求教LINQ如何左连接变右连接或者相反？

[兔子家族-二哥]

现场查询，SQL中 a inner join B inner join C right join D 要改成 left join D 就对了
Linq：

from a in LinqDBContext.wbCheckList
from b in LinqDBContext.site
from c in LinqDBContext.onlineFiresystem
from d in LinqDBContext.firesystype
join e1 in LinqDBContext.wbCheckInfo on new { siteid = a.siteid, wbCheckId=a.wbCheckId, tiSysType=d.tiSysType } equals new { e1.siteid,e1.wbCheckId,e1.tiSysType }
where a.siteid == b.siteid && b.orgid == orgid && b.siteid == c.siteid && c.tiSysType == d.tiSysType

select new
{
c.MaintenanceId,
d.tiSysType,
d.vSysdesc,
State = (from e in LinqDBContext.wbCheckInfo where a.siteid == e.siteid && a.wbCheckId == e.wbCheckId && e.tiSysType == d.tiSysType select e.tiSysType).Count() == 0 ? "未完成" : "已完成",
e1.wbCheckId,
e1.wbCheckResult,
e1.wbProblemRemaks,

e1.wbId,
e1.YnHanding,
e1.Handingimmediately,
e1.siteid,
PicUrl = from f in LinqDBContext.wbCheckPic where e1.wbCheckId == f.wbCheckId && e1.siteid == f.siteid && e1.tiSysType == f.tiSysType select URL + f.PicUrl

};


这查询出来得结果和 SQL 中 right join一样，那如何改成SQL left查询？

[exception92]

原来是没人回复，然你剩一半技术分。

[兔子家族-二哥]

引用 1 楼 duanzi_peng 的回复:

原来是没人回复，然你剩一半技术分。

我连分都没了。、。。。求救