into bj
from bje in
bj.defaultifempty()
join bjt
inbjrefunddata
on a.id equals bjt.childid
into bjt
from bjte in
bjt.defaultifempty()
//學平險
join xpx in
xpxcostdata
on a.id equals xpx.childid
into xpx
from xpxe in
xpx.defaultifempty()
join xpxt
inxpxrefunddata
on a.id equals xpxt.childid
into xpxt
from xpxte in
xpxt.defaultifempty()
//餐費
join cf in
cfcostdata
on a.id equals cf.childid
into cf
from cfe in
cf.defaultifempty()
join cft
incfrefunddata
on a.id equals cft.childid
into cft
from cfte in
cft.defaultifempty()
//自定義
join zdy in
zdycostdata
on a.id equals zdy.childid
into zdy
from zdye in
zdy.defaultifempty()
join zdyt
inzdyrefunddata
on a.id equals zdyt.childid
into zdyt
from zdyte in
zdyt.defaultifempty()
//休園
join xy in
xycostdata
on a.id equals xy.childid
into xy
from xye in
xy.defaultifempty()
join xyt
inxyrefunddata
on a.id equals xyt.childid
into xyt
from xyte in
xyt.defaultifempty()
//押金
join yj in
yjcostdata
on a.id equals yj.childid
into yj
from yje in
yj.defaultifempty()
join yjt
inyjrefunddata
on a.id equals yjt.childid
into yjt
from yjte in
yjt.defaultifempty()
select
newh_childstatistics
);
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