如何编写 linq 查询以排除某些记录？

Question

This is my LINQ

IList<string> ExceptList = new List<string>() { "045C388E96", "C9B735E166", "02860EB192", "2401016471" };

                var listusers = context.USER_INFO.Where(x => x.ACTIVATED
                                    && x.COMP.EQUIPMENT.Count(y => y.STATUS == (int)STATUSEQ.ACTIVE) > 0
                                    && (x.LAST_LOGIN < time) 
                                    && !ExceptList.Contains(x.COMP.CODE)
                                    && !x.IS_LOCK
                                    || !x.COMP.IS_LOCK)
                    .Select(x => new EmailOutOfDateLoginModel
                    {
                        COMPCode = x.COMP.CODE,
                        First_Name = x.FIRST_NAME,
                        Last_Name = x.LAST_NAME,
                        Total_EQ = x.COMP.EQUIPMENT.Count(y => y.STATUS == (int)STATUSEQ.ACTIVE),
                        User_Email = x.USER_EMAIL
                    }).ToList();

I am not sure why my ExceptList is not working. I want to exclude any record that contaisn any of the CODE in the ExceptList

Answer 1

Put parentheses around the expressions containing the && logic. The || at the end is only matched with the.x.IS_LOCK ||.x.COMP.IS_LOCK otherwise.

Answer 2

According your linq all records where (.x.COMP.IS_LOCK==true) will be included in the query: Try this "where" part:

.Where(x => x.ACTIVATED
&& x.COMP.EQUIPMENT.Count(y => y.STATUS == (int)STATUSEQ.ACTIVE) > 0
&& (x.LAST_LOGIN < time) 
&& !ExceptList.Contains(x.COMP.CODE) 
&& !(x.IS_LOCK && x.COMP.IS_LOCK))