Linq 查询示列

if (!string.IsNullOrEmpty(keyword)) {
                users = (users
                    .Join(context.Set<UserContact>(),
                        u => u.Id, c => c.Id, (u, c) => new { user = u, contact = c })
                    .Where(pair =>
                        pair.user.Username.Contains(keyword) ||
                        pair.user.Nickname.Contains(keyword) ||
                        pair.user.Remark.Contains(keyword) ||
                        pair.contact.Email.Contains(keyword) ||
                        pair.contact.QQ.Contains(keyword) ||
                        pair.contact.Wangwang.Contains(keyword) ||
                        pair.contact.Tel.Contains(keyword) ||
                        pair.contact.Mobile.Contains(keyword) ||
                        pair.contact.Realname.Contains(keyword) ||
                        pair.contact.Address.Contains(keyword))
                    .Select(pair => pair.user));
            }