Question

When i use the below code to retrieve information, it shows an error..

var mails = from m in entity.mailboxes
            join p in entity.ordinary_user_profile_info on m.from_id equals p.user_id
            select new MailList
            {
                mid = m.m_id,
                mfrom = m.**from_id,** // Error occours here
                mfomname = p.username,
                msubject = m.subject
            };

Error is:

"int? mailbox.from_id "

Cannot implicitly convert type ‘int?’ to ‘int’. An explicit conversion exists (are you missing a cast?)

I have declared m_id and from_id as int in DB as well as in MailList class.

Answer 1

var mails = from m in entity.mailboxes
            join p in entity.ordinary_user_profile_info on m.from_id equals p.user_id
            select new MailList
            {
                mid = m.m_id,
                mfrom = m.from_id ?? 0,
                mfomname = p.username,
                msubject = m.subject
            };