EF 查询异常

[wrost]

DateReceive 的类型是 DateTime？
估计出错在这里

问题：该怎么写？

DateTime dt = inbox_One.DateReceive.Value;

next_Mail.inbox = db.Inbox.Include("Mail.RegisteredUsers").Include("RegisteredUsers").
Where(a =>  a.LoginName == loginName && a.DateReceive.Value  <= dt).OrderByDescending(a => a.DateReceive.Value).First();

[threenewbee]

a.LoginName == loginName && a.DateReceive.HasValue && a.DateReceive.Value <= dt