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DateTime dt = new DateTime(1900, 1, 1);
var list = (from p in resarchData
join t in times
on p.workCls equals t.WorkCls into g
from r in g.DefaultIfEmpty()
select new
{
code = p.code,
workCls = p.workCls,
Item = p.Item,
sDate =r==null?dt : r.PJ_TIME_SDATE,
eDate = r==null?dt:r.PJ_TIME_EDATE,
comment = r==null?"":r.PJ_TIME_COMMENT,
pid = r==null?"":r.Pid
}
);